Omega Fc 21 User Manual

Users Guide  
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FC-21  
Flow Computer  
99579 08/21/03  
CONTENTS  
1. DESCRIPTION  
1.1 Unit Description ...............................................................................................1  
1.2 Unit Features ...................................................................................................1  
1.3 Specifications ..................................................................................................2  
2. INSTALLATION  
2.1 General Mounting Hints...................................................................................6  
2.2 Mounting Diagrams .........................................................................................6  
3. APPLICATIONS  
3.1 Liquid Volume ..................................................................................................7  
3.2 Corrected Liquid Volume .................................................................................8  
3.3 Liquid Mass .....................................................................................................9  
3.4 Batching ........................................................................................................10  
4. WIRING  
4.1 Typical Batcher Wiring................................................................................... 11  
4.2 Typical Rate/Total Wiring ............................................................................... 11  
4.3 Wiring In Hazardous Areas............................................................................12  
5. UNIT OPERATION  
5.1 Front Panel Operation Concept for Run Mode..............................................13  
5.2 General Operation .........................................................................................14  
5.3 Ratemeter/Totalizer Operation ......................................................................14  
5.3.1 Password Protection for Rate/Total mode ......................................14  
5.3.2 Relay Operation in Rate/Total mode...............................................14  
5.3.3 Pulse Output in Rate/Total mode ....................................................14  
5.3.4 Analog Output in Rate/Total mode ..................................................14  
5.3.5 RS-232 Serial Port Operation in Rate/Total mode .........................15  
5.3.6 RS-485 Serial Port Operation in Rate/Total mode .........................15  
5.4 Batcher Operation .........................................................................................16  
5.4.1 Batcher Configuration .....................................................................16  
5.4.2 Password Protection for Batcher mode ..........................................17  
5.4.3 Relay Operation in Batcher mode ..................................................17  
5.4.4 Pulse Output in Batcher mode.......................................................17  
5.4.5 Analog Output in Batcher mode......................................................17  
5.4.6 RS-232 Serial Port Operation in Batcher mode.............................18  
5.4.7 RS-485 Serial Port Operation in Batcher mode.............................18  
6. PROGRAMMING  
6.1 Front Panel Operation Concept for Program Mode.......................................19  
6.2 EZ Setup .......................................................................................................20  
6.3 Setup Menus .................................................................................................21  
6.4 Setup Sub-Menus..........................................................................................22  
6.4.1 SELECT EZ SETUP .......................................................................22  
6.4.2 INSTRUMENT TYPE......................................................................22  
6.4.3 SELECT FLOW EQUATION...........................................................23  
6.4.4 SETUP INDICATORS (Total) ..........................................................23  
6.4.5 SETUP INDICATORS (Density) .....................................................23  
6.4.6 SETUP INDICATORS (Rate) ..........................................................24  
6.4.7 SETUP INDICATORS (Temperature) .............................................24  
6.4.8 SETUP FLOW INPUT (Pulse - Ain & PS (A=B)) ............................25  
6.4.9 SETUP FLOW INPUT (Pulse - Quadrature, Qx1 or Qx2) ..............26  
6.4.10 SETUP FLOW INPUT (Analog) ....................................................27  
6.4.11 SETUP AUX INPUT ......................................................................28  
6.4.12 SET FLUID PROPERTIES ...........................................................29  
6.4.13 SETUP PULSE OUTPUT .............................................................29  
6.4.14 SETUP ANALOG OUTPUT ..........................................................30  
6.4.15 SETUP RELAYS...........................................................................30  
6.4.16 SETUP CONTROL INPUTS(RATE/TOTAL) ................................ 32  
6.4.17 SETUP CONTROL INPUTS(BATCH)...........................................32  
6.4.18 SETUP REALTIME CLOCK(Time) ...............................................33  
6.4.19 SETUP REALTIME CLOCK(Date)................................................33  
6.4.20 SERIAL USAGE ...........................................................................34  
6.4.21 SET DATALOG/PRINT(Configure) ...............................................35  
6.4.22 SET DATALOG/PRINT (Select_list) .............................................36  
6.4.23 ADMINISTRATIVE SETUP ...........................................................36  
6.4.24 SETUP NETWORK CARD ...........................................................37  
99579 08/21/03  
i
CONTENTS  
7. PRINCIPLE OF OPERATION  
7.1 General..........................................................................................................38  
7.2 Orifice Flowmeter Considerations .................................................................38  
7.3 Flow Equations ..............................................................................................38  
7.4 Calculating the Expansion Factor..................................................................41  
7.5 Computation of Viscosity Coef. A and B ........................................................42  
7.6 Linearization Table ........................................................................................43  
7.6.1 Linearization Table General Information .........................................43  
7.6.2 Linearization Table for Pulse Inputs................................................43  
7.6.3 Linearization Table for Analog Inputs..............................................43  
7.6.4 Linearization Table Interpolation .....................................................43  
8. TEST, SERVICE and MAINTENANCE  
8.1 Test Menus ....................................................................................................44  
8.2 Test Sub-Menus ............................................................................................45  
8.2.1 Audit Trail ........................................................................................45  
8.2.2 Error History ...................................................................................45  
8.2.3 Print System Setup .........................................................................45  
8.2.4 Keypad test.....................................................................................46  
8.2.5 Display test .....................................................................................46  
8.2.6 Calibrate CH1 0mA.........................................................................47  
8.2.7 Calibrate CH1 20mA.......................................................................47  
8.2.8 Calibrate CH2 0mA.........................................................................48  
8.2.9 Calibrate CH2 20mA.......................................................................48  
8.2.10 Calibrate CH1 0V..........................................................................49  
8.2.11 Calibrate CH1 10V ........................................................................49  
8.2.12 Calibrate CH2 0V..........................................................................50  
8.2.13 Calibrate CH2 10V........................................................................50  
8.2.14 Calibrate 100 ohm RTD ................................................................50  
8.2.15 Calibrate 4mA Out ........................................................................51  
8.2.16 Calibrate 20mA Out ......................................................................51  
8.2.17 Analog In Test ...............................................................................51  
8.2.18 Pulse input test .............................................................................52  
8.2.19 Analog out test ..............................................................................52  
8.2.20 Excitation out test .........................................................................52  
8.2.21 Pulse out test ................................................................................53  
8.2.22 Relay test.....................................................................................53  
8.2.23 Control input test ..........................................................................53  
8.2.24 Battery Voltage test ......................................................................54  
8.2.25 Data logger utility ..........................................................................54  
8.3 Internal Fuse Replacement ...........................................................................55  
9. RS-232 SERIAL PORT  
9.1 RS-232 Serial Port Description .....................................................................56  
9.2 Instrument Setup by PC Over Serial Port......................................................56  
9.3 Operation of Serial Communication Port with Printers ..................................56  
9.4 FC-21 RS-232 Port Pinout ............................................................................56  
10. RS-485 SERIAL PORT  
10.1 RS-485 Serial Port Description ...................................................................57  
10.2 General........................................................................................................57  
10.3 Operation of Serial Communication Port with PC .......................................57  
10.4 FC-21 RS-485 Port Pinout ..........................................................................57  
11. FLOW COMPUTER SETUP SOFTWARE  
11.1 System Requirements .................................................................................58  
11.2 Cable and Wiring Requirements..................................................................58  
11.3 Installation for Windows™3.1 or 3.11 ..........................................................58  
11.4 Using the Flow Computer Setup Software ..................................................59  
11.5 File Tab ........................................................................................................59  
11.6 Setup Tab.....................................................................................................59  
11.7 View Tab ......................................................................................................60  
11.8 Misc. Tab......................................................................................................60  
12. GLOSSARY OF TERMS  
12 Glossary Of Terms..........................................................................................61  
13. DIAGNOSIS AND TROUBLESHOOTING  
13.1 Response of FC-21 on Error or Alarm: ........................................................65  
13.2 Diagnosis Flow Chart and Troubleshooting.................................................66  
13.3 Error & Warning Messages: ........................................................................67  
13.3.1 Sensor/Process Alarms ................................................................67  
13.3.2 Self Test Alarms ............................................................................68  
APPENDIX A  
Setup Menus .......................................................................................................69  
ii  
FC-21 Flow Computer  
Unit Description  
1. Description  
1.1 Unit Description:  
The FC-21 Flow Computer satisfies the instrument requirements for a  
variety of flowmeter types in liquid applications. Multiple flow equations  
and instrument functions are available in a single unit with many advanced  
features.  
The alphanumeric display shows measured and calculated parameters  
in easy to understand format. Single key direct access to measurements  
and display scrolling is supported.  
The versatility of the FC-21 permits a wide measure of versatility within  
the instrument package. The various hardware inputs and outputs can be  
“soft” assigned to meet a variety of common application needs. The user  
“soft selects” the usage of each input/output while configuring the  
instrument. Consider the following illustrative examples.  
The isolated analog output can be chosen to follow volume flow, corrected  
volume flow, mass flow, temperature, or density by means of a menu  
selection. Most hardware features are assignable by this method.  
The user can assign the standard RS-232 Serial Port for data logging,  
transaction printing, or for connection to a modem for remote meter  
reading.  
1.2 Unit Features:  
Unit Features  
The FC-21 Flow Computer offers the following features:  
• Custody Transfer with Audit Trail  
• Multiple Instrument Functions  
• Menu Selectable Hardware & Software Features  
• Two Line LCD or VFD Display  
• Foreign Language Options  
• Isolated Outputs Standard  
• Versatile RS-232 Port Standard  
• DIN Enclosure with Two Piece Connector  
• Optional Networking Cards  
• Advanced Batching Features  
1
FC-21 Flow Computer  
1.3 Specifications:  
Specifications:  
Pulse Inputs:  
Environmental  
Number of Flow Inputs: one  
Configurations supported: single input with or  
without quadrature (menu selectable)  
Input Impedance: 10 Knominal  
Pullup Resistance: 10 Kto 5 VDC (menu  
selectable)  
Indoor Use  
Altitude up to 2000m  
Operating Temperature: 0°C to +50°C  
(-20°C to 55°C optional)  
Storage Temperature: -40°C to +85 C  
Maximum Relative Humidity : 80% for temperatures  
up to 31°C decreasing linearly to 50% RH at  
40°C  
Mains supply voltage fluctuations not to exceed ±10%  
of the nominal voltage  
Pull Down Resistance: 10 Kto common  
Trigger Level: (menu selectable)  
High Level Input  
Logic On:  
Logic Off:  
3 to 30 VDC  
0 to 1 VDC  
Transient overvoltage according to INSTALLATION  
CATEGORY II (see UL 3101-1 Annex J)  
POLLUTION DEGREE 2 in accordance with  
IEC 664 (see 3.7.3)  
Low Level Input (mag pickup)  
Selectable sensitivity: 10 mV & 100 mV  
Minimum Count Speed: User selectable  
Maximum Count Speed: Selectable: 0 to 20kHz  
Overvoltage Protection: 50 VDC  
Materials: UL, CSA, VDE approved  
Fast Transient: Protected to 500 VDC  
(Capacitive Clamp)  
Approvals: CE Approved Light Industrial,  
UL File #: E192404  
CSA Pending  
Compensation Input  
The compensation input is menu selectable for  
temperature, density or not used.  
Display  
Type: 2 lines of 20 characters  
Types: Backlit LCD or VFD ordering options  
Character Size: 0.3" nominal  
User selectable label descriptors and units of  
measure  
Operation: Ratiometric  
Accuracy: 0.01% FS  
Thermal Drift: Less than 100 ppm/C  
Basic Measurement Resolution: 16 bit  
Update Rate: 1 update/sec minimum  
Automatic Fault detection:  
Signal Over-range/under-range  
Current Loop Broken  
Keypad  
Keypad Type: Membrane Keypad  
Keypad Rating: Sealed to Nema 4  
Number of keys: 16  
RTD short  
RTD open  
Enclosure  
Fault mode to user defined default settings  
Size: See Dimensions  
Depth behind panel: 6.5" including mating connector  
Type: DIN  
Materials: Plastic, UL94V-0, Flame retardant  
Bezel: Textured per matt finish  
Equipment Labels: Model, safety, and user wiring  
Transient Protection: 500 V (Capacitive Clamp)  
Reverse Polarity: No ill effects  
Over-Voltage Limit (Voltage Input): 50 VDC  
Available Input Ranges  
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC  
Current: 4-20 mA, 0-20 mA  
Power Input  
The factory equipped power option is internally fused.  
An internal line to line filter capacitor is provided for  
added transient suppression.  
Resistance: 100 Ohms DIN RTD  
100 Ohm DIN RTD (DIN 42-760, BS 1904):  
Three Wire Lead Compensation  
Internal RTD linearization learns ice point  
resistance  
Order Option 1: 110VAC: 85 to 127 Vrms, 50/60 Hz  
Order Option 2: 220VAC: 170 to 276 Vrms, 50/60 Hz  
Order Option 3: 12VDC: 10.5 to 14 VDC  
Order Option 4: 24VDC: 18 to 24 VDC  
1 mA Excitation current with reverse polarity  
protection  
Temperature Resolution: 0.01 C  
Flow Inputs:  
Analog Input:  
Ranges  
Control Inputs  
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC  
Current: 4-20 mA, 0-20 mA  
Basic Measurement Resolution: 16 bit  
Update Rate: 5 updates/sec minimum  
Automatic Fault detection: Signal over/under-range,  
Current Loop Broken  
Calibration: Self Calibration and Auto-zero  
Continuously  
Extended calibration: Learns Zero and Full Scale  
of each range using special test mode.  
Fault Protection:  
Switch Inputs are menu selectable for Start, Stop,  
Reset, Lock, Inhibit, Alarm Acknowledge, Print  
or Not Used.  
Control Input Specifications  
Input Scan Rate: 10 scans per second  
Logic 1: 4 - 30 VDC  
Logic 0: 0 - 0.8 VDC  
Transient Suppression: 500 V fast transient  
(Capacitive Clamp)  
Input Impedance: 100 KΩ  
Control Activation: Positive Edge or Pos. Level  
based on product definition  
Fast Transient: 500 V Protection  
(Capacitive Clamp)  
Reverse Polarity: No ill effects  
Over-Voltage Limit: 50 VDC Over voltage  
protection  
Excitation Voltage  
110/220 VAC Powered Units  
Menu Selectable: 5, 12 or 24 VDC @ 100mA  
24 VDC Powered Units  
Over-Current Protection: Internally current  
limited Protected to 24 VDC.  
Menu Selectable: 5 or 12 VDC @ 100mA  
12 VDC Powered Units  
5 VDC @ 100mA  
2
FC-21 Flow Computer  
Relay Outputs  
Operating Mode  
The relay outputs are menu assignable to  
(Individually for each relay) Low Rate Alarm, Hi  
Rate Alarm, Prewarn Alarm, Preset Alarm, Pulse  
Output (pulse options) or General purpose warning  
(security).  
The Flow Computer can be thought of as making a  
series of measurements of flow, temperature/  
density sensors and then performing calculations  
to arrive at a result(s) which is then updated  
periodically on the display. The analog output, the  
pulse output, and the alarm relays are also updated.  
The cycle then repeats itself.  
Number of relays: 2 (4 optional)  
Contact Style: Form C contacts  
Contact Ratings: 250 VAC @ 5 amps  
30 VDC @ 5 amps  
Step 1:Update the measurements of input signals-  
Raw Input Measurements are made at each input  
using equations based on input signal type selected.  
The system notes the “out of range” input signal as  
an alarm condition.  
Fast Transient Threshold: 1000 V  
Serial Communication  
The serial port can be used for printing, datalogging,  
modem connection and communication with a Step 2:Compute the Flowing Fluid Parameters-  
computer.  
RS-232:  
The temperature, viscosity, and density equations  
are computed as needed based on the flow  
equation and input usage selected by the user.  
Device ID: 01-99  
Baud Rates: 300, 600, 1200, 2400, 4800, 9600,  
19200  
Step 3 : Compute the Volumetric Flow-  
Parity: None, Odd, Even  
Uncompensated flow is the term given to the flow  
in volume units. The value is computed based on  
the flowmeter input type selected and augmented  
by any performance enhancing linearization that  
has been specified by the user.  
Handshaking: None, Software, Hardware  
Print Setup: Configurable print list and formatting  
RS-485:  
Device ID: 01-247  
Baud Rates: 300, 600, 1200, 2400, 4800, 9600,  
19200  
Step 4: Compute the Corrected Volume Flow at  
Reference Conditions-  
Parity: None, Odd, Even  
Protocol: Modbus RTU (Half Duplex)  
In the case of a corrected liquid volume flow  
calculation, the corrected volume flow is computed  
as required by the selected compensation equation.  
Analog Output  
The analog output is menu assignable to  
correspond to the Uncompensated Volume Rate, Step 5 : Compute the Mass Flow-  
Corrected Volume Rate, Mass Rate, Temperature,  
Density, Volume Total, Corrected Volume Total or  
Mass Total.  
Type: Isolated Current Sourcing  
Isolated I/P/C: 500 V  
Available Ranges: 4-20 mA, 0-20 mA  
Resolution: 12 bit  
Accuracy: 0.05% FS at 20 Degrees C  
Update Rate: 1 update/sec minimum  
Temperature Drift: Less than 200 ppm/C  
Maximum Load: 1000 ohms (at nominal line Step 7: Compute the Analog Output-  
voltage)  
Compliance Effect: Less than .05% Span  
60 Hz rejection: 40 dB minimum  
EMI: No effect at 3 V/M  
Calibration: Operator assisted Learn Mode  
Averaging:User entry of DSP Averaging constant  
to cause an smooth control action.  
All required information is now available to compute  
the mass flow rate as volume flow times density.  
Step 6: Check Flow Alarms-  
The flow alarm functions have been assigned to  
one of the above flow rates during the setup of the  
instrument. A comparison is now made by  
comparing the current flow rates against the  
specified hi and low limits.  
This designated flow rate value is now used to  
compute the analog output.  
Step 8: Compute the Flow Totals by Summation-  
A flow total increment is computed for each flow  
rate. This increment is computed by multiplying the  
respective flow rate by a time base scaler and then  
summing. The totalizer format also includes  
provisions for total rollover.  
Isolated Pulse output  
The isolated pulse output is menu assignable to  
Uncompensated Volume Total, Compensated Step 9: Total Preset Comparisons-  
Volume Total or Mass Total.  
Isolation I/O/P: 500 V  
The total associated with a preset function is then  
compared against the corresponding preset value  
and any required control actions taken.  
Pulse Output Form: Open Collector  
Maximum On Current: 125 mA  
Maximum Off Voltage: 30 VDC  
Saturation Voltage: 1.0 VDC  
Maximum Off Current: 0.1 mA  
Pulse Duration: User selectable  
Pulse output buffer: 8 bit  
Step 10: Pulse Output Service-  
The pulse output is next updated by scaling the  
total increment which has just been determined by  
the pulse output scaler and summing it to any  
residual pulse output amount.  
Pulse Rate Averaging: Standard  
Fault Protection  
Step 11: Update Display and Printer Output-  
The instrument finally runs a task to update the  
various table entries associated with the front panel  
display and serial outputs.  
Reverse polarity: Shunt Diode  
Transient Protection: 500 VDC  
(Capacitive Clamp)  
3
FC-21 Flow Computer  
Setup Mode  
Maintenance Mode:  
The setup mode is password protected by means of  
a numeric lock out code established by the user. In  
addition, a secret, manufacturers numeric unlock  
entry sequence is available.  
The Maintenance Mode of the FC-21 is the Test  
and Calibration Mode for the device. This mode  
provides a number of specialized utilities required  
for factory calibration, instrument checkout on start-  
up, and periodic calibration documentation.  
The system also provides a minimum implementation  
of an “audit trail” which tracks significant setup  
changes to the unit. This feature is increasingly being  
found of benefit to users or simply required by  
Weights and Measurement Officials in systems used  
in commerce, trade, or “custody transfer” applications.  
A password is required to gain access to this  
specialized mode of operation. Normally quality,  
calibration, and maintenance personnel will find  
this mode of operation very useful. It is also useful  
for factory testing.  
A Worksheet is provided to assist the user in setting  
up the instrument. In addition, a software program is  
available which runs on a PC using a RS-232 Serial  
for connection to the Flow Computer. Illustrative  
examples may be down loaded in this manner.  
Many of these tests may be used during start-up  
of a new system. Inputs signals may be read, and  
output signals may be exercised to verify the  
electrical interconnects before the entire system  
is put on line.  
The setup mode has numerous subgrouping of  
parameters needed for flow calculations. There is a  
well conceived hierarchy to the setup parameter list.  
Selections made at the beginning of the setup affect  
offerings further down in the lists.  
The following action items may be performed in  
the Maintenance Mode:  
Print Calibration/Maintenance Report  
Examine Audit Trail  
Perform Keypad Checkout  
Perform Display Checkout  
Perform Pulse Input Checkout  
Perform Pulse Output Checkout  
Perform Control Input Checkout  
Perform Relay Output Checkout  
Perform Analog Input Checkout  
Perform Analog Output Checkout  
Calibrate Analog Inputs using the Learn Feature  
Calibrate Analog Output using the Learn Feature  
Battery Check  
In the setup mode, the flow computer activates the  
correct setup variables based on the instrument  
configuration, the flow equation, and the hardware  
selections made for the compensation transmitter  
type, the flow transmitter type, and meter  
enhancements (linearization) options selected. All  
required setup parameters are enabled. All setup  
parameters not required are suppressed.  
A help line prompt is provided for each entry. In  
addition a help message is available which may be  
accessed by depressing the “HELP” key.  
Note that a calibration of the analog input/output  
will advance the audit trail counters since it effects  
the accuracy of the system.  
In the setup mode selections, several parameters  
are required to be input by the operator since these  
parameters are blank when the unit is received. The RS-232 Serial Port  
user will be prompted for these necessary values for  
his application. A blank parameter will prevent the  
user from entering the run mode and a suitable  
warning message will be issued.  
The FC-21 has a general purpose RS-232 Port  
which may be used for any one of the following  
purposes:  
Transaction Printing  
Also note that in the setup mode are parameter  
selections which have preassigned industry standard  
values. The unit will assume these values unless  
they are modified by the user.  
Data Logging Internal Datalog Dumps  
Remote Metering by Modem (optional)  
Computer Communication Link  
Configuration by Computer  
Print System Setup  
Most of the process input variables have available a  
“default” or emergency value which must be entered.  
These are the values that the unit assumes when a  
malfunction is determined to have occurred on the Instrument Setup by PC’s over Serial Port  
corresponding input.  
Print Calibration/Malfunction History  
Remote Control  
A Diskette program is provided with the FC-21  
that enables the user to rapidly configure the FC-  
21 using an Personnel Computer. Included on the  
diskette are common instrument applications which  
may be used as a starting point for your application.  
This permits the user to have an excellent starting  
point and helps speed the user through the  
instrument setup.  
It is possible to enter in a nominal constant value for  
temperature or density, or analog flow inputs by  
placing the desired nominal value into both the lo  
and hi values. This is also a convenience when  
performing bench top tests without simulators.  
4
FC-21 Flow Computer  
Operation of Serial Communication Port with  
Printers  
Operation of Serial Port with Modems (optional)  
The FC-21 RS-232 channel supports a number of  
operating modes. One of these modes is intended  
to support operation with a modem in remote  
metering applications. FC-21’s role is that of DTE  
effecting file transfers under common file transfer  
protocols.  
FC-21’s RS-232 channel supports a number of  
operating modes. One of these modes is intended  
to support operation with a printer in metering  
applications requiring transaction printing, data  
logging and/or printing of calibration and  
maintenance reports.  
An external modem is intentionally being used with  
the FC-21. This permits use with the variety of  
modem standards worldwide while avoiding the  
specialized approvals required for equipment that  
is deemed to fall under the category of  
telecommunication equipment.  
For transaction printing, the user defines the items  
to be included in the printed document. The user  
can also select what initiates the transaction print  
generated as part of the setup of the instrument.  
The transaction document may be initiated via a  
front panel key depression, a remote contact  
closure, or upon completion of a batch.  
In the modem mode, the FC-21 is assumed to be  
operating in a remote metering role. The FC-21 will  
support key items in the Hayes Compatible “AT”  
Command Set. In this role, the FC-21 will have the  
following special abilities:  
0. Monitor the modem status as a task of the system  
1. Instruct the modem to answer an incoming call  
ATA  
In data logging, the user defines the items to be  
included in each data log as a print list. The user  
can also select when or how often he wishes a  
data log to be made. This is done during the  
setup of the instrument as either a time of day or  
as a time interval between logging.  
2. Respond to the calling modem at a compatible  
baud rate and protocol  
The system setup and maintenance report lists  
all the instrument setup parameters and usage  
for the current instrument configuration. In  
addition, the Audit trail information is presented  
along with a status report listing any observed  
malfunctions which have not been corrected.  
3. Perform error checking in conjunction with the  
modem  
4. Monitor the status of the carrier  
5. Terminate the telephone connection in event the  
connection is lost.  
The user initiates the printing of this report at a  
designated point in the menu by pressing the  
print key on the front panel.  
In addition, the FC-21 will be capable of initiating a  
call to a designed telephone number in the event of  
a metering malfunction.  
5
FC-21 Flow Computer  
2. Installation  
2.1 General Mounting Hints:  
General Mounting  
Hints  
The FC-21 Flow Computer should be located in an area with a clean, dry  
atmosphere which is relatively free of shock and vibration. The unit is  
installed in a 5.43" (138mm) wide by 2.68" (68mm) high panel cutout.  
(see Mounting Dimensions) To mount the Flow Computer, proceed as  
follows:  
a. Prepare the panel opening.  
Mounting Procedure  
b. Slide the unit through the panel cutout until the it touches the panel.  
c. Install the screws (provided) in the mounting bracket and slip the  
bracket over the rear of the case until it snaps in place.  
d. Tighten the screws firmly to attach the bezel to the panel. 3 in. lb. of  
torque must be applied and the bezel must be parallel to the panel.  
Termination Connectors:  
Minimum Wire Gauge:  
Maximum Wire Gauge:  
22 AWG  
14 AWG  
Voltage/current limits are limited by unit specifications.  
Permanently Connected Equipment:  
UL 3101-1, Section 6.12.2.1 specifies that:  
• A switch or circuit breaker shall be included in the building  
installation;  
• It shall be in close proximity to the equipment and within easy  
reach of the OPERATOR;  
• It shall be marked as the disconnecting device for the equipment.  
Ensure that the switch or circuit breaker chosen is suitable for the  
power requirements of the unit.  
2.2 Mounting Diagrams:  
Standard Mounting  
Bezel Kit Mounting  
FC-21  
Bezel Adaptor  
Gasket  
FC-21  
Mounting Bracket  
Mounting Bracket  
Dimensions  
6.15  
5.67 (144)  
5.43  
(138)  
(156)  
0.5  
(13)  
0.28 (7.2)  
RATE  
TOTAL  
147.43 GPM  
GAL  
267395.749  
Panel  
Cutout  
3.43  
(87)  
2.83  
(72)  
2.68  
(68)  
TOTAL  
1
RATE  
2
PRE  
3
1
2
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
GRAND  
6
SCROLL  
7
PRE  
8
DENS  
9
TIME  
HELP  
ENTER  
0
0.4 (10)  
Dotted Line Shows Optional Bezel Kit  
6.18  
Dimensions are in inches (mm)  
6
FC-21 Flow Computer  
3. Applications  
3.1 Liquid Volume  
Measurements:  
Liquid Volume  
A flowmeter measures the actual volume in a liquid line. A temperature  
sensor can also be installed to correct for liquid thermal expansion (see  
3.2 Corrected Volume).  
Calculations:  
• For Flowmeters with Pulse Outputs, Volume flow is calculated using  
the flowmeter frequency output and the user entered K-Factor.  
• For Flowmeters with Analog Transmitters, Volume flow is calculated  
using the measured flowmeter signal and the user entered scale settings.  
Output Results:  
• Display Results  
Flow Rate, Resettable Total, Non-Resettable Total  
• Analog Output  
Rate or Total  
• Pulse Output  
Total  
• Relay Outputs  
Rate or Total Alarms  
Applications:  
The Flow Computer can monitor actual volume flow and total of any  
liquid. Flow alarms are provided via relays and datalogging is available  
via analog (4-20mA) and serial outputs.  
Liquid Volume  
Illustration  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
0
Flowmeter  
Calculations  
Pulse Input; Average K-Factor  
input frequency * time scale factor  
K-Factor  
Volume Flow =  
Analog Input; Linear  
Volume Flow = % input * Full Scale Flow  
7
FC-21 Flow Computer  
Corrected  
3.2 Corrected Liquid Volume  
Liquid Volume  
Measurements:  
A flowmeter measures the actual volume in a liquid line. A temperature  
sensor is installed to correct for liquid thermal expansion.  
Calculations:  
• Corrected Volume is calculated using the flow and temperature inputs  
as well as the thermal expansion coefficient stored in the flow computer.  
Use the "SET FLUID PROPERTIES" submenu to define reference  
temperature and density values for standard conditions.  
Output Results:  
• Display Results  
Flow Rate, Resettable Total, Non-Resettable Total, Temperature,  
Density  
• Analog Output  
Rate, Total, Temperature or Density  
• Pulse Output  
Total  
• Relay Outputs  
Rate , Total or Temperature Alarms  
Applications:  
Monitoring corrected volume flow and total of any liquid. Flow alarms are  
provided via relays and datalogging is available via analog (4-20mA) and  
serial outputs.  
Corrected  
Liquid Volume  
Illustration  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
0
Flowmeter  
Temperature Transmitter  
Calculations  
Volume Flow  
As calculated in section 3.1  
Corrected Volume Flow (Temp. Transmitter)  
Corrected Volume Flow = vol. flow * (1 - Therm.Exp.Coef. *(Tf-Tref))2  
8
FC-21 Flow Computer  
Liquid Mass  
3.3 Liquid Mass  
Measurements:  
Actual volume is measured by the flow element (DP transmitter,  
Flowmeter). Temperature is measured by the temperature transmitter. A  
density transmitter can be used for direct density measurements.  
Calculations:  
• The density and mass flow are calculated using the reference density  
and the thermal expansion coefficient of the liquid (see "SET FLUID  
PROPERTIES" submenu)  
Output Results:  
• Display Results  
Flow Rate, Resettable Total, Non-Resettable Total, Temperature,  
Density  
• Analog Output  
Rate, Total, Temperature or Density  
• Pulse Output  
Total  
• Relay Outputs  
Rate, Total or Temperature Alarms  
Applications:  
Monitoring mass flow and total of any liquid. Flow alarms are provided via  
relays and datalogging is available via analog (4-20mA) and serial outputs.  
Liquid Mass  
Illustration  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
CLEAR  
MENU  
START  
STOP  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
ENTER  
0
0
Flowmeter  
Temp./Dens.  
Transmitter  
Orifice Plate  
with DP Transmitter  
Temp./Dens.  
Transmitter  
Volume Flow  
As calculated in section 3.1  
Mass Flow  
Calculations  
Mass Flow = volume flow * density  
9
FC-21 Flow Computer  
Batching  
3.4 Batching  
Measurements:  
A flowmeter measures the actual volume in a liquid line. A temperature  
sensor can also be installed to correct for liquid thermal expansion (see  
3.2 Corrected Volume).  
Calculations:  
• For Flowmeters with Pulse Outputs, Volume flow is calculated using  
the flowmeter frequency output and the user entered K-Factor.  
• For Flowmeters with Analog Transmitters, Volume flow is calculated  
using the measured flowmeter signal and the user entered scale settings.  
• Corrected Volume is calculated using the flow and temperature inputs  
as well as the thermal expansion coefficient stored in the flow computer.  
Output Results:  
• Display Results  
Flow Rate, Batch Total, Non-Resettable Total, Temperature, Density  
• Analog Output  
Rate, Total, Temperature or Density  
• Pulse Output  
Total  
• Relay Outputs  
Batch Total, Rate, or Temperature Alarms  
Applications:  
Batching and monitoring flow and total of any liquid. Batching is  
accomplished via relays and datalogging is available via analog (4-  
20mA) and serial outputs.  
Batching Illustration  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
0
Flowmeter  
Temperature Transmitter  
(Optional)  
Solenoid Valve  
Calculations  
Volume Flow  
As calculated in section 3.1  
Corrected Volume Flow (Temp. Transmitter)  
Corrected Vol. Flow = volume flow * (1 - Therm.Exp.Coef. *(Tf-Tref))2  
10  
FC-21 Flow Computer  
4 WIRING  
4.1 Typical Batcher Wiring:  
Batcher  
Wiring  
(+) V  
Signal  
1
2
3
4
5
6
7
8
9
DC OUTPUT  
PULSE IN 1  
PULSE IN 2  
COMMON  
---------  
FLOW  
Vin +  
IN  
Iin +  
Common  
Vin +  
FLOW SENSOR  
RTD EXCIT +  
RTD SENS  
RTD SENS -  
COMP  
+
IN  
Iin +  
Stop  
Start  
CNTR IN 1  
10 CNTR IN 2  
11 CNTR IN 3  
12 COMMON  
SEE USER  
MANUAL  
13 PULSE OUTPUT +  
14 PULSE OUTPUT -  
123456  
15  
Remote Counter  
115 VAC  
ANALOG OUTPUT +  
4-20 mA  
16 ANALOG OUTPUT -  
MOV  
recommended  
17 NC  
18 COM RLY1  
19 NO  
25  
26  
27  
28  
29  
30  
NC  
COM RLY3  
NO  
20 NC  
21 COM RLY2  
22 NO  
NC  
COM RLY4  
NO  
115 VAC  
SOLENOID VALVE  
23 AC LINE  
24 AC LINE  
DC +  
DC -  
115 VAC  
POWER IN  
4.2 Typical Rate/Total Wiring:  
Rate / Total  
Wiring  
(+) V  
Signal  
1
2
3
4
5
6
7
8
9
DC OUTPUT  
PULSE IN 1  
PULSE IN 2  
COMMON  
---------  
FLOW  
Vin +  
Iin +  
IN  
Common  
Vin +  
Iin +  
FLOW SENSOR  
RTD EXCIT +  
RTD SENS  
RTD SENS -  
COMP  
IN  
+
100 Ohm  
DIN RTD  
CNTR IN 1  
10 CNTR IN 2  
11 CNTR IN 3  
12 COMMON  
SEE USER  
MANUAL  
123456  
13 PULSE OUTPUT +  
14 PULSE OUTPUT -  
Remote Counter  
STRIP CHART  
RECORDER  
15  
ANALOG OUTPUT +  
+
4-20 mA  
16 ANALOG OUTPUT -  
-
17 NC  
18 COM RLY1  
19 NO  
25  
26  
27  
28  
29  
30  
NC  
COM RLY3  
NO  
Alarm Relay 1  
{
{
20 NC  
21 COM RLY2  
22 NO  
NC  
COM RLY4  
NO  
Alarm Relay 2  
115 VAC  
23 AC LINE  
24 AC LINE  
DC +  
DC -  
POWER IN  
11  
FC-21 Flow Computer  
4.3 Wiring In Hazardous Areas:  
Examples using MLT787S+ Barrier (MTL4755ac for RTD)  
Flow Input  
Flow Input  
Hazardous Area  
Safe Area  
+
4-20  
Q/P  
4-20mA Flow  
Transmitter  
1
2
3
4
24V Out  
28V  
Diode  
4-20mA In  
Common  
Temperature Input  
(4-20mA Transmitter)  
Temperature Input (4-20mA Transmitter)  
Hazardous Area  
Safe Area  
24V Out  
Common  
1
4
8
+
4-20mA Temp.  
Transmitter  
4-20  
28V  
4-20mA In  
Diode  
T
Temperature Input (RTD)  
Temperature Input  
(RTD)  
Hazardous Area  
Safe Area  
4
5
6
7
8
Common  
3-Wire RTD  
RTD Excite (+)  
RTD Sense (+)  
RTD Sense (–)  
12  
FC-21 Flow Computer  
5. UNIT OPERATION  
5.1 Front Panel Operation Concept for Run Mode  
The FC-21 is fully programmable through the front panel. Please review the  
following usage summary before attempting to use the instrument.  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
0
How To Use  
On-Line Help  
HELP  
On-line help is provided to assist the operator in using this product. The help is  
available during RUN and SETUP modes simply by pressing the HELP key. The  
HELP key is used to enter decimals when entering numeric values.  
How To Use  
Function Keys  
FUNCTION KEYS  
In the RUN mode, several keys have a special, direct access feature, to display  
an item of interest (i.e. RATE, TOTAL, PRE 1, etc.). Press the key to view your  
choice. Press the SCROLL key to return to scrolling display.  
How To Clear The  
Totalizer  
CLEARING TOTALIZER  
To clear the total, you must press the TOTAL Function Key 3 times. You will be  
asked to verify this action. The operator will be prompted to enter password if the  
unit is locked.  
NOTE: In the Batcher Mode, simply press the CLEAR key to reset the total (the  
batcher must be stopped or finished batching). It is not necessary to press  
the TOTAL Function Key first.  
How To Clear The  
Grand Total  
CLEARING GRAND TOTAL  
To clear the grand total, you must press the GRAND Function Key 3 times. You  
will be asked to verify this action. The supervisor will be prompted to enter the  
supervisor password if the unit is locked.  
How To Enter  
Presets  
PRESET KEYS  
In the RUN mode, PRE 1 & PRE 2 keys are used to view and/or change the preset  
setpoints. To view the Presets, simply press the desired Preset key. Rapidly  
press the Preset keys 3 times, then press the Clear key for direct editing of the  
preset setpoints.  
How To Create a  
Scroll List  
SCROLL  
Rapidly press the Scroll key twice to setup a display list.  
Press the CLEAR key to remove old scroll list.  
Press the function key for the item you wish to add  
Use the ∆ ∇ keys to assign the line.  
How To Use  
The Print Key  
PRINT  
The PRINT key is used to print on demand. When the PRINT key is pressed, a  
user defined list of data (TOTAL, RATE, PRE 1, etc.) is sent to the RS-232 port. A  
timed message of "PRINTING" will be displayed to acknowledge the print request.  
How To Use  
Special Batching  
Keys  
SPECIAL BATCHING KEYS  
The START and STOP keys are used only when batching to start and stop  
batches. The CLEAR key will clear the total without first pressing the TOTAL key  
(unit must be stopped). All other keys work the same in both Rate/Total mode and  
Batch mode. The Start and Stop keys operation are set by the control input  
settings. The Start options are: START or RESET/START. The Stop options are:  
STOP or STOP/RESET.  
How To Use  
The Menu Key  
MENU KEY  
The MENU key is used to enter the Setup and Test modes. Press the MENU key  
to enter the Setup and Test modes. (See section 6 for Setup mode, section 8 for  
Test mode). The MENU key is used as "escape" in Setup and Test Programming.  
Pressing the MENU key wile programming in the Sub-Menu groups will backup the  
display to that Sub-Menu group heading. Pressing the MENU key while viewing  
the Sub-Menu groups will backup the display to the Top Level Menu.  
How To  
Acknowledge Alarms  
ACKNOWLEDGING ALARMS  
Most alarm messages are self-clearing. Press the ENTER key to acknowledge  
and clear alarms.  
NOTE: Some keys and functions are password protected. Enter the password to  
gain access. The passwords are factory set as follows:  
Operator = 0  
Supervisor = 2000  
13  
FC-21 Flow Computer  
General  
5.2 General Operation  
Operation  
The unit can display: Rate, Total, Grand Total, Temperature, Density, Presets  
and Time of Day. The Temperature and/or Density can be displayed even if  
you are using the Volumetric Flow Equation (a Temperature or Density sensor  
must be installed). The unit can perform Mass or Corrected Volume equations  
using a temperature or density sensor (these equations can be computed  
without Temp/Dens sensors by using user defined default values). The unit can  
be programmed to perform Ratemeter/Totalizer or Batching functions (see  
section 6.3, SELECT INSTRUMENT Submenu).  
Rate/Total  
Operation  
5.3 Ratemeter/Totalizer Operation  
The Ratemeter/Totalizer mode is used primarily to monitor flowrate and  
accumulated total. The relays can be used to trigger flow, total, temperature or  
density alarms.  
Password Protection  
5.3.1 Password Protection for Rate/Total mode  
(Rate/Total mode)  
After an Operator and/or Supervisor Password is entered in the setup mode  
(see section 6.3, SETUP PASSWORD submenu), the unit will be locked. The  
unit will prompt the user for the password when trying to perform the following  
functions:  
Clear Total  
Clear Grand Total  
Enter Menu  
Edit Preset 1 (PRE 1 Key)  
Edit Preset 2 (PRE 2 Key)  
The Supervisor password should be reserved for supervisors. The Supervisor  
password will allow access to restricted areas of the Setup and Test menus.  
Relay Operation  
5.3.2 Relay Operation in Rate/Total mode  
(Rate/Total mode)  
Up to four relays are available (two standard) for alarm outputs. The relays can  
be assigned to trip according to rate, total, temperature, density readings or  
general system alarms. The relays can be programmed for low or high alarms.  
Preset 1 (RLY1) and Preset 2 (RLY2) are easily accessible by pressing the  
PRE 1 or PRE 2 key on the front panel. Preset 3 and Preset 4 are accessible  
only through the setup menu.  
Pulse Output  
(Rate/Total mode)  
5.3.3 Pulse Output in Rate/Total mode  
The isolated pulse output (open collector) is menu assignable to Volume Total,  
Corrected Volume Total or Mass Total. The pulse output duration can be set for  
10mS (50 Hz max) or 100mS (5 Hz max). A pulse output scale factor (pulse  
value) can be set to scale the pulse output. The pulse output is ideal for  
connecting to remote totalizers or other devices such as a PLC. See section  
1.3 for electrical specifications.  
Analog Output  
(Rate/Total mode)  
5.3.4 Analog Output in Rate/Total mode  
The analog output is menu assignable to correspond to the Volume Rate,  
Corrected Volume Rate, Mass Rate, Temperature, Density, Volume Total,  
Corrected Volume Total or Mass Total. The analog output is ideal for "trend"  
tracking using strip chart recorders or other devices.  
14  
FC-21 Flow Computer  
RS-232 Serial Port  
5.3.5 RS-232 Serial Port Operation in Rate/Total mode  
(Rate/Total mode)  
The RS-232 serial port can be used for programming (using the Setup Disk)  
or for communicating to printers and computers in the Operating Mode (Run  
Mode).  
PC Communications:  
The Setup Disk also allows the user to query the unit for operating status  
such as Flow Rate, Flow Total, Temperature, Density, Presets, etc.  
Operation of RS-232 Serial Port with Printers:  
Transaction Printing  
For transaction printing, the user defines the items to be included in the  
printed document (see section 6.3.20 SET DATA OUTPUT, Select_list). The  
transaction document can be initiated by pressing the PRINT key or by a  
remote contact closure.  
Data Logging  
In data logging, the user defines the items to be included in each data log  
(see section 6.3.20 SET PRINTER OUTPUT, Select_list). The user can also  
select when (time of day) or how often (print interval) the data log is to be  
made (see section 6.3.19 SET PRINTER OUTPUT, Configure).  
System Setup and Maintenance Report  
The system setup and maintenance report lists all of the instrument setup  
parameters and usage for the current instrument configuration. The audit  
trail information and a status report is also printed. This report is initiated in  
the Test menu (see section 8.2.3 PRINT SYSTEM SETUP).  
RS-485 Serial Port  
(Rate/Total mode)  
5.3.6 RS-485 Serial Port (optional)  
RS-485 Port Description:  
The optional RS-485 card utilizes Modbus RTU protocol to access  
a variety of process parameters and totalizers. The Relays can  
be controlled via Modbus. In addition, action routines can be  
executed. For further information, contact factory and request  
RS-485 Protocol manual.  
Operation of Serial Communication Port with PC  
The flow computer's RS-485 channel supports a number of  
Modbus RTU commands. Modbus RTU drivers are available  
from third party sources for a variety of Man Machine Interface  
software for IBM compatible PC's.  
The user reads and writes information from/to the RS-485 using  
the Modbus RTU commands. The FC-21 then responds to these  
information and command requests.  
Process variables and totalizers are read in register pairs in  
floating point format. Time and date are read as a series of  
integer register values. Alarms are individually read as coils.  
Action routines are initiated by writing to coils.  
15  
FC-21 Flow Computer  
5.4 Batcher Operation  
The Batcher mode is used primarily to control batches. The main difference  
between the Batch mode and Rate/Total mode is the relay operation. The  
Batch mode allows the operator to "START" the unit via the front panel or  
remote input. Once started, the relays (RLY1 & RLY2) will energize and send  
power to a flow control device (i.e. solenoid valve or pump). The flow sensor  
will send a signal to the unit and total accumulation will begin. When the  
Prewarn value (PRE 2) is reached, Relay 2 will drop out (this is ideal for flow  
slow down). When the Batch amount (PRE 1) is reached, Relay 1 will drop out  
and the Batch is complete.  
Several messages will be displayed during normal batch operation (i.e. Batch  
Fill, Batch Stopped). The keypad is disabled for the duration of these timed  
messages (approx. 2 sec).  
Batcher Configuration  
5.4.1 Batcher Configuration.  
When the unit is programmed for batch mode, several batch operation choices  
are available. These choices include: Up or Down Counting, Maximum Batch  
Preset, Batch Overrun Compensation, Auto Batch Restart, Time Delay, Flow  
Signal Timeout, Maximum Drain Time, Slow Start Quantity, Start or Reset/Start,  
and Stop or Stop/Reset.  
Batch Count Mode  
The Batch Count Mode allows the user to choose whether the unit will batch up  
to a preset value or batch down from a preset value to zero.  
Maximum Batch Preset  
The Maximum Batch Preset allows the user to program the Maximum Batch  
value allowed to be entered by the operator. If an operator should try to  
program a batch higher then this value, the unit will not allow the value to be  
entered and will prompt the user with an error message saying that the Maximum  
Batch Preset has been exceeded.  
Batch Overrun  
The Batch Overrun is used for batch applications that have slow responding  
valves and a consistent batching flowrate. When the Batch Overrun is set, the  
unit will compensate for batch overruns by computing an averaged overrun  
value from the last four batches. This average is used to internally adjust the  
batch setpoint to minimize overrun.  
Auto Batch Restart  
The Auto Batch Restart function allows the user to set an amount of time to  
automatically restart a batch after the completion of a batch. This time can be  
set from 1 to 99 seconds.  
Time Delay  
The Time Delay for Auto Batch Restart functions as follows: When a batch is  
completed, the next batch will automatically start after the amount of time  
entered here.  
Flow Signal Timeout  
The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds.  
If a batch is “Filling” and zero flow persists for more than the user entered time  
then the batch will be aborted. This prevents over flows due to faulty flow  
sensors and/or wiring.  
Maximum Drain Time  
The unit declares that a batch is “done” when the flow rate equals “0”. A flow  
rate may be present long after the Preset Relay de-energizes due to slow  
reacting valves or leaky valves. The Maximum Drain Time allows the user to  
enter an amount of time (0 to 99 seconds) to wait before declaring “Batch  
Done”. After the Preset Batch quantity is reached, the unit will declare “Batch  
Done” when the flow rate is “0” or the Maximum Drain Time has expired. The  
batch data will then be available for printing and datalogging.  
16  
FC-21 Flow Computer  
Slow Start Quantity  
The Slow Start Quantity is a function that allows an amount to be entered for a  
Slow Start up. This function requires two stage valve control. RLY 1 (slow flow)  
will energize for Slow Start and RLY 2 (fast flow) will energize after the Slow  
Start Quantity has been delivered. This helps reduce turbulence when filling an  
empty container.  
START, RESET/START and STOP, STOP/RESET  
When configuring the control inputs, Control Input1 can be set for START or  
RESET/START. When set for START, the unit will start batching when a signal  
is applied to Control Input1 or the front panel Start key is pressed. A separate  
Reset signal must be used to clear the previous batch total. When set for  
RESET/START, the unit will automatically reset then start when a signal is  
applied to Control Input1 or the front panel Start key is pressed (provided that  
the pervious batch was completed). If a previous batch was stopped during a  
batch cycle, the unit will Start from where it was stopped.  
Control Input 2 can be set for STOP or STOP/RESET. When set for STOP, the  
unit will stop batching when a signal is applied to Control Input 2 or the front  
panel Stop key is pressed. A separate Reset signal must be used to clear the  
batch total. When set for STOP/RESET, a running batch will stop when a  
signal is applied to Control Input 2 or the front panel Stop key is pressed. If the  
unit is Stopped or after a completed batch, the unit will reset when a signal is  
applied to Control Input 2 or the front panel Stop key is pressed.  
NOTE: Applying a voltage level to Control Input 2 will inhibit all Start inputs in  
either mode.  
Password Protection  
(Batch mode)  
5.4.2 Password Protection for Batcher Mode  
After an Operator and/or Supervisor Password is entered in the setup mode  
(see section 6.3, SETUP PASSWORD submenu), the unit will be locked. The  
unit will prompt the user for the password when trying to perform the following  
functions:  
Clear Grand Total  
Enter Menu  
The Supervisor password should be reserved for supervisors. The Supervisor  
password will allow access to restricted areas of the Setup and Test menus.  
The passwords are factory set as follows:  
Operator = 0  
Supervisor = 2000  
Relay Operation  
(Batch mode)  
5.4.3 Relay Operation in Batcher mode  
Up to four relays are available (two standard) for alarm outputs. Preset 1  
(RLY1) is reserved for batch amount, Preset 2 (RLY2) is reserved for prewarn.  
(see section 5.4 Batcher Operation for Relay 1 & Relay 2 functions)  
Preset 1 (RLY1) and Preset 2 (RLY2) are easily accessible by pressing the PRE  
1 or PRE 2 key on the front panel. Preset 3 and Preset 4 are accessible only  
through the setup menu.  
Relays 3 and 4 can be assigned to trip according to rate, total, temperature,  
overrun or alarm. When Rate is selected the relays can be programmed for low  
or high alarms.  
Pulse Output  
(Batch mode)  
5.4.4 Pulse Output in Batcher mode  
The isolated pulse output (open collector) is menu assignable to Volume Total,  
Corrected Volume Total or Mass Total. The pulse output duration can be set for  
10mS (50 Hz max) or 100mS (5 Hz max). A pulse output scale factor (pulse  
value) can be set to scale the pulse output. The pulse output is ideal for  
connecting to remote totalizers or other devices such as a PLC. See section 1.3  
for electrical specifications.  
Analog Output  
(Batch mode)  
5.4.5 Analog Output in Batcher mode  
The analog output is menu assignable to correspond to the Volume Rate,  
Corrected Volume Rate, Mass Rate, Temperature, Density, Volume Total,  
Corrected Volume Total or Mass Total. The analog output is ideal for "trend"  
tracking using strip chart recorders or other devices.  
17  
FC-21 Flow Computer  
RS-232 Serial Port  
5.4.6 RS-232 Serial Port Operation in Batcher mode  
(Batch mode)  
The RS-232 serial port can be used for programming (using the Setup Disk)  
or for communicating to printers and computers in the Operating Mode (Run  
Mode).  
PC Communications:  
The Setup Disk also allows the user to query the unit for operating status such  
as Flow Rate, Flow Total, Temperature, Density, Presets, etc.  
Operation of RS-232 Serial Port with Printers:  
Transaction Printing  
For transaction printing, the user defines the items to be included in the  
printed document (see section 6.3.20 SET DATA OUTPUT, Select_list). The  
transaction document can be initiated by pressing the PRINT key, by a  
remote contact closure or print at end of batch.  
Data Logging  
In data logging, the user defines the items to be included in each data log (see  
section 6.3.20 SET PRINTER OUTPUT, Select_list). The user can also  
select when (time of day) or how often (print interval) the data log is to be  
made (see section 6.3.19 SET PRINTER OUTPUT, Configure).  
System Setup and Maintenance Report  
The system setup and maintenance report lists all of the instrument setup  
parameters and usage for the current instrument configuration. The audit trail  
information and a status report is also printed. This report is initiated in the  
Test menu (see section 8.2.3 PRINT SYSTEM SETUP).  
RS-485 Serial Port  
(Batch mode)  
5.4.7 RS-485 Serial Port (optional)  
RS-485 Port Description:  
The optional RS-485 card utilizes Modbus RTU protocol to access  
a variety of process parameters and totalizers. Batches/Relays  
can be controlled remotely via Modbus. In addition, action routines  
can be executed. For further information, contact factory and  
request RS-485 Protocol manual.  
Operation of Serial Communication Port with PC  
The flow computer's RS-485 channel supports a number of  
Modbus RTU commands. Modbus RTU drivers are available  
from third party sources for a variety of Man Machine Interface  
software for IBM compatible PC's.  
The user reads and writes information from/to the RS-485 using  
the Modbus RTU commands. The FC-21 then responds to these  
information and command requests.  
Process variables and totalizers are read in register pairs in  
floating point format. Time and date are read as a series of  
integer register values. Alarms are individually read as coils.  
Action routines are initiated by writing to coils.  
18  
FC-21 Flow Computer  
6. PROGRAMMING  
6.1 Front Panel Operation Concept for Program Mode  
The FC-21 is fully programmable through the front panel. Please review  
the following usage summary before attempting to use the instrument.  
TOTAL  
1
RATE  
2
PRE 1  
3
TEMP  
4
PRINT  
5
CLEAR  
MENU  
START  
STOP  
TIME  
HELP  
GRAND  
6
SCROLL  
7
PRE 2  
8
DENS  
9
ENTER  
0
Setup Mode:  
MODE CHANGES  
Pressing the MENU key will offer selections of RUN, SETUP, TEST.  
RUN is the normal operating mode for the instrument. SETUP offers  
various sub-menus used for instrument setup. TEST offers various  
sub-menus for Test, Calibration and System Start-up.  
How To Make Mode  
Changes  
How To Navigate  
Through Sub-Menu  
Groups  
Submenu GROUP NAVIGATION  
Use the UP and DOWN arrow keys to navigate up and down through  
the Sub-Menu groups when in the SETUP or TEST mode. Press the  
ENTER key to enter a desired setup or test Sub-Menu group.  
How To Select  
Program Choices  
SELECTION OF ITEM  
During setup, the unit will often offer multiple choices for a given topic.  
The topic prompt appears on the top line of the display. The choices are  
shown on the lower line of the display.  
To select an item, press the key beneath the desired choice. The  
selected choice will blink. Press the ENTER key to accept the  
selected choice.  
How To Enter  
Numeric Values  
NUMERIC ENTRY  
The keys labeled "0 - 9", "–", ".", CLEAR and ENTER are used to enter  
numerical values. A leading 0 will assume that you intend to enter a  
minus "–" sign. Press the CLEAR key to clear the existing value and to  
enable editing.  
How To Enter  
Text Characters  
TEXT CHARACTER ENTRY  
Some setup items (i.e. Descriptors, Units Label) require the user to  
enter text characters. Press CLEAR to enable editing. The UP and  
DOWN arrow keys are used to scroll through the available character  
sets for each individual character. Press the ENTER key to accept the  
character and advance to the next character.  
19  
FC-21 Flow Computer  
6.2 EZ Setup  
The EZ Setup routine is a quick and easy way to configure the unit for the most  
commonly used instrument functions. This setup assumes that you are  
measuring Volumetric Flow using a high level, DC Pulsing flow sensor. Entering  
the EZ Setup mode automatically sets many features. This may cause any  
previously programmed information to be lost or reset. For a complete  
customized configuration, see sections 6.3 and 6.4.  
Menus  
Display  
Notes  
6.2.1  
TOP LEVEL  
SETUP MENU  
SELECT OPERATE STATE Select Setup to enter the instrument  
Run Setup Test setup routine.  
ENTER  
SELECT EZ SETUP  
Press ENTER to begin EZ Setup  
routine.  
6.2.2  
EZ Setup  
Submenu  
Groups  
ENTER  
ARE YOU SURE?  
No  
Confirm that you want to run EZ Setup.  
Yes Caution: Any previous program  
settings may be lost or reset.  
ENTER  
INSTRUMENT TYPE  
Rate/Tot  
Instrument Type.  
Batch  
ENTER  
RATE TIME BASE  
Sec Min Hour Day  
Select the appropriate rate time base.  
ENTER  
RATE DEC PLACES  
Enter the desired rate decimal location.  
0 0-3 decimal places allowed.  
ENTER  
TOTAL VOLUME UNITS  
Enter the desired totalizer units label.  
gal  
ENTER  
TOTAL DEC PLACES  
Enter the desired totalizer decimal  
0 location. 0-3 decimal places allowed.  
ENTER  
K_FACTOR TYPE  
Avg LinTbl UVC  
Enter the desired K-Factor Type.  
ENTER  
AVERAGE KA-FACTOR  
If Average selected, Enter the desired  
####### P/gal Average K-Factor.  
LINEAR TABLE KA  
Fre01:######## Hz  
If LinTbl or UVC selected,  
Enter the desired frequency/ K-Factor  
pair for each point in the Linearization  
Table.  
Enter a frequency of 0 for any point  
other than Fre01 to exit Linearization  
Table setup.  
ENTER  
LINEAR TABLE KA  
KA--01:##########  
ENTER  
FS ANALOG OUT 20mA  
Enter the desired full scale setting for  
#######gal/m the analog output.  
ENTER  
RATE  
TOTAL  
00.0 gal/m Return to Run Mode  
0 gal  
20  
FC-21 Flow Computer  
6.3 Setup Menus  
Display  
Menus  
Notes  
6.3.1  
Top Level Setup  
Menu  
SELECT OPERATE STATE  
Run Setup Test  
Select Setup to enter the instrument setup  
routine.  
MENU  
ENTER  
SELECT EZ SETUP  
Refer to Page 20 for Details.  
Refer to Page 22 for Details.  
Refer to Pages 22 for Details.  
Refer to Page 23 & 24 for Details.  
Refer to Page 25, 26 & 27 for Details.  
Refer to Pages 28 for Details.  
Refer to Page 29 for Details.  
Refer to Pages 29 for Details.  
Refer to Page 30 for Details.  
Refer to Page 30 & 31 for Details.  
Refer to Page 32 for Details.  
Refer to Page 33 for Details.  
Refer to Page 34 for Details.  
Refer to Pages 35 & 36 for Details.  
Refer to Page 36 for Details.  
Refer to Page 37 for Details.  
START  
6.3.2  
Submenu  
Groups  
STOP  
START  
INSTRUMENT TYPE  
STOP  
START  
SELECT FLOW EQUATION  
STOP  
START  
SETUP INDICATORS  
STOP  
START  
SETUP FLOW INPUT  
STOP  
START  
SETUP AUX INPUT  
STOP  
START  
SET FLUID PROPERTIES  
STOP  
START  
SETUP PULSE OUTPUT  
STOP  
START  
SETUP ANALOG OUTPUT  
STOP  
START  
SETUP RELAYS  
STOP  
START  
SETUP CONTROL INPUTS  
STOP  
START  
SETUP REALTIME CLOCK  
STOP  
START  
SERIAL USAGE  
STOP  
START  
SETUP DATALOG/PRINT  
STOP  
START  
ADMINISTRATIVE SETUP  
STOP  
START  
STOP  
SETUP NETWORK CARD  
21  
FC-21 Flow Computer  
6.4 Setup Sub-Menus  
Sub-menus  
Display  
Notes  
6.4.1  
Refer to page 20 for EZ Setup routine.  
SELECT EZ SETUP  
SELECT EZ SETUP  
Press the DOWN (stop) key to advance to  
Instrument Type. Press the UP (start) key to  
advance to Administrative Setup.  
STOP  
START  
Advance To  
INSTRUMENT TYPE  
6.4.2  
Press ENTER to enter Instrument Type sub-  
menus.  
INSTRUMENT TYPE  
INSTRUMENT TYPE  
ENTER  
Rate/Tot  
Press ENTER when Rate/Total is flashing to  
configure the instrument as a Ratemeter/  
Totalizer.  
INSTRUMENT TYPE  
Rate/Tot  
Batch  
STOP  
ENTER  
START  
If Rate/Tot selected, advance to Select Flow  
Equation.  
Advance To  
SELECT FLOW EQUATION  
Press ENTER to enter Instrument Type sub-  
menus.  
INSTRUMENT TYPE  
ENTER  
Batch  
Press ENTER when Batch is flashing to  
configure the instrument as a Batcher.  
INSTRUMENT TYPE  
Rate/Tot  
Batch  
STOP  
ENTER  
START  
Select UP to Reset to 0 and count up to preset.  
Select DOWN to reset to Preset and count  
down to 0.  
Down  
BATCH COUNT MODE  
Up  
STOP  
ENTER  
START  
Enter the maximum allowable Batch Preset.  
The operator will not be able to enter a batch  
preset larger than this value.  
MAXIMUM BATCH PRESET  
1000.0 gal  
STOP  
ENTER  
START  
Select ON to set the unit to operate using a  
Batch Overrun Compensation routine.  
Select OFF to inhibit Batch Overrun  
BATCH OVERRUN COMP  
Off  
On  
On  
Compensation routine. (See Section 5.4)  
STOP  
ENTER  
START  
Select On to enable the Auto Batch Restart. This  
will automatically restart the unit at the end of  
each batch run. Select Off if this is not desirable.  
AUTO BATCH RESTART  
Off  
STOP  
ENTER  
START  
Enter Time Delay for Auto Batch Restart.  
When a batch is completed, the next batch will  
start after the amount of time entered here.  
TIME DELAY (1-99sec)  
10  
ENTER  
Enter a timeout of 0 to 99 seconds. If a batch is  
“Filling” and zero flow persists for more than this  
time, the batch will be aborted.  
FLOW SIGNAL TIMEOUT  
10  
ENTER  
Enter time (0-99 sec.) for Max. Drain Time. After batch  
quantity is reached, “Batch Done” is declared when the  
flow rate is “0” or the Maximum Drain Time has expired.  
MAXIMUM DRAIN TIME  
10  
ENTER  
Enter a quantity for a Slow Start up. RLY 2  
(slow flow) will energize for Slow Start and RLY  
1 (fast flow) will energize after the Slow Start  
Quantity has been delivered.  
SLOW START QUANTITY  
10  
ENTER  
Advance To  
SELECT FLOW EQUATION  
22  
FC-21 Flow Computer  
Sub-menus  
Notes  
Display  
6.4.3  
SELECT  
FLOW EQUATION  
SELECT FLOW EQUATION  
Press ENTER to enter Select Flow Equation  
submenus.  
ENTER  
SELECT FLOW EQUATION  
Volume Mass Cor/Vol  
Press ENTER when desired flow equation is  
flashing.  
ENTER  
Advance To  
SETUP INDICATORS  
(Total)  
6.4.4  
SETUP INDICATORS  
Press ENTER to begin setup of the Indicators  
SETUP  
INDICATORS  
(Total)  
ENTER  
SETUP INDICATORS  
Total Dens Rate Temp  
Press ENTER when Total is flashing to  
configure the Totalizer Indicators  
ENTER  
TOTAL DESCRIPTOR  
TOTAL  
Enter the desired Total Descriptor  
ENTER  
TOTAL VOLUME UNITS  
gal  
Enter the desired Volume Units Label for the  
Totalizer.  
ENTER  
TOTAL DEC PLACES  
0
Select the desired Total Decimal Place.  
0-3 decimal places allowed.  
ENTER  
Advance To  
SETUP INDICATORS  
(Density)  
6.4.5  
SETUP  
INDICATORS  
(Density)  
SETUP INDICATORS  
Total Dens Rate Temp  
Press ENTER when Dens is flashing to  
configure the Density Indicators.  
ENTER  
DENSITY DESCRIPTOR  
DENS  
Enter the desired Density Descriptor.  
ENTER  
DENSITY MASS UNITS  
lbs  
Enter the desired Mass Units Label for  
Density.  
ENTER  
DENSITY DEC PLACES  
0
Select the desired Density Decimal Place.  
0-3 decimal places allowed.  
ENTER  
Advance To  
SETUP INDICATORS  
(Rate)  
23  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.6  
SETUP INDICATORS  
Total Dens Rate Temp configure the Ratemeter Indicators  
Press ENTER when Rate is flashing to  
SETUP  
INDICATORS  
(Rate)  
ENTER  
RATE TIME BASE  
Select the desired Rate Time Base.  
Sec Min Hour Day  
ENTER  
RATE DESCRIPTOR  
Enter the desired Descriptor for the  
RATE Ratemeter.  
ENTER  
RATE DEC PLACES  
Select the desired Rate Decimal Place.  
0 0-3 decimal places allowed.  
ENTER  
RATE AVG FILTER  
Enter desired Rate Averaging Filter.  
0
ENTER  
QUICK UPDATE %  
Enter desired Percent of Change for Quick  
5 Update. If the current flowrate deviates by an  
amount greater than the percentage value  
entered, the Rate Averaging is inhibited.  
(See Page 57 for more details.)  
ENTER  
Advance To  
SETUP INDICATORS  
(Temperature)  
6.4.7  
SETUP  
INDICATORS  
(Temperature)  
SETUP INDICATORS  
Total Dens Rate Temp configure the Temperature Indicators.  
Press ENTER when Temp is flashing to  
ENTER  
TEMP DESCRIPTOR  
Enter the desired Temperature Descriptor.  
Enter the desired Temperature Scale.  
TEMP  
ENTER  
TEMPERATURE SCALE  
Deg_C Deg_F  
ENTER  
TEMP DEC PLACES  
Select the desired Temperature Decimal  
0 Place. 0-3 decimal places allowed.  
ENTER  
Advance To  
SETUP FLOW INPUT  
24  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.8  
SETUP  
Press ENTER to begin setup of Flow Input.  
SETUP FLOW INPUT  
FLOW INPUT  
(Pulse - Ain & PS  
(A=B))  
ENTER  
Select the desired Excitation Voltage.  
EXCITATION VOLTAGE  
5v  
12v  
24v  
ENTER  
Press ENTER when Pulse is flashing to  
configure the flow input for Pulse signals.  
FLOW INPUT TYPE  
Pulse Analog  
ENTER  
NOTE:  
Enter the desired Pulse type. See side note.  
Select the desired Input Pulse Trigger Level.  
PULSE INPUT TYPE  
Ain PS(A=B) Qx1 Qx2  
Ain = Single Pulse  
PS(A=B) = Pulse  
Security  
Qx1 = Quadrature  
Qx2 = Quadrature x 2  
ENTER  
PULSE TRIGGER LEVEL  
10mV 100mV 2.5V  
ENTER  
Select the desired Low Pass Filter.  
(Max. Count Speed).  
LOW PASS FILTER  
40Hz 3KHz 20KHz  
ENTER  
Select the proper input termination.  
INPUT TERMINATION  
Pullup Pulldown None  
ENTER  
Enter the desired Maximum Sample Window  
Time (1-99 sec).  
MAX WINDOW (1-99)  
1
ENTER  
Enter the desired K-Factor Type.  
K_FACTOR TYPE  
Avg LinTbl UVC  
ENTER  
If Avg selected, Enter the desired Average K-  
Factor.  
AVERAGE KA-FACTOR  
####### P/gal  
If LinTbl selected,  
LINEAR TABLE KA  
Enter the desired frequency/ K-Factor pair for  
each point in the Linearization Table.  
NOTE: Enter 0 for Fre value of any point  
(other than Fre01) to exit the routine  
and use the values entered up to that  
point.  
Fre01:######## Hz  
ENTER  
LINEAR TABLE KA  
KA--01:####### P/gal  
ENTER  
Enter the desired volumetric Low Rate Alarm.  
This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
LOW FLOW RATE ALARM  
####### gal/m  
ENTER  
Enter the desired volumetric High Rate Alarm.  
This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
HIGH FLOW RATE ALARM  
####### gal/m  
ENTER  
Advance To  
SETUP AUX INPUTS  
25  
FC-21 Flow Computer  
Submenus  
Display  
SETUP FLOW INPUT  
Notes  
6.4.9  
SETUP  
Press ENTER to begin setup of Flow Input.  
FLOW INPUT  
(Pulse - Quadrature,  
Qx1 or Qx2)  
ENTER  
Select the desired Excitation Voltage.  
EXCITATION VOLTAGE  
5v  
12v  
24v  
ENTER  
Press ENTER when Pulse is flashing to  
configure the flow input for Pulse signals.  
FLOW INPUT TYPE  
Pulse Analog  
ENTER  
NOTE:  
Enter the desired Pulse type. See side note.  
Select the desired Input Pulse Trigger Level.  
PULSE INPUT TYPE  
Ain PS(A=B) Qx1 Qx2  
Ain = Single Pulse  
PS(A=B) = Pulse  
Security  
Qx1 = Quadrature  
Qx2 = Quadrature x 2  
ENTER  
PULSE TRIGGER LEVEL  
10mV 100mV 2.5V  
ENTER  
Select the desired Low Pass Filter.  
(Max. Count Speed).  
LOW PASS FILTER  
40Hz 3KHz 20KHz  
ENTER  
Select the proper input termination.  
INPUT TERMINATION  
Pullup Pulldown None  
ENTER  
Enter the desired Maximum Sample Window  
Time (1-99 sec).  
MAX WINDOW (1-99)  
1
ENTER  
Enter the desired K-Factor Type.  
K_FACTOR TYPE  
Avg LinTbl UVC  
ENTER  
If Avg selected, Enter the desired Average K-  
Factor (KA for channel A).  
AVERAGE KA-FACTOR  
####### P/gal  
Enter the desired Average K-Factor (KB for  
channel B).  
AVERAGE KB-FACTOR  
####### P/gal  
If LinTbl selected,  
LINEAR TABLE KA  
Enter the desired frequency/ K-Factor pair for  
each point in the Linearization Table. (channel  
A)  
Fre01:######## Hz  
ENTER  
NOTE: Enter 0 for Fre value of any point  
(other than Fre01) to exit the routine  
and use the values entered up to that  
point.  
LINEAR TABLE KA  
KA--01:####### P/gal  
ENTER  
Enter the desired frequency/ K-Factor pair for  
each point in the Linearization Table. (channel  
B)  
LINEAR TABLE KB  
Fre01:######## Hz  
ENTER  
NOTE: Enter 0 for Fre value of any point  
(other than Fre01) to exit the routine  
and use the values entered up to that  
point.  
LINEAR TABLE KB  
KA--01:####### P/gal  
ENTER  
Enter the desired volumetric Low Rate Alarm.  
This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
LOW FLOW RATE ALARM  
####### gal/m  
ENTER  
Enter the desired volumetric High Rate Alarm.  
This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
HIGH FLOW RATE ALARM  
####### gal/m  
ENTER  
Advance To  
SETUP AUX INPUTS  
26  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.10  
SETUP  
FLOW INPUT  
(Analog)  
SETUP FLOW INPUTS  
Press ENTER to begin setup of the Flow  
Input.  
ENTER  
EXCITATION VOLTAGE  
Select the desired Excitation Voltage.  
5v  
12v  
24v  
ENTER  
FLOW INPUT TYPE  
Pulse Analog  
Press ENTER when Analog is flashing to  
configure the flow input for Analog signals .  
ENTER  
ANALOG SIGNAL TYPE  
Voltage Current  
Choose Analog Signal Type.  
ENTER  
ANALOG VOLTAGE RANGE If Voltage selected,  
0-10V 0-5V 1-5V Choose desired Voltage Range.  
ANALOG CURRENT RANGE If Current selected,  
4-20mA  
0-20mA Choose desired Current Range.  
ENTER  
LINEARIZATION TYPE  
Linear Sqrt LinTbl  
Select the desired Linearization Type.  
If LinTbl selected,  
ENTER  
LINEAR TABLE KA  
APR01:######## gal/m Enter the desired Apparent Input Flow (APR) /  
Correction Factor (CFr) pair for each point in  
ENTER  
the Linearization Table.  
LINEAR TABLE KA  
CFr01:########  
NOTE: Enter 0 for APR value of any point  
(other than APR01) to exit the routine  
and use the values entered up to that  
point.  
ENTER  
FLOW LOW SCALE  
Enter the low flowrate corresponding to the  
####### gal/m low analog signal.  
ENTER  
FLOW FULL SCALE  
Enter the High flowrate corresponding to the  
####### gal/m High analog signal.  
ENTER  
LOW FLOW CUTOFF  
Enter the desired Low Flow Cutoff.  
####### gal/m  
ENTER  
LOW FLOW RATE ALARM  
Enter the desired volumetric Low Rate Alarm.  
####### gal/m This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
ENTER  
HIGH FLOW RATE ALARM Enter the desired volumetric High Rate Alarm.  
####### gal/m This will trigger an alarm message if alarm  
conditions occur. The relays are not affected.  
ENTER  
Advance To  
SETUP AUX INPUT  
27  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.11  
SETUP AUX INPUT  
SETUP AUX INPUT  
Press ENTER to begin setup of the Auxiliary  
Input.  
ENTER  
AUX INPUT TYPE  
None Dens Temp for Temperature inputs.  
Select Temperature to set the Auxiliary Input  
NOTE:  
When Density (Dens)  
is selected, The menu  
prompts will be very  
similar to the Tem-  
perature prompts.  
The menus will  
prompt the user for  
density values and  
density units.  
ENTER  
AUX SIGNAL TYPE  
Voltage Current RTD Advance to "Aux Default", if RTD selected.  
Choose Temperature Signal Type.  
ENTER  
INPUT SIGNAL RANGE  
If Voltage selected,  
0-10V 0-5V 1-5V Choose desired Voltage Range. Skip if RTD.  
INPUT SIGNAL RANGE  
If Current selected,  
4-20mA  
0-20mA Choose desired Current Range. Skip if RTD.  
ENTER  
AUX LOW SCALE  
Enter the low temperature scale  
###### F corresponding to the low temperature signal.  
Skip if RTD.  
ENTER  
AUX FULL SCALE  
Enter the high temperature scale  
###### F corresponding to the high temperature signal.  
Skip if RTD.  
ENTER  
AUX DEFAULT  
Enter the Default Temperature.  
###### F The unit will use this value if the temperature  
input fails.  
ENTER  
AUX LOW ALARM  
Enter the Low setpoint for the Temperature  
Enter the High setpoint for the Temperature  
Choose the Density Extraction method to be  
###### F Alarm.  
ENTER  
AUX HIGH ALARM  
###### F Alarm.  
ENTER  
DENS EXTRACT METHOD  
Therm_Coef API_2540 used.  
ENTER  
Advance To  
SET FLUID PROPERTIES  
28  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.12  
SET FLUID  
PROPERTIES  
SET FLUID PROPERTIES Press ENTER at this prompt to Set Fluid  
Properties.  
ENTER  
Enter the Reference Density. This is used in  
REF. DENSITY  
the calculation of density when you have a  
###### lbs/g temp transmitter and used for corrected flow  
calculation if you have a density transmitter.  
ENTER  
REF. TEMPERATURE  
###### F  
Enter the Reference Temperature.  
ENTER  
Enter the proper Expansion Factor.  
EXPAN. FACTOR [xe-6] (If Temp Compensated for Mass or Corrected  
######## Volume) See Section 7.4, Calculating the  
Expansion Factor.  
ENTER  
CALIBRATION DENSITY Enter the Calibration Density. This is used in  
######## calculation of flow for analog inputs using SQRT.  
ENTER  
VISCOSITY COEF. A  
0.000  
Enter the Viscosity A Coefficient. See section  
7.5, Computation of Viscosity Coef. A and B.  
ENTER  
VISCOSITY COEF. B  
0.000  
Enter the Viscosity B Coefficient. See section  
7.5, Computation of Viscosity Coef. A and B.  
ENTER  
BASE DENSITY H2O@4C Enter the Base Density H2O@4C. This is  
###### lbs/g used in the centistoke calculation for UVC.  
ENTER  
Advance To  
SETUP PULSE OUTPUT  
6.4.13  
SETUP  
PULSE OUTPUT  
SETUP PULSE OUTPUT  
Press ENTER at this prompt to setup the  
Pulse Output.  
ENTER  
PULSE OUTPUT USAGE  
Off Vol CVol/Mass  
Select the desired Pulse Output Usage.  
Select the desired Pulse Width for the Pulse  
Enter the desired Pulse Value for the Pulse  
ENTER  
PULSE WIDTH  
10mS  
100mS Output.  
ENTER  
PULSE VALUE  
####### gal/P Output (Units per Pulse).  
ENTER  
Advance To  
SETUP ANALOG OUTPUT  
29  
FC-21 Flow Computer  
Sub-menus  
Display  
SETUP ANALOG OUTPUT  
ENTER  
Notes  
6.4.14  
SETUP  
ANALOG OUTPUT  
Press ENTER when Analog is flashing to  
setup the Analog Output.  
ANALOG OUTPUT USAGE  
Rate Total Temp Dens  
Select the desired Analog Output Usage.  
ENTER  
ANALOG OUT FLOW TYPE Only if Rate selected & Flow EQ. = Mass, Cor/Vol  
CVol/Mass Select the desired Analog Output Flow.  
Vol  
ENTER  
ANALOG OUTPUT RANGE  
4-20mA  
Select the desired current range for the Analog  
0-20mA Output.  
ENTER  
LS ANALOG OUTPUT  
Enter desired Analog Output Low Scale Value.  
####### gal/m NOTE: Units label will correspond with output  
usage type selected.  
ENTER  
FS ANALOG OUT 20mA  
Enter desired Analog Output Full Scale Value.  
####### gal/m  
ENTER  
ANALOG OUT DAMPING  
0.0  
Enter the desired Analog Output Damping  
Constant.  
ENTER  
Advance To  
SETUP RELAYS  
6.4.15  
SETUP RELAYS  
(Relay 1 & Relay 2)  
SETUP RELAYS  
Rly1 Rly2 Rly3 Rly4  
Select the desired Relay for setup.  
(Relays 3 & 4 Optional)  
ENTER  
NOTE:  
If Relay 1 or Relay 2 Selected,  
Select Rate, Total or NA.  
RELAY 1 USAGE  
RATE TOTAL NA  
In Batch mode,  
Relay 1 is reserved  
for Preset,  
ENTER  
Relay 2 is reserved  
for Prewarn.  
If Rate selected, enter desired relay activation  
delay value.  
RELAY 1 DELAY sec  
0
ENTER  
Select the desired Relay Activation.  
Low: Relay activates when reading is below  
setpoint.  
RELAY 1 MODE  
LO_ALARM HI_ALARM  
High:Relay activates when reading is above  
setpoint.  
ENTER  
If Total Selected, Enter desired Relay  
Duration.  
RELAY 1 DURATION  
#####  
ENTER  
Enter the desired Setpoint. The Setpoint can  
be edited in run mode using the PRE 1 key  
(PRE 2 key for Relay 2).  
RELAY 1 SETPOINT  
####### gal  
ENTER  
If Rate, selected, Enter desired Relay  
Hysteresis.  
RELAY 1 HYSTERESIS  
##### gal/m  
ENTER  
Advance To  
SETUP RELAYS 3, 4  
30  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
Select the desired Relay for setup.  
6.4.15 (Continued)  
SETUP RELAYS  
(Relay 3 & Relay 4)  
SETUP RELAYS  
Rly1 Rly2 Rly3 Rly4 (Relays 3 & 4 Optional)  
ENTER  
NOTE:  
RELAY 3 USAGE  
If Relay 3 Selected,  
Rate Tot Aux Ovrn NA Choose Rate, Total, Aux, Ovrn or NA.  
Settings for Relays  
3 & 4 may be  
entered even if  
relays are not  
supplied. The  
settings will still  
trigger display  
alarms.  
RELAY 4 USAGE  
If Relay 4 Selected,  
Rate Tot Aux Alrm NA Choose Rate, Total, Aux, Alrm or NA.  
ENTER  
RELAY 3 DELAY sec If Rate / Aux selected, enter desired relay  
0
activation delay value.  
ENTER  
Select the desired Relay Activation for Rate/Aux.  
Low: Relay activates when reading is below  
setpoint.  
RELAY 3 MODE  
LO_ALARM HI_ALARM  
High:Relay activates when reading is above  
setpoint.  
ENTER  
RELAY 3 DURATION  
If Total Selected, Enter desired Relay  
##### Duration.  
ENTER  
RELAY 3 SETPOINT  
Enter the desired Setpoint.  
####### gal  
ENTER  
RELAY 3 HYSTERESIS  
If Rate, selected, Enter desired Relay  
##### gal/m Hysteresis.  
ENTER  
Advance To  
SETUP CONTROL INPUTS  
RELAY NOTES & CONSIDERATIONS  
1. Relay activation is based on the computed readings not the displayed value. Therefore the display damping  
factor will not affect the relay response time. The RELAY N DELAY feature allows the user to enter a time  
delay for relay activation. This feature is very useful in applications where short over/under range conditions  
are not considered alarm conditions. The Relay is a delay on make and delay on break. Alarm condition must  
be continuously present for a time greater than the entered RELAY N DELAY in order for alarm to activate.  
Once alarmed, the alarm condition must be continuously absent for a time greater than the entered RELAY N  
DELAY in order for the alarm condition to be reset.  
2. When INSTRUMENT TYPE is set to batcher, Relay 1 is reserved for PRESET and Relay 2 is reserved for  
PREWARN.  
3. Setting the relays to NA (Not Assigned), will allow the relay activation to be controlled via the RS-232 Serial  
and/or RS-485 Modbus ports.  
4. Relay 3 and Relay 4 settings may be used to trigger display alarm conditions even if the relays are not  
supplied.  
5. Relay 4 Alarm Operation. When Relay 4 is set for Alarm (Alrm) the relay functions as follows: The relay will  
energize when it is NOT in an alarm condition. It is therefore recommended to use the Normally Closed  
(N.C.) relay contacts on Relay 4 when wiring for alarm conditions. The Alarm Relay functions in this manner  
to ensure that the alarm output will signal on power loss or blown fuse. Other alarm conditions include:  
PULSEOUT OVERFLOW  
SOFTWARE ERROR RESET  
EXTENDED PFI LOCKUP  
RTD/ THERM FAILURE  
31  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.16  
SETUP CONTROL  
INPUTS  
SETUP CONTROL INPUTS Press Enter to begin setup of the Control  
Inputs.  
ENTER  
(RATE/TOTAL)  
SETUP CONTROL INPUTS Select the desired Control Input for setup.  
Input1 Input2 Input3  
ENTER  
CONTROL INPUT1 USAGE If Control Input 1 Selected,  
INHIBIT_TOTAL NA  
Select Inhibit Total or NA (Not Assigned).  
CONTROL INPUT2 USAGE If Control Input 2 Selected,  
Select Reset Total or NA (Not Assigned).  
RESET_TOTAL  
NA  
CONTROL INPUT3 USAGE If Control Input 3 Selected,  
Prn Ack KeyLk NA  
Select Prn (Print), Ack (acknowledge), KeyLk  
(Keylock) or NA (Not Assigned). ACK will  
acknowledge and clear alarms and warning  
messages.  
ENTER  
Advance To  
SETUP REALTIME CLOCK Note: Alarms may reassert themselves if  
alarm conditions are still present.  
6.4.17  
SETUP CONTROL  
INPUTS  
SETUP CONTROL INPUTS Select the desired Control Input for setup.  
Input1 Input2 Input3  
ENTER  
(BATCH)  
CONTROL INPUT1 USAGE If Control Input 1 Selected,  
Start Rst/Start NA  
Select Start ,Reset/Start, NA (Not Assigned).  
CONTROL INPUT2 USAGE If Control Input 2 Selected,  
Stop Stop/Rst NA  
Select Stop, Stop/Reset, NA (Not Assigned).  
CONTROL INPUT3 USAGE If Control Input 3 Selected,  
Rst Prn KeyLk Ack NA Select Prn (Print), Ack (acknowledge), KeyLk  
(Keylock) or NA (Not Assigned). ACK will  
ENTER  
acknowledge and clear alarms and warning  
Advance To  
messages.  
SETUP REALTIME CLOCK Note: Alarms may reassert themselves if  
alarm conditions are still present.  
32  
FC-21 Flow Computer  
ENTER  
ENTER  
ENTER  
ENTER  
ENTER  
ENTER  
ENTER  
33  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.20  
SERIAL USAGE  
SERIAL USAGE  
Press Enter to begin setup of the Serial Port.  
ENTER  
SERIAL HARDWARE  
RS232  
Select Serial Hardware type for standard port.  
RS485 (See SETUP NETWORK CARD for RS485  
Modbus option)  
ENTER  
DEVICE ID  
Select the Device ID.  
##  
ENTER  
BAUD RATE  
Select the desired Baud Rate.  
300 600 1200 <more>  
BAUD RATE  
2400 4800 9600 19200  
(If <more> selected)  
Select the desired Parity.  
Set the Handshake.  
ENTER  
PARITY  
None Odd  
Even  
ENTER  
HANDSHAKING  
None Softwre Hardwre  
ENTER  
Choose end of line termination. Only choose  
<CR> if your external device automatically  
DEVICE LINE FEED  
<CR>  
<CR+LF> assigns a line feed for every <CR> carriage  
return.  
ENTER  
MODEM OPTIONS  
No  
Select "Yes" if the serial port will be used to  
control a modem.  
Yes  
ENTER  
MODEM INIT MASTER  
No Yes  
Select "Yes" to have the unit engage in a  
configuration conversation with the modem on  
power up .  
ENTER  
MODEM AUTO ANSWER  
No Yes  
Select the desired Modem Auto Answer mode.  
ENTER  
CALL OUT PHONE #  
Enter the Call Out Phone Number to be dialed  
0 for "Call Out Time" or "Print On Error/Alarm".  
ENTER  
CALL OUT TIME  
Enter the time of day to perform Call Out  
##:##:## transmission.  
ENTER  
Continued on Next Page  
34  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.20  
SERIAL USAGE  
(continued)  
Select "Yes" to have the unit perform a Call  
Out transmission upon error/alarm condition.  
CALL ON ERROR/ALARM  
No  
Yes  
ENTER  
Enter the number of redials to be performed  
on call out time if busy or no answer. (error/  
alarm tries until connected)  
NUMBER OF REDIALS  
0
ENTER  
Select "Yes" to perform hangup if there is  
inactivity for more than 2 minutes.  
HANGUP IF 2MIN INACT  
No Yes  
ENTER  
Advance To  
SETUP DATALOG/PRINT  
6.4.21  
SETUP  
DATALOG/PRINT  
(Configure)  
Press Enter to setup the Datalog/Print  
information.  
SETUP DATALOG/PRINT  
ENTER  
Select Config to configure the Datalog/Print  
information.  
SETUP DATALOG/PRINT  
Config Select_list  
ENTER  
Select the type of Output Format.  
OUTPUT FORMAT  
Printer Term Dbase  
ENTER  
Enter the desired Page Length.  
If Printer selected above.  
PAGE LENGTH [66 max]  
66  
ENTER  
Enter the desired Top Margin.  
If Printer selected above.  
TOP MARGIN [60 max]  
3
ENTER  
Select Yes to record events to the datalogger  
only. Events will not be sent to the serial port.  
DATALOG PRINT ONLY  
No  
Yes  
ENTER  
Enter Print Time, printer will print at this time  
every day. Enter 00:00:00 to inhibit print time.  
PRINT TIME HH:MM:SS  
00:00:00  
ENTER  
Enter Print Interval,  
Enter 00:00:00 to inhibit print interval..  
PRINT INTERVAL  
00:00:00  
ENTER  
Select YES to enable Print Key.  
Select NO to disable Print Key  
ENABLE PRINT KEY  
NO  
YES  
ENTER  
Batch mode only.  
Select Yes to print at end of batch.  
PRINT END OF BATCH  
NO YES  
ENTER  
Advance To  
SETUP DATALOG/PRINT  
(Select_list)  
35  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
6.4.22  
SETUP  
DATALOG/PRINT  
(Select_list)  
SET DATALOG/PRINT  
Press enter to begin Setup Datalog/Print  
routine.  
ENTER  
SET DATALOG/PRINT  
Press enter when Select_list is selected to  
Config Select_list setup print list.  
PRINT LIST ITEMS  
TOTAL  
Use Up and Down arrow keys to view list  
YES status.  
Press the Corresponding function key to the  
items that you wish to add or remove from the  
YES list.  
STOP  
PRINT LIST ITEMS  
RATE  
START  
Items marked with Yes will be added to the  
list,  
YES items marked with No will be removed from  
List Items:  
TOTAL  
RATE  
PRINT LIST ITEMS  
PRE 1  
PRE1  
TEMP  
the list.  
ENTER  
GRAND  
PRE2  
DENS  
PRINT LIST ITEMS  
DataLog size =001489 shows the current possible Datalog size.  
The Select Print List Information display  
TIME  
ENTER  
Advance To  
ADMINISTRATIVE SETUP  
6.4.23  
ADMINISTRATIVE  
SETUP  
ADMINISTRATIVE SETUP Press Enter to begin Administrative Setup.  
ENTER  
OPERATOR PASSWORD  
*****  
Enter Operator Password. (Factory Set to 0)  
Enter Supervisor Password.  
ENTER  
SUPERVISOR PASSWORD  
***** (Factory Set to 2000)  
ENTER  
SOFTWARE VERSION  
This display is used to show the software  
vxx.xx version of the installed software.  
ENTER  
PRODUCT ORDER CODE  
FC-21xxxxxxx  
This display is used to show the product order  
code (model number).  
ENTER  
UNIT SERIAL NUMBER  
00000  
This display is used to show the unit's serial  
number.  
ENTER  
SENSOR SERIAL NUMBER This display is used to show the sensor's  
00000  
serial number.  
ENTER  
Advance To  
SETUP NETWORK CARD  
36  
FC-21 Flow Computer  
6.4.24  
SETUP  
SETUP NETWORK CARD  
Press Enter to setup Network Card  
NETWORK CARD  
(optional)  
ENTER  
SELECT NTW PROTOCOL  
ModbusRTU  
Select desired Network Protocol.  
ENTER  
NETWORK DEVICE ID  
Enter the device address on network (00-  
1 255).  
ENTER  
BAUD RATE  
2400 4800 9600 19200  
Select the desired Baud Rate.  
Select the desired Parity.  
ENTER  
PARITY  
None Odd  
Even  
ENTER  
Advance To  
SELECT EZ SETUP?  
37  
FC-21 Flow Computer  
7. Principle Of Operation  
General  
7.1 General:  
Operation  
The FC-21 Flow Computer uses several internal calculations to compute the  
compensated flow based on specific data input. Several computations are performed  
to arrive at the uncompensated flow, temperature, density and viscosity. This information  
is then used to compute the Corrected Volume Flow or Mass Flow.  
Orifice Flowmeter 7.2 Orifice Flowmeter Considerations:  
Considerations  
Head class flowmeters are supplied by the manufacturers with a 4-20 mA output span  
which is already in flow units. The FC-21 permits the user to enter this flowmeter  
information directly. However, closely associated with this information is the density  
that was assumed during flowmeter calibration. This information must also be input if  
the user is to obtain maximum accuracy.  
It is assumed that the user has the printout from a standardized orifice sizing program  
for the particular device he will be using. Such standardized printouts list all the  
necessary information which the user will then be prompted for.  
Several specialized flow equations are listed that are not intended for the standard  
unit but to be offered to appropriate OEMs or as special order items. These are  
designated by a “†”.  
Note concerning Fluid Information  
The user will be prompted for Fluid Information during the setup of the instrument.  
The Factory will be preparing application information for several common fluid types.  
Flow Equations  
7.3 Flow Equations:  
Input Flow Computation:  
Linear or External SQRT  
Input Flow = [% input span * (flow FS - flow low scale)]+ flow low scale  
Orifice  
Input Flow = [(% input span) * ( flow FS - flow low scale)] + flow low scale  
Input Flow Computation:  
General Case  
Tf= [% input span * (temp FS - Temp low scale)] + temp low scale  
RTD Case  
Tf = f(measured input resistance)  
Input Density Computation:  
Temperature Transmitter  
density = reference density * (1 - Therm.Exp.Coef. * (Tf-Tref))2  
Density Transmitter  
density = [% input span * (density FS - density low scale)] + density low scale  
38  
FC-21 Flow Computer  
7.3 Flow Equations: (Continued)  
Flow Equations  
Input Viscosity Computation:  
B
A exp  
(
)
(Deg F + 459.67)  
† centistokes =  
Absolute Density  
Where: centistokes = cP/(kg/l)  
Uncompensated Flow Computation:  
Pulse Input; Average K-Factor  
input frequency * time scale factor  
Volume Flow =  
K-Factor  
Pulse Input; Linear Table  
input frequency * time scale factor  
Volume Flow =  
K-Factor (Hz)  
Pulse Input; UVC  
input frequency * time scale factor  
K-Factor (Hz/cstk)  
Volume Flow =  
Analog Input; Linear  
Volume Flow = input flow  
Analog Input; Linear Table  
Volume Flow = input flow * correction factor (input flow)  
Analog Input; Orifice or External SQRT  
(calibrated density)  
Volume Flow = input flow *  
(density)  
Analog Input; Orifice Linear Table or External SQRT Linear Table  
(calibrated density)  
Volume Flow = CF(rn) * input flow *  
(density)  
Corrected Volume Flow Computation:  
Temperature Transmitter  
Standard Volume Flow = volume flow * (1 - Therm.Exp.Coef. *(Tf-Tref))2  
Density Transmitter  
density  
Standard Volume Flow = volume flow *  
reference density  
Mass Flow Computation:  
Mass Flow = volume flow * density  
† These special flow equations are not available in the standard unit. They are to be  
offered to OEMs or as special order items.  
39  
FC-21 Flow Computer  
7.3 Flow Equations: (Continued)  
Flow Equations  
The above information was obtained from "Flow Measurement Engineering Handbook, 3rd  
Edition" by Richard W Miller.  
40  
FC-21 Flow Computer  
7.4 Calculating the Expansion Factor  
The liquid density is a function of the flowing temperature for many fluids. This unit  
solves an equation which represents this physical property of the fluid.  
The information which the unit uses to describe the fluid is entered by the user in  
the following variables: Reference Temperature, Reference Density, Expansion  
Factor.  
Calculating  
Expansion Factor  
This information is available for many fluids in one or more of the following forms:  
Fluid Specific Gravity vs. Temp. Table  
Specific Gravity vs. Temp. Graph  
Fluid Density vs. Temp. Table  
Fluid Density vs. Temp. Graph  
Begin by obtaining one of the fluid properties for the fluid you are using from  
available manufacturers information or Engineering Handbooks. In some cases this  
information is listed on the Material Safety Data Sheet for the fluid.  
Two temperature-specific gravity pairs will be required to compute the temperature  
coefficient.  
The reference temperature is simply chosen by the user. Common reference  
temperatures are 60° F or 15° C.  
However, for cryogenic fluids, the normal boiling point may also be used. In some  
cases the fluid data may list properties at 100° F, this temperature may also be used  
as the reference temperature.  
The reference temperature should be chosen so that it is in the application  
temperature range. i.e. application temperature range -10 to 120° F, reference  
temperature of 60° F chosen.  
Enter the reference temperature you have chosen at this point.  
The reference specific gravity corresponds to the fluid SPECIFIC GRAVITY at the  
reference temperature chosen.  
You may convert the fluid density information to specific gravity if it is in units other  
than specific gravity. Use EQ1.  
Expansion Factor  
Equations  
EQ1.  
Spec.Grav. = Density of Fluid / Density of Water  
Given the reference temperature, reference specific gravity, a second temp. and a  
second Spec.Grav., the Expansion Factor (C Factor) can be computed as follows:  
EQ2. Used for Liquid Mass and Corrected Volume Equations  
1 - (Spec.Grav.2 / Ref.Spec.Grav.)  
C =  
x 1,000,000  
[
]
Temp.2 - Ref.Temp  
Given the reference temperature, reference density, a second temp. and a second  
density, the Expansion Factor (C Factor) can be computed as follows:  
EQ3. Used for Liquid Mass and Corrected Volume Equations  
1 - (Dens.2 / Ref.Dens.)  
C =  
x 1,000,000  
[
]
Temp.2 - Ref.Temp  
41  
FC-21 Flow Computer  
7.5 Computation of Viscosity Coef. A and B  
Computation of  
Viscosity  
Coef. A & B  
The flow computer solves an equation which computes the viscosity as a  
function of temperature. Two parameters must be entered for this  
calculation to be performed. These are the setup parameters Viscosity  
Coef. A and Viscosity Coef. B.  
Alternately, if your intended fluid is not listed, the Viscosity Coef. A and B  
can be derived from two known temperature/viscosity pairs. Begin by  
obtaining this information for you intended fluid. Convert these known  
points to units of Degrees F and centipoise (cP)  
The information is now in a suitable form to compute the Viscosity Coef. A  
and Viscosity Coef. B using the following equation based on the fluid state.  
For a liquid, A and B are computed as follows:  
(T1 + 459.67) • (T2 + 459.67) • ln [ cP1/cP2]  
B =  
A =  
——————————————————————  
(T2 + 459.67) - (T1 + 459.67)  
cP1  
———————————  
exp [ B / ( T1 + 459.67) ]  
cP • Density of Water at 4°C  
——————————————  
Density of Liquid  
NOTE: cS =  
42  
FC-21 Flow Computer  
7.6 Linearization Table  
Linearization  
Table  
General  
7.6.1 Linearization Table General Information  
The Linearization Table is used when the flow input device gives a nonlinear  
input signal. The unit uses up to 16 different points, as entered by the  
operator, to form a curve for linearizing the input signal.  
Information  
Notes:  
1) A minimum of three points must be set up.  
2) If "0" is entered for the frequency of any point other than point 1, the Flow  
Computer assumes there are no more points above the points that preceded  
them. The display will advance to the next setup prompt. Extrapolation is  
taken from the last two nonzero points.  
3) If the input frequency is above the highest or below the lowest frequency  
programmed, the unit will use the last known point for the K factor in  
computing the resulting actual flow.  
4) Frequencies or apparent flows should be entered in ascending order.  
Linearization  
Table  
(Pulse Inputs)  
7.6.2 Linearization Table for Pulse Inputs  
The linearization table for pulse inputs programming is quite simple when  
values of frequency and flow are known. The Flow Computer asks for 16  
different frequencies (Freq) and 16 corresponding K factors (K). It then uses  
this data to determine what the actual flow is for any given input frequency.  
Usually the necessary data is provided with the flowmeter.  
Linearization  
Table  
(Analog Inputs)  
7.6.3 Linearization Table for Analog Inputs  
The Linearization Table for Analog inputs programming is similar to the Pulse  
input setup. The Flow Computer asks for 16 different flow rates (apparent  
flow) and 16 corresponding Correction Factors. It then uses this data to  
determine what the Actual flow is for any given apparent input signal. Again, a  
minimum of three points must be set up.  
Correction factor =  
Actual Flow  
Apparent Input Flow  
The same rules that applied for the Digital setup apply for the Analog setup as  
well.  
The Flow Computer prompts you for the Apparent input signal (APR) and a  
correction factor CFr) to multiply it by to yield true actual flow.  
Linearization  
Table  
Interpolation  
7.6.4 Linearization Table Interpolation  
The Linearization Table routine uses the entered data to determine the K  
factor for any given input frequency or input flow signal. This is done by taking  
the closest data points above and below the input signal, then using those  
points to extrapolate the K factor (correction factor), then calculating the  
uncompensated flow from the data. Below are the formulas.  
Parameters:  
Determine closest point above input signal  
signal = X,  
K factor (correction factor) = KA  
KA  
KN  
KB  
Determine closest point below input signal  
signal = Y, K factor (correction factor) = KB  
Let input signal = H,  
unknown K factor (correction factor) = KN  
Y H X  
Input  
To find KN use this formula:  
H - Y  
x (KA - KB) + KB = KN  
X - Y  
43  
FC-21 Flow Computer  
8. Test, Service and Maintenance  
8.1 Test Menus  
Display  
Menus  
Notes  
Select Test to enter the instrument  
test & calibration routine.  
NOTE: Supervisor (Service) password  
required to gain access to this mode.  
8.1.1  
TOP LEVEL  
TEST MENUS  
SELECT OPERATE STATE  
Run Setup Test  
ENTER  
Audit Trail  
Refer to Page 40 for Details.  
Refer to Page 40 for Details.  
Refer to Page 40 for Details.  
Refer to Page 41 Details.  
START  
STOP  
START  
Error history  
STOP  
START  
Print System Setup  
STOP  
START  
Keypad Test  
STOP  
START  
Display test  
Refer to Page 41 for Details.  
Refer to Pages 42 - 46 for Details.  
Refer to Page 46 Details.  
STOP  
START  
Calibrate  
STOP  
START  
Analog In Test  
STOP  
START  
Pulse input test  
Refer to Page 47 for Details.  
Refer to Page 47 for Details.  
Refer to Page 47 for Details.  
Refer to Page 48 for Details.  
Refer to Page 48 for Details.  
Refer to Page 48 for Details.  
Refer to Page 49 for Details.  
Refer to Page 49 for Details.  
STOP  
START  
Analog out test  
STOP  
START  
Excitation out test  
STOP  
START  
Pulse out test  
STOP  
START  
Relay Test  
STOP  
START  
Control inputs test  
STOP  
START  
Battery Voltage Test  
STOP  
START  
STOP  
Data logger utility  
44  
FC-21 Flow Computer  
8.2 Test Sub-Menus  
Sub-menus  
Display  
Notes  
8.2.1  
Audit Trail  
Audit Trail  
Press Enter to view the audit trail information.  
Submenu Group  
ENTER  
The audit trail is viewed in this format:  
nnnnn= number of critical menu changes,  
hh:mm:ss; mm/dd/yy = time and date of last  
change.  
Audit Trail nnnnn  
hh:mm:ss mm/dd/yy  
MENU  
Audit Trail  
Press Menu to get back to audit trail top-level  
menu.  
8.2.2  
Error History  
Submenu Group  
Error history  
Press Enter to view error history.  
NOTE: Press Print Key to print Error History. Printout  
will include time/date of each errors first occurrence.  
ENTER  
Error history  
Flow rate alarm low  
Press Up/Down arrow keys to scroll through  
error message history. Press CLEAR to clear  
entire error log.  
MENU  
Error history  
Press Menu to get back to error history  
top=level menu.  
8.2.3  
Print System Setup  
Press enter key to enter print system setup  
submenu  
Print System Setup  
Submenu Group  
ENTER  
Print System Setup  
Press ENTER to print  
Press enter to begin printing the system  
setup.  
ENTER  
Print System Setup  
—— Printing ——-  
This message will display as the data  
transmission takes place.  
MENU  
Print System Setup  
Press Menu to get back to print system setup  
top-level menu.  
45  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.4  
Keypad test  
Submenu Group  
Keypad test  
Press Enter to enter keypad test  
ENTER  
Press the various keys and the display will  
show the key that was pressed. Press Menu  
to exit the test  
Keypad test  
Key pressed—> ENTER  
MENU  
Keypad test  
Press Menu to get back to Keypad test top-  
level menu.  
Display test  
8.2.5  
Display test  
Submenu Group  
Press Enter to enter display test.  
ENTER  
Upon pressing enter the each digit on the  
display will scroll 0-9 then A-Z. Press menu to  
exit the test.  
00000000000000000000  
00000000000000000000  
MENU  
Display test  
Press Menu to get back to Display test top-  
level menu.  
46  
FC-21 Flow Computer  
ALL UNITS ARE CALIBRATED AT THE FACTORY PRIOR TO SHIPMENT  
CAUTION:  
This unit must be calibrated using precision and calibrated equipment.  
Equipment needed is as follows: Frequency Generator, Digital Multimeter,  
Precision Current/Voltage Source, Oscilloscope, Frequency Counter.  
Sub-menus  
Display  
Notes  
Calibration  
Submenu Group  
Calibrate  
Press Enter to begin the calibration routine.  
(Please note the caution above)  
ENTER  
Calibrate ch1 0mA Connect Current Source (+) TB1-3, (-) TB1-4.  
Iin=TB1-3 GND=TB1-4 Input 0mA and press Enter.  
8.2.6  
Calibrate CH1 0mA  
Submenu Group  
ENTER  
This message is displayed during calibration.  
Calibrate ch1 0mA  
CALIBRATING ——  
This message is displayed when the 0mA  
calibration is finished.  
Calibrate ch1 0mA  
*** DONE ***  
The display will automatically return to the  
Calibrate CH1 0mA submenu. Press the  
Down arrow key to advance to the CH1 20mA  
calibration.  
Calibrate ch1 0mA  
Iin=TB1-3 GND=TB1-4  
STOP  
8.2.7  
Connect Current Source (+) TB1-3, (-) TB1-4.  
Input 20mA and press Enter.  
Calibrate ch1 20mA  
Iin=TB1-3 GND=TB1-4  
Calibrate CH1 20mA  
Submenu Group  
ENTER  
This message is displayed during calibration.  
Calibrate ch1 20mA  
0 CALIBRATING ——  
This message is displayed when the 20mA  
calibration is finished.  
Calibrate ch1 20mA  
*** DONE ***  
The display will automatically return to the  
Calibrate CH1 20mA submenu. Press the  
Down arrow key to advance to the CH2 0mA  
calibration.  
Calibrate ch1 20mA  
Iin=TB1-3 GND=TB1-4  
STOP  
Advance to  
Calibrate ch2 0mA  
47  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.8  
Calibrate ch2 0mA To Calibrate: Connect Current Source (+)  
Iin=TB1-8 GND=TB1-4 TB1-8, (-) TB1-4. Input 0mA and press Enter.  
Calibrate CH2 0mA  
Submenu Group  
ENTER  
Calibrate ch2 0mA This message is displayed during calibration.  
0 CALIBRATING ——  
Calibrate ch2 0mA This message is displayed when the 0mA  
*** DONE ***  
calibration is finished.  
The display will automatically return to the  
Calibrate ch2 0mA Calibrate CH2 0mA submenu. Press the  
Iin=TB1-8 GND=TB1-4 Down arrow key to advance to the CH2 20mA  
calibration.  
STOP  
Calibrate ch2 20mA To Calibrate: Connect Current Source (+)  
Iin=TB1-8 GND=TB1-4 TB1-8, (-) TB1-4. Input 20mA and press  
8.2.9  
Calibrate CH2 20mA  
Submenu Group  
Enter.  
ENTER  
Calibrate ch2 20mA This message is displayed during calibration.  
0 CALIBRATING ——  
Calibrate ch2 20mA This message is displayed when the 20mA  
*** DONE ***  
calibration is finished.  
Calibrate ch2 20mA The display will automatically return to the  
Iin=TB1-8 GND=TB1-4 Calibrate CH2 20mA submenu. Press the  
Down arrow key to advance to the CH1 0V  
STOP  
calibration.  
Advance to  
Calibrate ch1 0V  
48  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.10  
Calibrate CH1 0V  
Submenu Group  
To Calibrate: Connect Voltage Source (+)  
TB1-2, (-) TB1-4. Input 0V and press Enter.  
Calibrate ch1 0V  
Vin=TB1-2 GND=TB1-4  
ENTER  
This message is displayed during calibration.  
Calibrate ch1 0V  
0 CALIBRATING ——  
This message is displayed when the 0V  
calibration is finished.  
Calibrate ch1 0V  
*** DONE ***  
The display will automatically return to the  
Calibrate CH1 0V submenu. Press the Down  
arrow key to advance to the CH1 10V  
calibration.  
Calibrate ch1 0V  
Iin=TB1-2 GND=TB1-4  
STOP  
8.2.11  
Calibrate CH1 10V  
Submenu Group  
To Calibrate: Connect Voltage Source (+)  
TB1-2, (-) TB1-4. Input 10V and press Enter.  
Calibrate ch1 10V  
Iin=TB1-2 GND=TB1-4  
ENTER  
This message is displayed during calibration.  
Calibrate ch1 10V  
0 CALIBRATING ——  
This message is displayed when the 10V  
calibration is finished.  
Calibrate ch1 10V  
*** DONE ***  
The display will automatically return to the  
Calibrate CH1 10V submenu. Press the  
Down arrow key to advance to the CH2 0V  
calibration.  
Calibrate ch1 10V  
Iin=TB1-2 GND=TB1-4  
STOP  
Advance to  
Calibrate ch2 0V  
49  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.12  
Calibrate CH2 0V  
Submenu Group  
Calibrate ch2 0V  
Vin=TB1-5 GND=TB1-4  
To Calibrate: Connect Voltage Source (+)  
TB1-5, (-) TB1-4. Input 0V and press Enter.  
ENTER  
Calibrate ch2 0V  
0 CALIBRATING ——  
This message is displayed during calibration.  
Calibrate ch2 0V  
*** DONE ***  
This message is displayed when the 0V  
calibration is finished.  
The display will automatically return to the  
Calibrate CH2 0V top-level menu. Press the  
Down arrow key to advance to the CH2 10V  
calibration.  
Calibrate ch2 0V  
Iin=TB1-5 GND=TB1-4  
STOP  
Calibrate ch2 10V  
Iin=TB1-5 GND=TB1-4  
To Calibrate: Connect Voltage Source (+)  
TB1-5, (-) TB1-4. Input 10V and press Enter.  
8.2.13  
Calibrate CH2 10V  
Submenu Group  
ENTER  
Calibrate ch2 10V  
0 CALIBRATING ——  
This message is displayed during calibration.  
Calibrate ch2 10V  
*** DONE ***  
This message is displayed when the 10V  
calibration is finished.  
The display will automatically return to the  
Calibrate CH2 10V top-level menu. Press the  
Down arrow key to advance to the 100 ohm  
RTD calibration.  
Calibrate ch2 10V  
Iin=TB1-5 GND=TB1-4  
STOP  
Advance to  
Calibrate 100ohm RTD  
Calibrate 100ohm RTD  
JMP TB1-6,7 100R=7,8  
To Calibrate: Connect a jumper wire between  
TB1-6 and TB1-7, Place a 100 ohm 0.1%  
resistor between TB1-7 and TB1-8. Press  
enter to calibrate.  
8.2.14  
Calibrate 100 ohm  
RTD  
ENTER  
Submenu Group  
Calibrate 100ohm RTD  
0 CALIBRATING ——  
This message is displayed during calibration.  
Calibrate 100ohm RTD  
*** DONE ***  
This message is displayed when the RTD  
calibration is finished.  
Calibrate 100ohm RTD  
JMP TB1-6,7 100R=7,8  
The display will automatically return to the  
Calibrate 100 ohm RTD top-level menu.  
Press the Down arrow key to advance to the  
4mA out calibration.  
STOP  
Advance to  
Calibrate 4mA out  
50  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
Connect ammeter to (+) TB1-15, (-) TB1-16.  
8.2.15  
Calibrate 4mA Out  
Submenu Group  
Calibrate 0mA out  
+ TB1-15 - TB1-16 Press enter.  
ENTER  
To trim 0mA output: Press CLEAR to enable  
Calibrate 0mA out  
Enter mA: 0.00000  
editing and enter a small negative number (i.e. -  
0.100) to force a display reading, then clear and  
enter small quantity measured on your meter.  
ENTER  
Calibrate 0mA out  
The display will return to Calibrate 0mA out.  
+ TB1-15 - TB1-16 Press the down arrow key to advance to Cal.  
20mA out or repeat above if necessary.  
STOP  
8.2.16  
Calibrate 20mA Out  
Submenu Group  
Calibrate 20mA out  
+ TB1-15 - TB1-16 Press enter.  
Connect ammeter to (+) TB1-15, (-) TB1-16.  
ENTER  
Calibrate 20mA out  
Enter mA: 20.00000  
To trim 20mA output: Press CLEAR to enable  
editing and enter the current reading that is on  
the ammeter display. Press enter.  
ENTER  
Calibrate 20mA out  
The display will automatically return to the  
+ TB1-15 - TB1-16 Calibrate 20mA out submenu. Calibration is  
complete.  
MENU  
Calibrate Press the Menu key to go back to Calibrate  
top-level menu.  
8.2.17  
Analog In Test  
Submenu Group  
Analog In Test  
Press enter to test the analog inputs.  
ENTER  
To check voltage input accuracy: Use TB1-4  
Analog In Test Volts as Reference Ground, input 0-10 Volts to TB1-  
T2:00.000 T5:00.000 2 and/or TB1-5. Display should show voltage  
STOP  
being input. Use voltage meter to verify input.  
To check current input accuracy: Use TB1-4  
Analog In Test mA as Reference Ground, input 0-20mA to TB1-3  
T3:00.000 T8:00.000 and/or TB1-8. Display should show current  
STOP  
being input. Use ammeter to verify input.  
To check RTD input accuracy: Connect a  
Analog In Test OHMS jumper wire between TB1-6 and TB1-7, Place  
RTD  
00.000 a 100 ohm 0.1% resistor between TB1-7 and  
TB1-8. Display should show 100 ohms ±0.1%.  
MENU  
Analog In Test  
Press Menu key to return to Analog In Test  
top-level menu.  
51  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.18  
Pulse input test  
Submenu Group  
Pulse input test  
Press Enter key to test the pulse input.  
ENTER  
2.5V  
10mV  
100mV  
START  
Pulse input test  
Trigger level 2.5V  
Use the Up/Down arrow keys to select the  
appropriate trigger level.  
STOP  
ENTER  
40Hz  
3KHz  
20kHz  
START  
Pulse input test  
count speed  
Use the Up/Down arrow keys to select the  
3kHz appropriate frequency range.  
STOP  
ENTER  
To check Pulse input accuracy: Use TB1-4 as  
reference ground, input a frequency on TB1-2.  
Pulse input test  
F1:  
0 F2:  
0
The display should show frequency being  
input. Use a frequency counter to verify input.  
MENU  
Pulse input test  
Analog out test  
Press Menu key to return to Pulse input test  
top-level menu.  
8.2.19  
Analog out test  
Submenu Group  
Press Enter to test the analog output.  
To simulate analog output: Connect an  
ammeter to (+) TB1-15, (-) TB1-16. Press the  
key under the desired setting to move the  
ENTER  
Analog out test  
*0 4 10 15 20 mA asterisk (*). The unit should output the  
selected current.  
MENU  
Analog out test  
Press Menu key to return to Analog out test  
top-level menu.  
Excitation out test  
Press Enter to test the excitation output.  
8.2.20  
Excitation out test  
Submenu Group  
To test the excitation output: Connect a  
voltmeter to (+) TB1-1, (-) TB1-4. Press the  
key under the desired setting to move the  
ENTER  
Excitation out test  
*5v  
12v  
24v asterisk (*). The unit should output the  
selected voltage.  
MENU  
Excitation out test  
Press Menu key to return to Excitation out test  
top-level menu.  
52  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.21  
Pulse out test  
Press Enter key to test the pulse output.  
Pulse out test  
Submenu Group  
To simulate a frequency on the pulse output:  
Connect a frequency counter to (+)TB1-13,  
(-)TB1-14. Press the key under the desired  
setting to move the asterisk (*). The unit  
should output the selected frequency.  
ENTER  
Pulse out test  
*0Hz 1Hz 10Hz 20Hz  
MENU  
Press Menu key to return to Pulse out test  
top-level menu.  
Pulse out test  
8.2.22  
Relay test  
Submenu Group  
Press Enter to test the relays.  
Relay Test  
ENTER  
To manually control the relay outputs: Press  
the key under the desired relay to toggle the  
relays On/Off. Use an ohmmeter to check the  
relay contacts.  
Rly1 Rly2 Rly3 Rly4  
Off Off Off Off  
MENU  
Press Menu key to return to Relay Test top-  
level menu.  
Relay Test  
8.2.23  
Control input test  
Submenu Group  
Press Enter to test the control inputs.  
Control inputs test  
ENTER  
To check the control inputs: Use TB1-12 as  
reference, input a DC signal to TB1-9, TB1-10  
and/or TB1-11, The Display will show ON  
when input is active, OFF when inactive.  
TB1-9 TB1-10 TB1-11  
Off Off Off  
MENU  
Press Menu key to return to control input test  
top-level menu.  
Control inputs test  
53  
FC-21 Flow Computer  
Sub-menus  
Display  
Notes  
8.2.24  
Battery Voltage  
test  
Battery Voltage Test Press Enter key to view the battery voltage.  
ENTER  
Submenu Group  
Battery Voltage Test The display will show the battery voltage.  
3.312 Volts  
Replace battery at 2.5 VDC or below.  
MENU  
Battery Voltage Test Press Menu key to return to battery voltage test  
top-level menu.  
8.2.25  
Data logger utility  
Submenu Group  
Data logger utility  
Press Enter to use data logger utility.  
ENTER  
Data logger utility  
The displays shows the number of Data Logs.  
Press the Down arrow key to advance to PRT  
(print) or CLR (clear).  
Log 10  
958 Max  
STOP  
Data logger utility  
Press PRINT key to output data logger logs to  
Log 00001 PRT CLR printer, Press CLEAR key to clear the data  
logger contents.  
MENU  
Data logger utility  
Press Menu key to return to Data logger utility  
top-level menu.  
54  
FC-21 Flow Computer  
8.3 Internal Fuse Replacement  
Instructions:  
1. Make sure you follow proper E.S.D. Precautions. All persons performing this  
replacement must follow proper grounding procedures.  
2. Turn the power to the unit off.  
3. Disconnect the two piece connector rear terminal block, leaving all connections in place.  
4. Remove the unit from the panel.  
5. Remove the four machine screws (see fig. 1) which hold the two sections of the case  
together.  
6. The rear section of the case should detach from the rest of the case. It may be  
necessary two cut the wiring label along the joint where the two sections connect. With  
the rear section of the case removed the fuse will be exposed (located near the rear  
terminal, AC connection).  
7. Locate the Fuse F1 (see fig. 2) and unplug the fuse from its socket.  
8. Insert the new fuse into the socket. Insure that the pins are fully inserted and straight.  
9. Reassemble the case and install the four machine screws which join the two sections of  
the case.  
10.Reinstall the unit into the panel.  
11. Reconnect the rear terminal block.  
12.Turn the unit back on.  
Fuse Specifications:  
110 VAC Power:  
220 VAC Power:  
160mA/250V, TD Wickman 19372-030-k or equivalent  
80mA/250V, TD Wickman 19372-026-k or equivalent  
12/24 VDC Power: 800mA/250V, TD Wickman 19374-046-k or equivalent  
fig. 1  
fig. 2  
Screws  
(4 places)  
fuse  
FUSE  
55  
FC-21 Flow Computer  
9. RS-232 Serial Port  
9.1 RS-232 Port Description:  
The FC-21 has a general purpose RS-232 Port which may be used for any one of the following  
purposes:  
Transaction Printing  
Data Logging  
Remote Metering by Modem (optional)  
Computer Communication Link  
Configuration by Computer  
Print System Setup  
Print Calibration/Malfunction History  
9.2 Instrument Setup by PC’s over Serial Port  
A Diskette program is provided with the FC-21 that enables the user to rapidly configure the FC-21  
using a Personal Computer. Included on the diskette are common instrument applications which may  
be used as a starting point for your application. This permits the user to have an excellent starting point  
and helps speed the user through the instrument setup.  
9.3 Operation of Serial Communication Port with Printers  
FC-21’s RS-232 channel supports a number of operating modes. One of these modes is intended to  
support operation with a printer in metering applications requiring transaction printing, data logging  
and/or printing of calibration and maintenance reports.  
For transaction printing, the user defines the items to be included in the printed document. The user  
can also select what initiates the transaction print generated as part of the setup of the instrument. The  
transaction document may be initiated via a front panel key depression, a remote contact closure, or  
upon completion of a batch.  
In data logging, the user defines the items to be included in each data log as a print list. The user can  
also select when or how often he wishes a data log to be made. This is done during the setup of the  
instrument as either a time of day or as a time interval between logging.  
The system setup and maintenance report list all the instrument setup parameters and usage for the  
current instrument configuration. In addition, the Audit trail information is presented as well as a status  
report listing any observed malfunctions which have not been corrected.  
The user initiates the printing of this report at a designated point in the menu by pressing the print key  
on the front panel.  
The user may specify a “next calibration date” for periodic maintenance. The unit will automatically  
remind the user that calibration is scheduled during instrument power up and in some printed documents  
after that date.  
9.4 FC-21 RS-232 Port Pinout  
5 4 3 2 1  
RS-232  
RS-485  
9 8 7 6  
5
4
3
2
1
5
4
3
2
1
9
8
7
6
9
8
7
6
23 24  
10 11 12 13 14 15 16 17 18 19 20 21 22  
1 Handshake Line  
2 Transmit  
1
2
3
4
5
6
7
8
9
3 Receive  
4 Do Not Use  
5 Ground  
6 Do Not Use  
7 Do Not Use  
8 Do Not Use  
9 Do Not Use  
56  
FC-21 Flow Computer  
10. RS-485 Serial Port (optional)  
10.1 RS-485 Port Description:  
The FC-21 has a an optional general purpose RS-485 Port which may be used for  
any one of the following purposes:  
Accessing Process Parameters  
Rate, Temperatures, Density, Setpoints, Month, Day, Year, Hour,  
Minutes, Seconds, etc.  
Accessing System Alarms  
System, Process, Self Test, Service Test Errors  
Accessing Totalizers  
Totalizer and Grand Totalizer  
Executing Various Action Routines  
Reset Alarms, Reset Totalizers, Print Transaction, Reset Error History,  
Start, Stop, Clear  
10.2 General  
The optional RS-485 card utilizes Modbus RTU protocol to access a variety of pro-  
cess parameters and totalizers. In addition, action routines can be executed. For  
further information, contact factory and request RS-485 Protocol manual for FC-21.  
10.3 Operation of Serial Communication Port with PC  
The flow computer's RS-485 channel supports a number of Modbus RTU com-  
mands. Refer to port pinout (below) for wiring details. Modbus RTU drivers are  
available from third party sources for a variety of Man Machine Interface software for  
IBM compatible PC's.  
The user reads and writes information from/to the RS-485 using the Modbus RTU  
commands. The FC-21 then responds to these information and command requests.  
Process variables and totalizers are read in register pairs in floating point format.  
Time and date are read as a series of integer register values. Alarms are individually  
read as coils. Action routines are initiated by writing to coils.  
10.4 FC-21 RS-485 Port Pinout  
1 Ground  
2 Ground  
3 Ground  
5 4 3 2 1  
RS-232  
RS-485  
5
4
3
2
1
5
4
3
2
1
4 TX/RX (+)  
9
8
7
6
9
8
7
6
9 8 7 6  
5 TX/RX (-)  
23 24  
10 11 12 13 14 15 16 17 18 19 20 21 22  
1
2
3
4
5
6
7
8
9
6 Do Not Use  
7 Terminating Resistor (180 )  
8 TX/RX (+)  
9 TX/RX (-)  
57  
FC-21 Flow Computer  
11. Flow Computer Setup Software  
The FC-21 setup program provides for configuring, monitoring and controlling a FC-  
21 unit.  
Sample applications are stored in disk files. The setup program calls these  
Templates. You can store the setup from the program’s memory to either the FC-21  
(Downloading the file) or to a disk file (Saving the file) for later usage. Similarly you  
can load the setup in program memory from either a disk file (Opening a file) or from  
the FC-21 unit (Uploading a file).  
The program can monitor outputs from the unit while it is running.  
The program can reset alarms and totalizers.  
For assistance there are mini-helps at the bottom of each screen in the program.  
There is also context sensitive help available for each screen accessible by pressing  
the F1 key.  
11.1 System Requirements:  
IBM PC or compatible with 386 or higher class microprocessor  
4 MB RAM  
3 MB free disk space  
VGA or higher color monitor at 640 x 480  
Microsoft® Windows™ 3.1 or 3.11 or Windows 95™  
Communication Port - RS-232  
RS-232 Cable  
11.2 Cable and Wiring Requirements:  
The serial communication port on your PC is either a 25 pin or 9 pin connector. No  
cabling is supplied with the setup software. A cable must be purchased separately or  
made by the user. It is recommended to purchase a modem cable which matches  
the available communication port on you PC and a 9 pin male connection for the FC-  
21 serial port.  
11.3 Installation for Windows™ 3.1 or 3.11  
The Setup Software includes an installation program which copies the software to  
your hard drive.  
Insert Setup Disk 1 in a floppy drive.  
In the Program Manager, click File, and then select Run.  
NOTE: For Windows 95™ Click the Start button, select Run and proceed  
as follows:  
Type the floppy drive letter followed by a colon (:) and a backslash (\), and the word  
setup. For Example:  
a:\setup  
Follow the instructions on your screen.  
58  
FC-21 Flow Computer  
11.4 Using the Flow Computer Setup Software  
The setup software window consists of several menu “Tabs”. Each tab is organized  
into groups containing various configuration and/or monitoring functions. To view  
the tab windows, simply click on the tab. The previous tab window will be hidden as  
the new tab window is brought to the foreground.  
11.5 File Tab  
The File Tab has three sections. Any of the options on this tab can also be  
accessed from the File submenu.  
The Template Section provides for opening and saving templates. The Save and  
Save As buttons provide the standard Windows functionality for dealing with files.  
The Load button is used to open existing templates.  
There are two additional menu items available only from the File menu: Create new  
file and Templates.  
The Create new file, option allows for creating custom templates using the existing  
template in memory as the starting point. Assign a new name for this template. The  
template will be saved under this new name.  
The Template option will bring up a list of predefined templates that can be loaded  
into the program. These predefined templates are useful as a starting point when  
defining custom templates.  
A typical scenario using the setup program would be the following:  
• Open up a predefined template from the supplied list  
• Choose ‘Save As’ to save this to a new file name  
• Proceed to customize the template by making any changes that are needed  
• Save the template to disk (if you want to reuse this template)  
• Download the template to an attached unit.  
The Communications with FC-21 Section allows the user to upload a template file  
from the unit, download the program’s current template to the unit or Compare the  
program’s current template with the unit.  
The Print (report) Section allows the user to:  
1. Configure the current Windows printer through the Select Printer option.  
2. Print a Maintenance Report through the PC's printer using the Print  
Maintenance option.  
3. Print the current template through the PC's printer using Print Setup option.  
11.6 Setup Tab  
The Setup tab is where majority of the FC-21 instrument setup modifications are  
done. The Setup tab is divided into five sections.  
System Section: Parameters, Display, Indicators  
Input Section:  
Flow, Fluid, Compensations, Control Inputs  
Output Section: Pulse, Currents  
Relay Section:  
Relays  
Other Settings Section: Administration, Communication, Printing  
NOTE: Many setup items are enabled or disabled depending on previous setup  
selections, It is important to work your way through the above list in the  
order shown. Be sure to verify your selections when you are through  
programming to insure that no settings were changed automatically.  
59  
FC-21 Flow Computer  
11.7 View Tab  
The View Tab screen allows for viewing selected group items on the PC in a similar  
format as shown on the unit display. Data from the following groups can be viewed  
in the List of Values section:  
Process Parameters (i.e. rate, temperature)  
Totalizers (i.e. total, grand total)  
The setup software assumes the current setup has been uploaded from the flow  
computer into the PC. It is important that the setup program and the FC-21 unit are  
using the same setup information at all times or the data will be inconsistent. It is  
best to upload or download the setup before using this feature.  
To start the viewer, first check the boxes of items to view and then click the start  
button. The data will appear in the appropriate sections and will be continuously  
updated. The refresh rate is dependent on the number of items that are being  
viewed and the baud rate of the connection. Data in the List of Values section can  
be collapsed by clicking on the ‘minus’ sign in front of the group title. The data can  
be expanded by clicking on the ‘plus’ sign in front of the group title. If a group is  
collapsed and data in the group changes on refresh, the group will automatically  
expand. Changing the view items requires stopping the current viewing, checking  
the new selections and then restarting the viewer.  
If communication errors occur while reading data from the FC-21 device, the word  
‘Error’ will appear in place of the actual value. If the connection to the FC-21 is lost,  
the viewer will time out with a message saying the device is not responding.  
The viewer will attempt to communicate with the FC-21 device matching the device  
ID set in the communications screen. If you are having trouble establishing  
communication, compare settings for the PC and the flow computer. Also verify the  
connections between the PC and flow computer.  
11.8 Misc. Tab  
This tab has three sections: Tools, Actions and Options.  
The tools section contains various system administration activities such as creating/  
modifying the initial sign-on screen or calibration, service test etc.  
Create Sign-on, Create Print Header, Calibration, Service Test  
The Actions section is used to send commands to the FC-21 unit.  
Reset Totalizers, Reset Alarms  
The Options section has the following selections:  
Linearization, PC Communication  
Additional capabilities may be provided in the future.  
NOTE: Future options appear as disabled buttons on the screen.  
60  
FC-21 Flow Computer  
12. Glossary Of Terms  
Acknowledge & Clear Alarms  
Acknowledge is used to clear alarm relays and remove any visual alarm messages from the display. In  
the run mode, press the ENTER key or activate CONTROL INPUT 3 (if set for ACK) to momentarily  
clear alarms and alarm messages. Alarms will reassert themselves if alarm conditions are still present.  
Analog Output  
The analog signal (4-20mA) that is generated by the FC-21. It can correspond to the Rate, Total,  
Temperature or Density. This output is used primarily for transmission of process information to remote  
systems.  
Audit Trail  
The audit trail is used to track the number of changes made to the units setup program.  
Auto Batch Restart  
The Auto Batch Restart function allows the user to set an amount of time to automatically restart a batch  
after the completion of a batch. This time can be set from 1 to 99 seconds.  
Batch Count Mode  
Batch Count Mode specifies the user preference for count direction. The "Up" selection begins with a  
value of "0" and counts up until the batch size is reached. The "Down" selection begins with a value  
equal to the desired batch size and counts down to "0".  
Batch Overrun  
The FC-21 offers a batch overrun compensation routine. If batch overrun occurs due to slow valve  
response time, the unit will compensate for the overrun amount on the next batch. This feature can be  
disabled if desired.  
Batcher  
An instrument which controls the dispensing of desired batch amounts. Liquid batching systems are  
usually comprised of a batch controller (batcher), flowmeter and control valve. The batcher opens and  
closes the valve through the use of relays and measures the amounts of liquid being dispensed via the  
flowmeter.  
Baud Rate  
The speed of serial communication transmissions, expressed in bits per second.  
C-Factor (Fluid Expansion Factor)  
A parameter in a flow equation which is used to describe the relationship between density or volume and  
temperature changes.  
Corrected Volume Flow  
The equivalently volume at a reference temperature condition which involves the measurement of liquid  
volume flow using a flow sensor and temperature sensor to compensate for thermal expansion.  
Custody Transfer  
Weights and Measure metering codes often specify several requirements for instruments and  
mechanisms to prevent and track changes in the setup of an instrument which may be used in the  
commercial sale of goods. The FC-21 tracks changes via the Audit Trail.  
Data Logger  
The capturing of information for later use and the mechanism for specifying the conditions where a  
capture should be made.  
DC Output / Excitation Voltage  
An on-board DC power supply used to power peripheral sensors. The FC-21 offers excitation voltages  
of 5VDC, 12VDC or 24VDC when powered by AC voltage.  
Default Value  
The value to be used by the instrument if a sensor failure or out of ranch signal is detected.  
Expansion Factor  
See C-Factor  
Flow Alarm  
A visual indication that the volumetric flowrate is above or below the flow alarm setpoint specified by  
the user.  
61  
FC-21 Flow Computer  
12. Glossary Of Terms (Continued)  
Flow Signal Timeout  
The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds. If a batch is “Filling” and  
zero flow persists for more than the user entered time then the batch will be aborted. This prevents over  
flows due to faulty flow sensors and/or wiring.  
Flow Equation  
A flow control expression or algorithm describing a mathematical equation to be solved by a flow  
computer in the desired application.  
Follow, Alarm  
Alarm relays which are non latching and whose output state is based solely on the comparison of the  
current process value and the alarm setpoint (trip point).  
Function Key  
A key on a push-button panel or keyboard (whose function is described by the key label) used to  
perform an instrument function or special routine.  
Handshake  
A means of controlling the information flow between two pieces of equipment to prevent the sending  
device from transmitting information at a rate faster than what can be accepted by the receiver.  
Hysteresis  
The relay hysteresis is a "dead band" setting which allows the relay to remain energized for a given  
amount below the setpoint. This is used to prevent relay chatter when the process value is near the  
setpoint value.  
Example: If the Preset is set at 100, and the hysteresis is set at 10, the relay will energize when the rate,  
temp or dens. reaches 100, the relay will remain energized until the reading falls below 90.  
Input Termination  
Input signal lines on digital inputs often require pullup or pulldown resistor configurations to operate  
properly with different sensor configurations. The FC-21 contains such resistors and may be enabled via  
the setup menu.  
Inhibit Totalizer  
"Inhibit Total" is a Control Input 1 setting that is used to stop the totalization. If enabled, a voltage level  
on control input 1 will inhibit the total as long as the voltage is present. This feature is useful during  
meter proving and in applications that provide a sensor to signal the flow computer when fluid is  
present.  
K-Factor  
A scaling factor derived from the pulses produced by a flowmeter output, expressed in pulses per unit  
(i.e. pulses/gallon)  
LCD  
Abbreviation for: Liquid Crystal Display  
Limit Setpoint  
An alarm trip point setting which specifies the value or magnitude of a process parameter necessary to  
activate an alarm indicator or control relay.  
Linear Flowmeter  
A flow measurement device whose output is proportional to flow.  
Linearization  
The mathematical correction of a nonlinear device. The FC-21 uses a linearization Table which is made  
up of input/output values and makes interpolations of the table to arrive at a "linearized" measurement.  
LinTbl  
Abbreviation for Linearization Table.  
Low Flow Cutoff  
A value set at which any flow measurements read below this value will be ignored.  
Low Pass Filter  
A low pass filter passes low input frequencies while blocking high frequencies. In the FC-21, this is the  
maximum input count speed to be encountered in an application. It is expressed in counts per second  
(Hz).  
Mass Flow  
62  
FC-21 Flow Computer  
12. Glossary Of Terms (Continued)  
Mass Flow is inferred by the volumetric flow and density (or implied density) of a fluid.  
Maximum Batch Preset  
The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered  
by the operator. If an operator should try to program a batch higher then this value, the unit will not allow  
the value to be entered and will prompt the user with an error message saying that the Maximum Batch  
Preset has been exceeded.  
Maximum Drain Time  
The unit declares that a batch is “done” when the flow rate equals “0”. A flow rate may be present long  
after the Preset Relay de-energizes due to slow reacting valves or leaky valves. The Maximum Drain  
Time allows the user to enter an amount of time (0 to 99 seconds) to wait before declaring “Batch Done”.  
After the Preset Batch quantity is reached, the unit will declare “Batch Done” when the flow rate is “0” or  
the Maximum Drain Time has expired. The batch data will then be available for printing and datalogging.  
Max Window  
The max. window time sets the maximum sample time (1 to 99 sec) for the ratemeter.  
Modem Init Master  
The "Modem Init Master" menu allows the user to select whether the unit will engage in a configuration  
conversation with the modem on power up or impart no setup information to the modem and use it "as  
is". For most users it is recommended to choose "yes" for "Modem Init Master".  
Orifice Plate Flowmeter  
A class of flow measurement devices where the measured signal (differential pressure) has a square law  
relationship to flow.  
Parity  
A method for detecting errors in transmissions of serial communications data.  
Preset  
A set point used to trigger the relay outputs of the FC-21.  
Print Interval  
The print interval allows the FC-21 to transmit information to the serial port at selectable time intervals.  
Private Code  
An operator password code which authorizes changes to the setup of the instrument but blocks access to  
the Service/Calibration/Test mode. The private code also blocks the clearing of the Grand Total.  
Process Parameters  
Any sensor information which has been scaled to engineering units including Flow, Temperature and  
Density.  
Pulldown (Input Termination)  
The termination of an input at which the input is pulled down to ground through a resistor. Inputs that  
are terminated by this method need to be driven high with a positive voltage pulse.  
Pullup (Input Termination)  
The termination of an input at which the input is pulled up to a positive voltage through a resistor.  
Inputs that are terminated by this method need to be pulled low with a sinking current or contact to  
ground .  
Pulse Output  
The pulse output of the FC-21 is available for remote accumulation of the total or sent to peripheral  
devices, such as a PLC. The output can be scaled using the Pulse Output Scaling Constant.  
Quad  
Abbreviation for Quadrature. Quadrature signals are used for direction control. Two flowmeter signals  
are output with a 90° phase shift. The counter counts UP when channel A precedes channel B, and  
counts DOWN when Channel A lags Channel B.  
Quick Setup  
A utility that provides for rapid configuration of an instrument. The FC-21 quick setup provides the  
63  
FC-21 Flow Computer  
12. Glossary Of Terms (Continued)  
following:  
1) Prompts the user for only critical information.  
2) Automatically sets specifications to common uses.  
After following the Quick Setup procedure, the unit will be operational to perform the basic  
measurement. The setup can be further customized using the setup menus.  
Quick Update %  
This feature is used to disable the rate averaging filter when a significant change in the flow rate occurs.  
The user can enter the percent of change needed to be detected to disable the averaging feature. This is  
especially useful during start-up and shutdown of flow.  
Rate Averaging Filter  
The rate averaging filter is used to stabilize fluctuating rate displays. Higher settings provide more  
averaging for a more stable display. Derived from the equation:  
(OLD DATA x "Avg. Filter" + NEW DATA)  
("Avg. Filter" + 1)  
Ratemeter  
Any device used to display the speed of a process. The ratemeter in the FC-21 displays flow rate.  
Ref. Dens.  
Abbreviation for Reference Density. This is the fluid density at reference temperature.  
Ref. Temp.  
Abbreviation for Reference Temperature. This represents the base or reference condition to which  
corrected flow will be computed.  
Reset/Start Control Input  
In a batching system, a single operator activation of the START key or Control Input 1 will reset the  
total then start the batch process.  
Single_Pulse  
The Single_Pulse setting is used for flowmeters with single pulse outputs.  
Slow Start Quantity  
The Slow Start Quantity is a function that allows an amount to be entered for a Slow Start up. This  
function requires two stage valve control. RLY 1 (slow flow) will energize for Slow Start and RLY 2 (fast  
flow) will energize after the Slow Start Quantity has been delivered. This helps reduce turbulence when  
filling an empty container.  
Sqrt  
Abbreviation for Square Root Extraction. Used for flow elements using differential pressure  
measurements.  
Stop/Reset Control Input  
In a batching system, a single operator activation of the STOP key or Control Input 2 will stop the batch  
process then reset the total.  
Time Constant  
A damping factor for an averaging filter for the analog output. (see also Rate Averaging Filter)  
Totalizer  
Any device which accumulates and displays a total count.  
UVC  
Abbreviation for Universal Viscosity Curve. A presentation of the combined flowrate/viscosity  
calibration for a turbine flowmeter.  
VFD  
Abbreviation for Vacuum Fluorescent Display  
Visc Coef  
Abbreviation for Viscosity Coefficient. One or more coefficients in an equation used to describe the  
viscosity as a function of temperature for a fluid.  
Volume Flow  
The measurement of volumetric flow.  
64  
FC-21 Flow Computer  
13. Diagnosis and Troubleshooting  
13.1 Response of FC-21 on Error or Alarm:  
Error and warning indications which occur during operation are indicated  
in the RUN mode alternately with the measured values. The FC-21  
Flow Computer has three types of error:  
TYPE OF ERROR  
DESCRIPTION  
Sensor/Process Alarms  
Errors detected due to sensor  
failure or process alarm  
conditions  
Self Test Errors  
System Alarms  
Errors detected during self test.  
Errors detected due to system  
failure  
Some alarms are self clearing. Other alarms require the user to  
acknowledge and clear the alarm. Press the ENTER button to  
acknowledged and clear alarms. Alarms may reassert themselves if  
the alarm condition is still present.  
NOTE: A historical error alarm log is available in the "Test Mode".  
The following descriptions suggest possible causes and corrective  
actions for each alarm message.  
65  
FC-21 Flow Computer  
13.2 Diagnosis Flow Chart and Troubleshooting  
All instruments undergo various stages of quality control during pro-  
duction. The last of these stages is a complete calibration carried out  
on state-of-the-art calibration rigs.  
A summary of possible causes is given below to help you identify  
faults.  
Is there an input power  
supply voltage across  
Terminals 23 and 24?  
Check the connections  
according to the circuit  
diagrams.  
No  
Yes  
Check junction box fuses.  
Is the Display Backlight  
Visible?  
Check/Replace internal  
fuse. If fuse is OK,  
Factory Service Required.  
No  
No  
Yes  
The display may not be  
visible with ambient  
temperatures below -10 °C  
Allow the instrument to  
warm up.  
Are the Display  
Characters Visible?  
Yes  
Contact factory if  
necessary  
Check line voltage.  
If voltage is OK,  
Factory Service Required.  
Is there a black bar  
across the display?  
Yes  
No  
Does the display  
alternate between blank  
and sign on message?  
Check line voltage.  
If voltage is OK,  
Factory Service Required.  
Yes  
Yes  
No  
Does the display show  
an error message?  
See section 12.3 for  
cause and remedy.  
No  
No system or process  
errors present.  
66  
FC-21 Flow Computer  
13.3 Error & Warning Messages:  
13.3.1  
Error/Warning Message  
Cause  
Remedy  
Sensor/Process Alarms  
TOTALIZER ROLLOVER  
AUX INPUT TOO LOW  
Displayed when totalizer  
rolls over  
Acknowledge  
Rollover,  
Remedy not required  
4-20 mA Input current at aux • Check wiring  
input smaller than 3.5 mA:  
• Faulty Wiring  
• Check function of  
sensor  
• Transmitter not set to "4-20  
mA"  
• Transmitter defective  
RTD OUT OF RANGE  
Input current at RTD input  
too low:  
• Faulty wiring  
• Check wiring  
• Check function of  
RTD sensor  
• RTD defective  
RATE OVERFLOW ERROR Pulse counter overflowed.  
• Report error to  
factory  
The totalizer may have lost  
counts.  
• Check application  
conditions  
• Check wiring  
PULSE OUT OVERFLOW  
Calculated pulse frequency  
too large:  
• Adjust pulse value  
• Adjust pulse width  
• Pulse width setting too long • Check process  
• Larger pulse scaler needed  
conditions  
FLOW RATE ALARM LOW Limit value exceeded.  
FLOW RATE ALARM HIGH  
• Check application if  
necessary  
• Check limit value  
• Adjust the limit  
value if required  
TEMP ALARM LOW  
TEMP ALARM HIGH  
DENSITY ALARM LOW  
DENSITY ALARM HIGH  
BATCH OVERRUN ALARM Batch size exceeded by  
• Check valves in  
system for proper  
operation and/or  
leaks  
more than set limit.  
• Check limit value  
• Adjust the limit  
value if required  
MODEM NOT PRESENT  
The setup expects modem  
usage and a modem is not  
responding.  
• Check setup for  
proper baud rate,  
parity, etc.  
• Check modem  
connection and  
cycle power to  
SUPERtrol  
• Replace modem  
SOFTWARE ERROR RESET The setup expects modem  
usage and a modem is not  
• Check setup for  
proper baud rate,  
parity, etc.  
responding.  
• Check modem  
connection and  
cycle power to  
SUPERtrol  
• Replace modem  
EXTENDED PFI LOCKUP  
Unit was operated with an  
input power level lower than  
safe operating range for an  
extended period of time.  
• Check data in unit.  
Totalizer may have  
inaccuracies  
• Investigate  
brownout cause.  
67  
FC-21 Flow Computer  
13.3 Error & Warning Messages: (Continued)  
13.3.2  
Self Test Alarms  
Error/Warning Message  
FLOW INPUT TOO HIGH  
Cause  
Remedy  
Analog input signal of the  
flow input exceeded by more  
than 3%:  
• Sensor overranged  
• Incorrect full scale setting  
of flowmeter  
• Check analog  
signal range  
• Check the  
application  
conditions  
• Check wiring  
• Function error in  
transmitter or faulty wiring  
AUX INPUT TOO HIGH  
Analog input signal of the  
auxiliary input exceeded by  
more than 3%:  
• Sensor overranged  
• Incorrect full scale setting  
of transmitter  
• Check analog  
signal range  
• Check the  
application  
conditions  
• Check wiring  
• Function error in  
transmitter or faulty wiring  
FLOW INPUT TOO LOW  
Analog input signal of the  
flow input fell below the low  
scale range by more than  
3% of full scale value:  
• Flowmeter not set to 4-20  
mA  
• Check wiring  
• Check calibration of  
flowmeter  
• Check function of  
flowmeter  
• Function error in  
transmitter or faulty wiring  
BATTERY LOW WARNING Battery voltage too low  
• Replace Battery  
• Consult Factory for  
service information  
A to D NOT CONVERTING Fault in analog/digital  
• Unit may self  
correct, Press  
ENTER to  
converter  
acknowledge &  
clear alarm  
• If error reasserts,  
factory service is  
required  
TIME CLOCK ERROR  
The correct time/date is no  
longer shown  
• Re-enter time and  
date.  
• If error occurs  
again contact  
factory  
CAL CHECKSUM ERROR  
Calibration constants have  
been corrupted  
• Report error to  
factory  
SETUP CHECKSUM ERROR The units setup has been  
• Report error to  
factory  
corrupted  
68  
FC-21 Flow Computer  
APPENDIX A  
69  
WARRANTY/DISCLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a  
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month  
grace period to the normal one (1) year product warranty to cover handling and shipping time. This  
ensures that OMEGA’s customers receive maximum coverage on each product.  
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service  
Department will issue an Authorized Return (AR) number immediately upon phone or written request.  
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no  
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,  
including but not limited to mishandling, improper interfacing, operation outside of design limits,  
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of  
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;  
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating  
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not  
limited to contact points, fuses, and triacs.  
OMEGA is pleased to offer suggestions on the use of its various products. However,  
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any  
damages that result from the use of its products in accordance with information provided by  
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be  
as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR  
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,  
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND  
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF  
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA with respect to this order, whether based on contract, warranty, negligence,  
indemnification, strict liability or otherwise, shall not exceed the purchase price of the  
component upon which liability is based. In no event shall OMEGA be liable for  
consequential, incidental or special damages.  
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical  
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or  
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility  
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify  
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the  
Product(s) in such a manner.  
RETURN REQUESTS/INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN  
(AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID  
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return  
package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent  
breakage in transit.  
FOR WARRANTY RETURNS, please have the  
following information available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
information available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
1. Purchase Order number to cover the COST  
of the repair,  
2. Model and serial number of the product under  
warranty, and  
3. Repair instructions and/or specific problems  
relative to the product.  
2. Model and serial number of the product, and  
3. Repair instructions and/or specific problems  
relative to the product.  
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords  
our customers the latest in technology and engineering.  
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.  
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,  
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the  
prior written consent of OMEGA ENGINEERING, INC.  
OMEGAnet® Online Service  
Internet e-mail  
Servicing North America:  
USA:  
ISO 9001 Certified  
One Omega Drive, P.O. Box 4047  
Stamford CT 06907-0047  
TEL: (203) 359-1660  
FAX: (203) 359-7700  
Canada:  
976 Bergar  
Laval (Quebec) H7L 5A1  
TEL: (514) 856-6928  
FAX: (514) 856-6886  
For immediate technical or application assistance:  
®
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA  
®
Customer Service: 1-800-622-2378 / 1-800-622-BEST  
®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN  
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA  
Mexico:  
En Espan˜ol: (001) 203-359-7803  
FAX: (001) 203-359-7807  
Servicing Europe:  
Benelux:  
Postbus 8034, 1180 LA Amstelveen, The Netherlands  
TEL: +31 (0)20 3472121  
FAX: +31 (0)20 6434643  
Toll Free in Benelux: 0800 0993344  
Czech Republic:  
France:  
Rudé armády 1868, 733 01 Karviná 8  
TEL: +420 (0)69 6311899  
Toll Free: 0800-1-66342  
FAX: +420 (0)69 6311114  
9, rue Denis Papin, 78190 Trappes  
TEL: +33 (0)130 621 400  
FAX: +33 (0)130 699 120  
Toll Free in France: 0800-4-06342  
Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany  
TEL: +49 (0)7056 9398-0  
FAX: +49 (0)7056 9398-29  
Toll Free in Germany: 0800 639 7678  
United Kingdom: One Omega Drive, River Bend Technology Centre  
ISO 9002 Certified  
Northbank, Irlam, Manchester  
M44 5BD United Kingdom  
TEL: +44 (0)161 777 6611  
FAX: +44 (0)161 777 6622  
Toll Free in United Kingdom: 0800-488-488  
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that  
apply. OMEGA is constantly pursuing certification of its products to the European New Approach  
Directives. OMEGA will add the CE mark to every appropriate device upon certification.  
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts  
no liability for any errors it contains, and reserves the right to alter specifications without notice.  
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.  

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