Hach 6120118 User Manual

Catalog Number 6120118  
Digital PC sc and RC sc ¾-inch  
Combination pH/ORP Sensor  
USER MANUAL  
October 2005, Edition 4  
©Hach Company, 2004–2005. All rights reserved. Printed in the U.S.A. eac/dp  
Table of Contents  
Section 1 Specifications......................................................................................................................................... 5  
Section 2 General Information............................................................................................................................... 7  
Section 3 Installation ............................................................................................................................................ 11  
Section 4 User Interface and Navigation ............................................................................................................ 19  
Section 5 Operation .............................................................................................................................................. 25  
Section 6 Maintenance ......................................................................................................................................... 33  
Section 7 Troubleshooting ................................................................................................................................... 35  
3
Table of Contents  
Section 8 Replacement Parts and Accessories..................................................................................................37  
Section 9 How to Order.........................................................................................................................................39  
Section 10 Repair Service.....................................................................................................................................40  
Section 11 Limited Warranty ................................................................................................................................41  
Section 12 Compliance Information ....................................................................................................................43  
4
Section 1 Specifications  
Specifications are subject to change without notice.  
Table 1 Combination pH and ORP Sensor Specifications  
Components  
Corrosion-resistant materials, fully-immersible probe with 4.6 m (15 ft) cable  
Measuring Range (pH)  
Measuring Range (ORP)  
0 to 14 pH  
–2000 to +2000 mV  
Measuring Range (Temperature)  
Probe Operating Temperature  
Probe Storage Temperature  
0 to 105 °C (32 to 221 °F)  
0 to 105 °C (32 to 221 °F)  
–30 to 70 °C (–22 to 158 °F); 0 to 95% relative humidity, non-condensing  
pH: Pt 1000 ohm RTD  
ORP: N/A  
Temperature Compensation  
Accuracy (Analyzer only)  
pH: 0.1% of span  
ORP: Limited to calibration solution accuracy (± 20 mV)  
Stability (Analyzer only)  
0.05% or span per 24 hours, non-cumulative  
0.1% of span or better  
Repeatability (Analyzer only)  
Temperature Accuracy (Analyzer only) ±0.5 °C (±0.9 °F)  
Temperature Drift (Analyzer only)  
Calibration Methods (Analyzer only)  
Zero and Span: less than 0.03% of span per °C  
Two point automatic, one point automatic, two point manual, one point manual  
Submersible to 107 m (350 ft)/1050 kPa (150 psi)  
Maximum Probe Immersion Depth/  
Pressure  
Sensor Interface  
Probe Cable Length  
Probe Weight  
Modbus from digital gateway  
4.6 m (15 ft)  
Depends on selected sensor  
Probe Dimensions  
Table 2 Digital Gateway Specifications  
Weight  
145 g (5 oz)  
3
Dimensions  
17.5 x 3.4 cm (7 x 1 /8 in.)  
Operating Temperature  
–20 to 60 °C (–4 to 140 °F)  
5
   
Section 2 General Information  
2.1 Safety Information  
Please read this entire manual before unpacking, setting up, or operating this equipment.  
Pay attention to all danger and caution statements. Failure to do so could result in serious  
injury to the operator or damage to the equipment.  
To ensure that the protection provided by this equipment is not impaired, do not use or  
install this equipment in any manner other than that specified in this manual.  
This product is acceptable for use in a Hazardous Location when used with an  
sc100 Controller and installed per Control Drawing 58600-78 as described in the  
sc100 Controller Manual, Cat. No. 5860018.  
2.1.1 Use of Hazard Information  
DANGER  
Indicates a potentially or imminently hazardous situation which, if not avoided,  
could result in death or serious injury.  
CAUTION  
Indicates a potentially hazardous situation that may result in minor or  
moderate injury.  
Important Note: Information that requires special emphasis.  
Note: Information that supplements points in the main text.  
2.1.2 Precautionary Labels  
Read all labels and tags attached to the instrument. Personal injury or damage to the  
instrument could occur if not observed.  
This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.  
This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or  
electrocution exists.  
This symbol, if noted on the product, indicates the need for protective eye wear.  
This symbol, when noted on the product, identifies the location of the connection for Protective Earth (ground).  
This symbol, when noted on the product, identifies the location of a fuse or current limiting device.  
7
         
General Information  
2.2 General Sensor Information  
Optional equipment, such as mounting hardware for the probe, is supplied with  
instructions for all user installation tasks. Several mounting options are available, allowing  
the probe to be adapted for use in many different applications.  
2.2.1 Sensor Body Styles  
Combination pH and ORP sensors are available in three body styles:  
Convertible Body Style (Figure 1 and Figure 2)— has ¾-in. NPT threads at both  
ends of the body for mounting in any of the following configurations:  
into a standard ¾-in. NPT pipe tee  
onto the end of a pipe for immersion into a vessel  
Insertion Body Style (Figure 3)— for mounting into the pipe adapter of a ball valve  
hardware assembly. This hardware enables the sensor to be inserted into or retracted  
from the process without stopping the process flow.  
Sanitary Body Style (Figure 4)— features a built-in 2-in. flange for mounting into a  
2-in. sanitary tee. Included with the sanitary-style sensor is a special cap and EDPM  
compound gasket for use with the sanitary hardware.  
Figure 1  
Convertible Style Sensor with Flat Electrode  
¾-inch NPT  
Typical  
22.2 mm (0.875 inch)  
22.9 mm (0.90 inch)  
7.62 mm  
(1.30 inches)  
149.9 mm (5.9 inches)  
Figure 2  
Convertible-style Sensor with Dome Electrode  
¾-inch NPT  
Typical  
22.2 mm (0.875 inch)  
22.9 mm (0.90 inch)  
7.62 mm  
(1.30 inches)  
149.9 mm (5.9 inches)  
8
         
General Information  
Figure 3  
Insertion Style Sensor with Domed Electrode  
22.2 mm (0.875 inches)  
149.9 mm (5.9 inches)  
Figure 4  
Sanitary-style Sensor  
22.2 mm (0.875 inches)  
49.1 mm (1.96 inches)  
22 mm (0.87 inches)  
88.9 mm (3.5 inches)  
187.3 mm (7.37 inches)  
2.3 The Digital Gateway  
The digital gateway was developed to provide a means to use existing analog sensors with  
the new digital controllers. The gateway contains all the necessary software and hardware  
to interface with the controller and output a digital signal.  
2.4 Operating Precaution  
Before placing the pH or ORP sensor into operation, remove the protective cap to expose  
the process electrode and reference junction. Save the protective cap for future use.  
For short-term storage (when sensor is out of the process for more than one hour), fill the  
protective cap with pH 4 buffer or DI water and place the cap back on the sensor. Keeping  
the process electrode and reference junction moist will avoid slow response when the  
sensor is placed back in operation.  
For extended storage, repeat the short-term storage procedure every 2 to 4 weeks,  
depending on the surrounding environmental conditions.  
CAUTION  
If the pH process electrode breaks, handle the sensor very carefully to  
prevent injury.  
The process electrode at the pH sensor tip has a glass bulb, which can break. Do not  
subject this electrode to abrupt impact or other mechanical abuse.  
The gold or platinum process electrode at the ORP sensor tip has a glass shank (hidden  
by the salt bridge) which can break. Do not subject this electrode to impact or other  
mechanical abuse.  
9
         
Section 3 Installation  
DANGER  
Only qualified personnel should conduct the tasks described in this section of the  
manual.  
DANGER  
Seul un technicien qualifié peut effectuer les tâches d'installation décrites dans  
cette section du manuel.  
The Combination pH/ORP Sensor can be used with either an sc100 or sc1000 controller.  
Refer to section 3.2 on page 13 for sc100 installation instructions and section 3.3 on  
page 16 for sc1000 installation instructions.  
The sc sensor should be wired to the digital gateway before connecting the digital gateway  
to the sc100 or sc1000 Controller. The digital gateway is designed to provide a digital  
interface to the appropriate digital controller. Refer to section 3.1 for more information.  
3.1 Wiring the sc Sensor to the Digital Gateway  
DANGER  
The sc100 and certain versions of the sensor are suitable for use in Class 1,  
Division 2, Groups A, B, C, D Hazardous Locations . See Control Drawing 58600-78  
in the sc100 Controller Manual, Cat. No. 58600-18 for acceptable sensor versions  
and installation requirements.  
DANGER  
Le sc100 et certaines versions du capteur peuvent être utilisés dans des endroits  
dangereux de la Classe 1, Division 2, Groupes A, B, C, D. Reportez-vous au schéma  
de contrôle 58600-78 du Manuel du contrôleur sc100, Réf. 58600-18 pour connaître  
les versions des capteurs admises et les conditions d'installation.  
1. Route the cable from the sensor through the strain relief in the digital gateway then  
properly terminate the wire ends (see Figure 5).  
Note: Do not tighten the strain relief until the digital gateway is wired and the two halves are  
threaded securely together.  
2. Insert the wires as shown in Table 3 and Figure 6.  
3. Make sure the O-ring is properly installed between the two halves of the digital  
gateway and thread the two halves together. Hand tighten.  
4. Tighten the strain relief to secure the sensor cable.  
5. Connect the digital gateway to the controller.  
sc100 Non-hazardous Location–section 3.2.1.1 on page 13  
sc100 Hazardous Location—section 3.2.2.1 on page 16  
sc1000 Connection Instructions—Refer to section 3.3 on page 16.  
11  
   
Installation  
Figure 5  
Proper Wire Preparation and Insertion  
1
2
1. Strip ¼-inch of insulation.  
2. Seat insulation against connector with no bare wire exposed.  
Figure 6  
Wiring and Assembling the Digital Gateway  
1
2
3
4
5
6
7
METAL BRAID  
RED  
WHT  
CLEAR  
BLU  
8
9
10  
11  
12  
1. Digital gateway front  
2. O-ring  
7. Cord grip  
8. From sensor  
3. Sensor wire connector  
9. Insert wires into connector according to Table 3. Use the included 2 mm  
screwdriver (Cat. No. 6134300) to secure connections.  
4. Digital gateway back  
5. Cable bushing  
10. Screw back of digital gateway onto front.  
11. Push cable bushing and anti-rotation washer into back.  
12. Fasten cord grip securely. Assembly is complete.  
6. Anti-rotation washer  
12  
   
Installation  
Table 3 Wiring the Digital Gateway (Cat. No. 6120800)  
1
Sensor (wire color)  
Sensor Signal without Ground Rod  
Sensor Signal with Ground Rod  
Digital Gateway  
2
3
Metal Braid  
Jumper 2 from J3-1 to J3-3  
Ref  
Temp +  
J3-1  
J3-2  
J3-3  
J3-4  
J1-5  
J1-6  
White  
Red  
Temp +  
Temp –  
Temp –  
Blue  
Ref  
Solution Ground  
Active/Measuring  
not used  
Clear  
Active/Measuring  
not used  
not used  
1
Some applications require the use of an external ground rod with the combination electrode. Use this wiring scheme for  
these applications.  
If Metal Braid is “tinned”, cut the tinned area off and twist the wire to insert into connector.  
Customer-supplied (required)  
2
3
3.2 Connecting/Wiring the Digital Gateway to the sc100 Controller  
DANGER  
The sc100 and certain versions of the sensor are suitable for use in Class 1,  
Division 2, Groups A, B, C, D Hazardous Locations . See Control Drawing 58600-78  
in the sc100 Controller Manual, Cat. No. 58600-18 for acceptable sensor versions  
and installation requirements.  
DANGER  
Le sc100 et certaines versions du capteur peuvent être utilisés dans des endroits  
dangereux de la Classe 1, Division 2, Groupes A, B, C, D. Reportez-vous au schéma  
de contrôle 58600-78 du Manuel du contrôleur sc100, Réf. 58600-18 pour connaître  
les versions des capteurs admises et les conditions d'installation.  
The digital gateway should be wired to the sensor before connecting to the controller.  
3.2.1 Connecting the Digital Gateway Sensor in a Non-hazardous Location  
3.2.1.1 Attaching the Digital Gateway with a Quick-connect Fitting in a Non-hazardous Location  
Important Note: The standard quick-connect fitting is NOT suitable for Class 1, Division 2  
Hazardous Location installations without the connector lock installed, see section 3.2.1 on  
page 13 for more information.  
The digital gateway is supplied with a keyed quick-connect fitting for easy attachment  
to the controller, see Figure 7. Retain the connector cap to seal the connector opening in  
case the sensor must be removed. Optional extension cables may be purchased to extend  
the sensor cable length. If the total cable length exceeds 100 m (328 ft), a termination box  
13  
           
Installation  
Figure 7  
Attaching the Digital Gateway using the Quick-connect Fittings  
3.2.1.2 Hard-wiring the Digital Gateway to the sc100  
Important Note: Hard-wiring the digital gateway to the sc100 is not an approved method  
for Class 1, Division 2 Hazardous Locations.  
1. Disconnect power to the controller if powered.  
2. Open the controller cover.  
3. Disconnect and remove the existing wires between the quick-connect and terminal  
strip J5, see Figure 8 on page 15.  
4. Remove the quick-connect fitting and wires and install the threaded plug on the  
opening to maintain the environmental rating.  
5. Cut the connector from the sensor cable.  
6. Strip the insulation on the cable back 1-inch. Strip ¼-inch of each individual wire end.  
Note: Use of strain relief fitting other than Cat. No. 16664 may result in a hazard. Use only the  
recommended strain relief fitting.  
7. Pass the cable through conduit and a conduit hub or a strain relief fitting (Cat. No.  
16664) and an available access hole in the controller enclosure. Tighten the fitting.  
8. Reinstall the plug on the sensor access opening to maintain the environmental rating.  
9. Wire as shown in Table 4 and Figure 8.  
10. Close and secure the cover.  
14  
   
Installation  
Table 4 Wiring the Sensor at Terminal Block J5  
Terminal Designation  
Terminal Number  
Wire Color  
1
2
3
4
5
6
Data (+)  
Data (–)  
Blue  
White  
Service Request  
+12 V dc  
No Connection  
Brown  
Circuit Common  
Black  
Shield  
Shield (grey wire in existing quick disconnect fitting)  
Figure 8  
Hard-wiring the Digital Gateway  
J1  
J3  
S1  
J2  
U5  
J4  
J5  
U9  
PCB  
CONNECTOR  
NETWORK  
INTERFACE  
CARD  
DANG- EXPLOSION HAZARD  
DO NOT ONNECT WHILE CIRCUIT IS LIVE  
UNLESS AREKNOWN TO BE NON-HAZARDOUS.  
FIELD WIRING  
ISULATION MUST  
BRATED TO  
DANGER RISQUE D'EXPLOSION  
NE PAS DEBNCHER TANT QUE LE EST SOUS  
TENSION, ONIS QU'IL NE S'AGISSE D'UN  
EMPLMENT NON-DANGEROUX  
J6  
80° MINIMUM  
Disconnect  
Power  
From Probe  
3.2.2 Connecting the Digital Gateway to a sc100 Controller in a Hazardous Location  
DANGER  
The sc100 and certain versions of the sensor are suitable for use in Class 1,  
Division 2, Groups A, B, C, D Hazardous Locations . See Control Drawing 58600-78  
in the sc100 Controller Manual, Cat. No. 58600-18 for acceptable sensor versions  
and installation requirements.  
DANGER  
Le sc100 et certaines versions du capteur peuvent être utilisés dans des endroits  
dangereux de la Classe 1, Division 2, Groupes A, B, C, D. Reportez-vous au schéma  
de contrôle 58600-78 du Manuel du contrôleur sc100, Réf. 58600-18 pour connaître  
les versions des capteurs admises et les conditions d'installation.  
DANGER  
Explosion hazard. Do not connect or disconnect equipment unless power has been  
switched off or the area is known to be non-hazardous.  
DANGER  
Risque d’explosion. Couper le courant ou s’assurer que l’emplacement est designe  
non dangereux avant de replacer le aucon composant.  
15  
     
Installation  
3.2.2.1 Attaching the Digital Gateway with a Quick-Connect Fitting in a Hazardous Location  
The digital gateway is supplied with a keyed quick-connect fitting for easy attachment to  
the controller, see Figure 7 on page 14. For Hazardous Locations, a connector safety lock  
(Cat. No. 6139900) must be installed. Retain the connector cap to seal the connector  
opening in case the sensor must be removed.  
1. Remove the connector cap from the sc100 controller. Retain the connector cap to seal  
the connector opening in case the sensor must be removed.  
2. Connect the digital gateway connector to the sensor plug on the sc100.  
3. Install the connector safety lock (Figure 9). Align the lock over the connector and  
squeeze the two halves together to lock. To remove the connector safety lock, insert a  
small flat-blade screwdriver into the locking groove. Pivot the screwdriver away from  
the groove and separate the two halves (Figure 9).  
Figure 9  
Installing the Connector Safety Lock  
38.1 mm  
(1.50 inches)  
38.1 mm  
(1.50 inches)  
3.3 Connecting the Sensor to the sc1000  
3.3.1 Connecting the Sensor using the Quick-connect Fittings  
1. Unscrew the connector cap from the controller. Retain the connector cap to seal the  
connector opening in case the sensor must be removed.  
2. Push the digital gateway connector into the socket.  
3. Hand-tighten the union nut.  
Note: Do not use the middle connection for the sensors as this is reserved for the display module.  
16  
       
Installation  
3.4 Mounting the Digital Gateway  
The digital gateway is supplied with a mounting clip for mounting to a wall or other flat  
surface. See Figure 10 for dimensions. Use an appropriate fastener to secure it to the wall,  
see Figure 11. After the sensor is wired to the digital gateway and the two halves are  
threaded together, place the mounting clip over the center of the digital gateway and  
squeeze the clip together to secure.  
Figure 10  
Digital Gateway Dimensions  
184.15 mm (7.25 inches)  
34.29 mm  
(1.35 inches)  
Figure 11  
Mounting the Digital Gateway  
1. Mounting Clip  
3. Hex Nut, ¼-28  
2. Screw, pan head, ¼-28 x 1.25-in.  
4. Mount clip, insert digital gateway, squeeze clip closed.  
17  
     
Section 4 User Interface and Navigation  
4.1 Using the sc100 Controller  
The front of the controller is shown in Figure 12. The keypad consists of the eight keys  
described in Table 5.  
Figure 12  
Front of the Controller  
1
5
sc100  
6
7
2
3
4
1. Instrument display  
2. BACK key  
5. IrDA window  
6. HOME key  
7. ENTER key  
3. MENU key  
4. RIGHT, LEFT, UP, and DOWN keys  
Table 5 Controller Key Functions/Features  
Number  
2
Key  
Function  
Moves back one level in the menu structure.  
Moves to the main menu from other menus. This key is not active in menus where a selection or  
other input must be made.  
3
4
Navigates through the menus, changes settings, and increments and decrements digits.  
Moves to the Main Measurement screen from any other screen. This key is not active in menus  
where a selection or other input must be made.  
5
6
Accepts an input value, updates, or accepts displayed menu options.  
19  
         
User Interface and Navigation  
4.1.1 Controller Display Features  
When a sensor is connected and the controller is in measurement mode, the controller  
automatically identifies the connected sensors and displays associated measurements.  
The display will flash on startup, when a sensor error has occurred, and when a sensor is  
being calibrated.  
An active system warning will cause the warning icon (a triangle with an exclamation point  
inside) to be displayed on the right side of the display. See Figure 13.  
Figure 13  
Display  
1
SENSOR NAME:  
4
5
2
3
7.00  
pH  
6
TEMP: 23.0°C  
1. Status bar. Indicates the sensor name and status of relays. The relay 4. Parameter  
letter is displayed when the relay is energized.  
2. Main measurement  
5. Warning icon area  
6. Measurement units  
3. Secondary measurement (if applicable)  
4.1.2 Important Key Presses  
Press HOME then the RIGHT or LEFT key to display two readings when two sensors  
are connected. Continue to press the RIGHT or LEFT key to toggle through the  
available display options as shown below.  
Press the UP and DOWN keys to toggle the status bar at the bottom of the  
measurement display to display the secondary measurement (temperature) and  
output information.  
SENSOR NAME:  
SENSOR NAME:  
SENSOR NAME:  
pH  
pH  
pH  
7.00  
7.00  
7.00  
TEMP: 23.0°C  
OUTPUT1: 12.00 mA  
OUTPUT2: 12.00 mV  
When in Menu mode, an arrow may appear on the right side of the display to indicate  
that more menus are available. Press the UP or DOWN key (corresponding to the  
arrow direction) to display additional menus.  
MAIN MENU  
SYSTEM SETUP  
SYSTEM SETUP  
SYSTEM SETUP  
SENSOR DIAG  
SENSOR SETUP  
SYSTEM SETUP  
TEST/MAINT  
OUTPUT SETUP  
RELAY SETUP  
NETWORK SETUP  
DISPLAY SETUP  
DISPLAY SETUP  
SECURITY SETUP  
LOG SETUP  
SECURITY SETUP  
LOG SETUP  
CALCULATION  
CALCULATION  
ERROR HOLD MODE  
20  
       
User Interface and Navigation  
4.2 Using the sc1000 Controller  
The sc1000 is a touch screen application. Use your finger to touch keys and menu  
commands. In normal operation the touch screen displays the measured values for the  
sensors selected.  
4.2.1 Display Features  
4.2.1.1 Using the Pop-up Toolbar  
The pop-up toolbar provides access to the controller and sensor settings. The toolbar is  
normally hidden from view. To view the toolbar, touch the bottom-left of the screen.  
Figure 14  
Pop-up Toolbar Functions  
1
2
4
MAIN MENU–displays the Main Menu Structure  
UP Arrow–scrolls up to the previous displayed value.  
Displays one value.  
1
2
4
Displays two values at the same time.  
Displays four values at the same time.  
LIST–displays the list of connected devices and sensors.  
DOWN Arrow–scrolls down to the next displayed value.  
4.2.1.2 Using the Menu Windows  
If the Menu button (from the pop-up toolbar) is selected, the Main Menu screen is opened.  
The Main Menu screen allows the user to view the sensor status, configure the sensor  
setup, system setup, and perform diagnostics.  
The menu structure may vary depending on the configuration of the system.  
21  
               
User Interface and Navigation  
Figure 15  
Main Menu  
2
3
4
5
6
7
1
1. Display Area  
2. BACK  
3. FORWARD  
4. ENTER–confirms the entry or selection.  
5. HOME–changes to the display of measured values. The pop-up toolbar cannot open from the menu window. To view the  
Main Menu from this display, touch the Home button and then the bottom of the screen.  
6. UP–scrolls up  
7. DOWN–scrolls down  
4.2.1.3 Navigating the Menu Windows  
To view a menu item, touch the menu item or use the UP and DOWN keys to highlight the  
item. The menu item remains highlighted for approximately 4 seconds after it is selected.  
To view the highlighted command, select the area to the left of the menu item or select the  
ENTER button.  
A “+” next to a menu command indicates there is a submenu. Touch the “+” to view the  
submenu. An “i” next to a menu command indicates it is information only.  
If a menu item is editable, highlight the item and touch the far-left part of the menu item  
until it is highlighted and press ENTER or double-tap the highlighted item. A keypad will be  
displayed to change an entry (Figure 17 on page 23) or a list box will be displayed  
Messages are displayed in the message window (Figure 19 on page 24).  
If an entry is incorrect, repeat the entry with the correct values. If the entry is outside the  
working range, a correction to the entry is made automatically.  
22  
     
User Interface and Navigation  
Figure 16  
Changing a Menu Item  
1. Display Area  
2. BACK  
5. HOME–changes to the display of measured values.  
6. UP–scrolls up  
3. FORWARD  
7. DOWN–scrolls down  
4. ENTER–confirms the entry or selection.  
Figure 17  
Keypad  
1
2
3
4
5
6
1
4
7
2
5
8
3
6
9
:
/
0
1. Enters numbers or the character as shown on the button.  
2. Moves the cursor one position to the left or to the right.  
3. Increase/Decrease a number or letter at the cursor position. Keep the button pressed to change the numbers/characters  
continuously.  
4. Deletes the character to the left of the cursor.  
5. CANCEL–cancels the entry.  
6. ENTER–confirms the entry or selection.  
23  
   
User Interface and Navigation  
Figure 18  
List Box  
1
2
3
1. Scrolls up or down  
2. CANCEL–cancels and entry.  
3. ENTER–confirms a selection.  
Figure 19  
Message window  
1
2
3
4
5
6
COMMUNICATION ERROR  
Ph [11f20030007]  
1. Scrolls up or down.  
2. Displays the messages or warnings.  
3. Displays details on the selected entry.  
4. This button changes back to the previous display.  
5. ENTER–confirms an entry.  
6. CANCEL–cancels an entry.  
24  
   
Section 5 Operation  
5.1 Sensor Setup  
When a sensor is initially installed, the serial number of the Digital Gateway will be  
displayed as the sensor name. To change the sensor name refer to the following  
instructions:  
1. Select Main Menu.  
2. From the Main Menu, select SENSOR SETUP and confirm.  
3. Highlight the appropriate sensor if more than one sensor is attached and confirm.  
4. Select CONFIGURE and confirm.  
5. Select EDIT NAME and edit the name. Confirm or cancel to return to the Sensor  
Setup menu.  
5.2 Sensor Data Logging  
The sc1000 controller provides a data log for each sensor.  
The sc100 provides three data logs (one for each sensor and one for calculated values).  
The data logs store the measurement data at selected intervals. The event log stores a  
variety of events that occur on the devices such as configuration changes, alarms, and  
warning conditions. The data logs are stored in a packed binary format and the event logs  
are stored in a CSV format. The logs can be downloaded through the digital network port,  
service port, or the IrDA port. DataCom is needed for downloading logs to a computer.  
5.3 Sensor Diagnostics Menu for pH and ORP  
SELECT SENSOR (if more than one sensor is attached)  
STATUS  
ERROR LIST  
WARNING LIST  
5.4 pH Sensor Setup Menu  
SELECT SENSOR (if more than one sensor is attached)  
CALIBRATE (Main Menu Item)  
1 POINT AUTO  
2 POINT AUTO  
1 POINT MANUAL  
2 POINT MANUAL  
TEMP ADJUST  
DEFAULT SETUP  
Calibration with a single buffer — normally pH 7.  
Calibration with two buffers — normally pH 7 and pH 4 or 10.  
Calibration against a single known sample.  
Calibration against two samples, both with a known pH.  
Adjust the displayed temperature by up to ± 15 °C.  
Restores the system to the original factory calibration.  
CONFIGURE  
EDIT NAME  
Enter up to a 10-digit name in any combination of symbols and alpha or numeric characters.  
Select the appropriate measurement units to display.  
SELECT MEASURE  
DISPLAY FORMAT  
TEMP UNITS  
Select the measurement resolution (xx.xx pH or xx.x pH).  
Choose from the displayed options (°C or °F).  
Choose SENSOR INTERVAL to set the sensor log interval or select TEMP INTERVAL to set the  
temperature log interval.  
LOG SETUP  
25  
     
Operation  
5.4 pH Sensor Setup Menu (continued)  
CONFIGURE (continued)  
Choose 50 or 60 Hz depending on the power line frequency for optimal noise rejection. Default is  
60 Hz.  
REJECT FREQ  
FILTER  
Select 0–60 second signal averaging time.  
TEMP ELEMENT  
SELECT BUFFER  
Select type of temperature element from the displayed choices.  
Select the buffer type (standard 4, 7, 10 or DIN 19267) from the displayed choices.  
Allows the user to specify that ammonia, morpholine, or other user-defined electrolyte is being  
used in the application, allowing a temperature-dependent linear slope factor to be applied to the  
measured pH.  
PURE H20 COMP  
CAL DAYS  
Number of days since the last calibration. Default notification at 60 days.  
Number of days the sensor has been in operation. Default notification at 365 days.  
Resets all user-editable options to their factory-defaults.  
SENSOR DAYS  
DEFAULT SETUP  
DIAG/TEST  
Display the sensor type, entered name of the sensor (Default: Digital Gateway serial number and  
name), the sensor serial number, the software version number, and the sensor driver version  
number.  
PROBE INFO  
CAL DATA  
Displays the pH slope and the date of the last calibration.  
SENSOR SIGNAL: Displays the sensor output in mV  
SENSOR ADC COUNTS: Displays the sensor ADC counts  
TEMP ADC COUNTS: Displays raw data for temperature ADC counts. ADC counts are  
comparable to A/D counts and are for sensor electronic diagnostic purposes only.  
SIGNALS  
ELECTRODE STATE: Identifies the state of the electrode (good or bad) depending on whether  
the impedance is within preset limits.  
ACTIVE ELECT: Displays the impedance (Mohms) of the active electrode if Imped Status is set  
to Enabled.  
IMPED STATUS: Sensor diagnostic. Choose Enabled or Disabled.  
SENSOR DAYS: Displays the cumulative days the sensor has been in use.  
RESET SENSOR: Allows the sensor counter to be reset to zero.  
ELECTRODE DAYS: Cumulative days the electrode has been in use.  
COUNTERS  
26  
Operation  
5.5 ORP Sensor Setup Menu  
SELECT SENSOR (if more than one sensor is attached)  
CALIBRATE (Main Menu Item)  
1 POINT MANUAL  
TEMP ADJUST  
Calibration against a single known sample.  
Adjust the displayed temperature by up to ± 15 °C.  
Restores the system to the original factory calibration.  
DEFAULT SETUP  
CONFIGURE  
EDIT NAME  
Enter up to a 10-digit name in any combination of symbols and alpha or numeric characters.  
Choose from the displayed sensor type (pH or ORP).  
SELECT SENSOR  
TEMP UNITS  
Choose from the displayed options (°C or °F).  
Choose SENSOR INTERVAL to set the sensor log interval or select TEMP INTERVAL to set the  
temperature log interval.  
LOG SETUP  
Choose 50 or 60 Hz depending on the power line frequency for optimal noise rejection. Default is  
60 Hz.  
AC FREQUENCY  
FILTER  
Select 0–60 second signal averaging time.  
TEMP ELEMENT  
CAL DAYS  
Select type of temperature element from the displayed choices.  
Number of days since the last calibration. Default notification at 60 days.  
Number of days the sensor has been in operation. Default notification at 365 days.  
Set min/max electrode sensor impedance limits.  
SENSOR DAYS  
IMPED LIMITS  
DEFAULT SETUP  
DIAG/TEST  
Resets all user-editable options to their factory-defaults.  
Display the sensor type, entered name of the sensor (Default: Digital Gateway serial number and  
name), the sensor serial number, the software version number, and the sensor driver version  
number.  
PROBE INFO  
CAL DATA  
Displays the slope and the date of the last calibration.  
SENSOR SIGNAL: displays the sensor output in mV  
SENSOR ADC COUNTS: displays the sensor ADC counts  
TEMP ADC COUNTS: shows raw data for temperature ADC counts. ADC counts are comparable  
to A/D counts and are for sensor electronic diagnostic purposes only.  
SIGNALS  
ELECTRODE STATE: Identifies the state of the electrode (good or bad) depending on whether  
the impedance is within preset limits.  
ACTIVE ELECT: Shows the impedance (Mohms) of the active electrode if Imped Status is set to  
Enabled.  
IMPED STATUS: Sensor diagnostic. Choose Enabled or Disabled.  
SENSOR DAYS: displays the cumulative days the sensor has been in use.  
RESET SENSOR: allows the sensor counter to be reset to zero.  
ELECTRODE DAYS: Cumulative days the electrode has been in use.  
COUNTERS  
27  
Operation  
5.6 pH Calibration  
The manufacturer offers one and two point automatic and manual calibrations for pH. An  
automatic calibration identifies the buffer table corresponding to the chosen buffer and  
automatically calibrates the probe after it stabilizes. A manual calibration is performed by  
placing the pH sensor in any buffer or sample with a known value and then entering that  
known value into the controller.  
The value of the sample used in the manual calibration may be determined by laboratory  
analysis or comparison reading.  
5.6.1 One Point Automatic Calibration  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select 1 POINT AUTO. Select the available Output Mode (Active, Hold, or Transfer)  
from the list box and confirm.  
5. Move the clean probe to buffer and confirm to continue.  
6. Confirm when stable. A screen will display 1 Point Auto Complete and the slope  
(XX.X mV/pH).  
7. Return the probe to process.  
5.6.2 Two Point Automatic Calibration  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select 2 POINT AUTO. Select the available Output Mode (Active, Hold, or Transfer)  
from the list box and confirm.  
5. Move the clean probe to Buffer 1 and confirm.  
6. Confirm when stable.  
7. Move the clean probe to Buffer 2 and confirm.  
8. Confirm when stable. A screen will display 2 Point Calibration Complete and the slope  
(XX.X mV/pH).  
9. Return the probe to process.  
28  
     
Operation  
5.6.3 One Point Manual Calibration  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select 1 POINT MANUAL. Select the available Output Mode (Active, Hold, or Transfer)  
from the list box and confirm.  
5. Move the clean probe to solution and confirm to continue.  
6. Confirm when stable. Edit the solution value using the keypad and confirm.  
7. Confirm when stable. A screen will display 1 Point Manual Complete and the slope  
(XX.X mV/pH).  
8. Return the probe to process.  
5.6.4 Two Point Manual Calibration  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select 2 POINT MANUAL CAL. Select the available Output Mode (Active, Hold, or  
Transfer) from the list box and confirm.  
5. Move the clean probe to Solution 1 and confirm.  
6. Confirm when stable. Edit the solution value using the keypad and confirm.  
7. Move probe to solution 1 and confirm.  
8. Confirm when stable. Edit the solution value using the keypad and confirm.  
9. A screen will display 2 Point Manual Cal Complete and the slope (XX.X mV/pH).  
10. Return the probe to process.  
29  
   
Operation  
5.7 ORP Calibration  
5.7.1 One-point Manual Calibration  
The manufacturer offers a one point manual calibration for ORP. The value of the sample  
used in the manual calibration may be determined by laboratory analysis or comparison  
reading.  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select 1 POINT MANUAL CAL. Select the available Output Mode (Active, Hold, or  
Transfer) from the list box and confirm.  
5. Move the clean probe to Solution and confirm.  
6. Confirm when stable. Edit the solution value using the keypad and confirm.  
7. A screen will display 1 Point Manual Complete and the slope (XX.X mV).  
8. Return the probe to process.  
5.8 Concurrent Calibration of Two Sensors for pH and ORP  
1. Begin a calibration on the first sensor and continue until “Wait to Stabilize”  
is displayed.  
2. Select LEAVE and confirm. The display will return to the main measurement screen.  
The reading for the sensor currently being calibrated will flash.  
3. Begin the calibration for the second sensor and continue until “Wait to Stabilize”  
is displayed.  
4. Select LEAVE and confirm. The display will return to the main measurement screen  
and the reading for both sensors will flash. The calibration for both sensors are now  
running in the background.  
5. To return to the calibration of either sensor select SENSOR SETUP from the Main  
Menu and confirm. Select the appropriate sensor and confirm.  
6. The calibration in progress will be displayed. Continue with the calibration.  
30  
     
Operation  
5.9 Adjusting the Temperature  
View or change the temperature using the steps below:  
1. From the Main Menu, select SENSOR SETUP and confirm.  
2. Select the appropriate sensor if more than one is attached and confirm.  
3. Select CALIBRATE and confirm.  
4. Select TEMP ADJUST and confirm.  
5. Select MEASURED TEMP and confirm.  
6. The temperature will be displayed. Select the temperature to edit and confirm.  
31  
 
Section 6 Maintenance  
DANGER  
Only qualified personnel should conduct the tasks described in this section of the  
manual.  
DANGER  
Seul un technicien qualifié peut effectuer les tâches d'installation décrites dans  
cette section du manuel.  
DANGER  
Explosion hazard. Do not connect or disconnect equipment unless power has been  
switched off or the area is known to be non-hazardous.  
DANGER  
Risque d’explosion. Couper le courant ou s’assurer que l’emplacement est designe  
non dangereux avant de replacer le aucon composant.  
DANGER  
Explosion hazard. Substitution of components may impair suitability for Class 1,  
Division 2.  
DANGER  
Risque d’explosion. La substitution de composants peut rendre ce materiel  
inacceptable pour les emplacements de Classe 1, Division 2.  
6.1 Maintenance Schedule  
Maintenance Task  
90 days  
Annually  
1
Clean the sensor  
x
x
Inspect sensor for damage  
Calibrate Sensor (if required by regulatory agency)  
Per the schedule mandated by your regulatory agency.  
1
Cleaning frequency is application dependent. More or less frequent cleaning will be appropriate in some applications.  
33  
     
Maintenance  
6.2 Cleaning the Sensor  
CAUTION  
Before cleaning with acid, determine if the chemical reaction between the acid and  
the sample will create a hazardous chemical reaction. (For example, do not put a  
sensor that is used in a cyanide bath directly into a strong acid for cleaning  
because this chemical combination may produce poisonous cyanide gas.)  
DANGER  
Acids are hazardous. Always wear appropriate eye protection and clothing in  
accordance with material safety data sheet recommendations.  
1. Clean the exterior of the sensor with a stream of water. If debris remains remove  
loose contaminate buildup by carefully wiping the entire measuring end of the sensor  
with a soft clean cloth. Rinse the sensor with clean, warm water.  
2. Prepare a mild soap solution of warm water and dish detergent or other non-abrasive  
soap that does not contain lanolin.  
Note: Lanolin will coat the glass process electrode and can adversely affect sensor performance.  
3. Soak the sensor for 2 to 3 minutes in the soap solution.  
4. Use a small soft-bristle brush and scrub the entire measuring end of the sensor,  
thoroughly cleaning the electrode and reference junction surfaces. If surface deposits  
cannot be removed by detergent solution cleaning, use muriatic acid (or other dilute  
acid) to dissolve them. The acid should be as dilute as possible, do not use stronger  
than 3% HCL. Experience will determine which acid to use and the appropriate  
dilution ratio. Some stubborn coatings may require a different cleaning agent. For  
5. Soak the entire measuring end of the sensor in dilute acid for no more than 5 minutes.  
Rinse the sensor with clean, warm water then place the sensor back into the mild  
soap solution for 2 to 3 minutes to neutralize any remaining acid.  
6. Remove the sensor from the soap solution, and rinse the sensor again in clean, warm  
water.  
7. After cleaning, always calibrate the measurement system. Refer to section 4.7 on  
page 25 or section 4.8 on page 29.  
34  
   
Section 7 Troubleshooting  
7.1 Error Codes  
When a sensor is experiencing an error condition, the sensor reading on  
the measurement screen will flash and all relays and analog outputs associated with this  
sensor will be held. The following conditions will cause the sensor reading to flash:  
Sensor calibration  
Relay timer washing cycle  
Loss of communication  
Highlight the Sensor Diag menu and press ENTER. Highlight Errors and press ENTER to  
determine the cause of the error. Errors are defined in Table 6.  
Table 6 Error Codes  
Displayed Error  
Definition  
Resolution  
ADC FAILURE  
System measurement fails  
Contact Technical Consulting Services.  
7.2 Warnings  
A sensor warning will leave all menus, relays, and outputs functioning normally, but will  
cause a warning icon to flash on the right side of the display. Highlight the Sensor Diag  
menu and press ENTER to determine the cause of the warning.  
A warning may be used to trigger a relay and users can set warning levels to define the  
severity of the warning. Warnings are defined in Table 7.  
Table 7 Warning Codes  
Displayed Warning  
Definition  
Resolution  
PROBE OUT RANGE Measured pH/ORP exceeds the expected value range.  
Contact Technical Consulting Services.  
Measured temperature exceeds the expected value  
TEMP OUT RANGE  
range.  
Contact Technical Consulting Services.  
Contact Technical Consulting Services.  
Contact Technical Consulting Services.  
FLASH FAILURE  
System flash memory write has failed.  
Standard Electrode is not performing within the required  
specifications.  
REF ELECTRODE  
7.3 Troubleshooting the pH or ORP Sensor  
Clean the sensor using the procedure described in section 6.2 on page 34 and then  
calibrate the sensor as shown in section 4.7 on page 25 or section 4.8 on page 29.  
If the measuring system cannot be calibrated after cleaning, contact Technical and  
35  
                   
Section 8 Replacement Parts and Accessories  
8.1 Replacement Items, Accessories, and Reagent and Standards  
Item Description  
QTY  
Catalog Number  
Instruction manual, Combination pH System, English  
Cable, sensor extension, 1 m (3 ft)  
Cable, sensor extension, 7.7 m (25 ft)  
Cable, sensor extension, 15 m (50 ft)  
Cable, sensor extension, 31 m (100 ft)  
Connector Safety Lock  
each  
each  
6120118  
6122400  
each  
5796000  
each  
5796100  
each  
5796200  
each  
6139900  
Termination box  
each  
586700  
Plug, sealing, conduit opening  
Strain relief, Heyco  
each  
5868700  
each  
16664  
Buffer, pH 7  
500 mL (1 pint)  
500 mL (1 pint)  
500 mL (1 pint)  
1 gallon  
1 gallon  
1 gallon  
500 mL (1 pint)  
500 mL (1 pint)  
1 gallon  
1 gallon  
2283549  
Buffer, pH 4  
2283449  
Buffer, pH 10  
2283649  
Buffer, pH 7  
2283556  
Buffer, pH 4  
2283456  
Buffer, pH 10  
2283656  
ORP Standard Solution, 200 mV  
ORP Standard Solution, 600 mV  
ORP Standard Solution, 200 mV  
ORP Standard Solution, 600 mV  
25M2A1001-115  
25M2A1002-115  
25M2A1001-123  
25M2A1002-123  
37  
       
Section 9 How to Order  
U.S.A. Customers  
By Telephone:  
6:30 a.m. to 5:00 p.m. MST  
Monday through Friday  
(800) 227-HACH (800-227-4224)  
By Fax:  
(970) 669-2932  
By Mail:  
Hach Company  
P.O. Box 389  
Loveland, Colorado 80539-0389 U.S.A.  
Ordering information by e-mail: [email protected]  
Information Required  
Hach account number (if available)  
Billing address  
Shipping address  
Catalog number  
Quantity  
Your name and phone number  
Purchase order number  
Brief description or model number  
International Customers  
Hach maintains a worldwide network of dealers and distributors. To locate the  
representative nearest you, send an e-mail to: [email protected] or contact:  
Hach Company World Headquarters; Loveland, Colorado, U.S.A.  
Telephone: (970) 669-3050; Fax: (970) 669-2932  
Technical and Customer Service (U.S.A. only)  
Hach Technical and Customer Service Department personnel are eager to answer  
questions about our products and their use. Specialists in analytical methods, they are  
happy to put their talents to work for you.  
Call 1-800-227-4224 or e-mail [email protected]  
39  
   
Section 10 Repair Service  
Authorization must be obtained from Hach Company before sending any items for  
repair. Please contact the Hach Service Center serving your location.  
In the United States:  
Hach Company  
Ames Service  
100 Dayton Avenue  
Ames, Iowa 50010  
(800) 227-4224 (U.S.A. only)  
FAX: (515) 232-3835  
In Canada:  
Hach Sales & Service Canada Ltd.  
1313 Border Street, Unit 34  
Winnipeg, Manitoba  
R3H 0X4  
(800) 665-7635 (Canada only)  
Telephone: (204) 632-5598  
FAX: (204) 694-5134  
In Latin America, the Caribbean, the Far East,  
Indian Subcontinent, Africa, Europe, or the Middle East:  
Hach Company World Headquarters,  
P.O. Box 389  
Loveland, Colorado, 80539-0389 U.S.A.  
Telephone: (970) 669-3050  
FAX: (970) 669-2932  
40  
 
Section 11 Limited Warranty  
Hach Company warrants its products to the original purchaser against any defects that are due to faulty  
material or workmanship for a period of one year from date of shipment unless otherwise noted in the  
product manual.  
In the event that a defect is discovered during the warranty period, Hach Company agrees that, at its  
option, it will repair or replace the defective product or refund the purchase price excluding original  
shipping and handling charges. Any product repaired or replaced under this warranty will be warranted  
only for the remainder of the original product warranty period.  
This warranty does not apply to consumable products such as chemical reagents; or consumable  
components of a product, such as, but not limited to, lamps and tubing.  
Contact Hach Company or your distributor to initiate warranty support. Products may not be returned  
without authorization from Hach Company.  
Limitations  
This warranty does not cover:  
Damage caused by acts of God, natural disaster, labor unrest, acts of war (declared or undeclared),  
terrorism, civil strife or acts of any governmental jurisdiction  
Damage caused by misuse, neglect, accident or improper application or installation  
Damage caused by any repair or attempted repair not authorized by Hach Company  
Any product not used in accordance with the instructions furnished by Hach Company  
Freight charges to return merchandise to Hach Company  
Freight charges on expedited or express shipment of warranted parts or product  
Travel fees associated with on-site warranty repair  
This warranty contains the sole express warranty made by Hach Company in connection with its  
products. All implied warranties, including without limitation, the warranties of merchantability and fitness  
for a particular purpose, are expressly disclaimed.  
Some states within the United States do not allow the disclaimer of implied warranties and if this is true  
in your state the above limitation may not apply to you. This warranty gives you specific rights, and you  
may also have other rights that vary from state to state.  
This warranty constitutes the final, complete, and exclusive statement of warranty terms and no person  
is authorized to make any other warranties or representations on behalf of Hach Company.  
Limitation of Remedies  
The remedies of repair, replacement or refund of purchase price as stated above are the exclusive  
remedies for the breach of this warranty. On the basis of strict liability or under any other legal theory, in  
no event shall Hach Company be liable for any incidental or consequential damages of any kind for  
breach of warranty or negligence.  
41  
   
Section 12 Compliance Information  
Hach Company certifies this instrument was tested thoroughly, inspected and found to  
meet its published specifications when it was shipped from the factory.  
The Model sc100 Controller/sc1000 Controller and the pH Combination sensor has  
been tested and is certified as indicated to the following instrumentation standards:  
Product Safety  
Immunity  
UL 61010A-1 (ETL Listing # 65454)  
CSA C22.2 No. 1010.1 (ETLc Certification # 65454)  
Certified by Hach Co. to EN 61010-1 Amds. 1 & 2 (IEC1010-1) per 73/23/EEC,  
supporting test records by Intertek Testing Services.  
This equipment was tested for industrial level EMC per:  
EN 61326 (EMC Requirements for Electrical Equipment for Measurement, Control  
and Laboratory Use) per 89/336/EEC EMC: Supporting test records by Hach  
Company, certified compliance by Hach Company.  
Standards include:  
IEC 1000-4-2:1995 (EN 61000-4-2:1995) Electrostatic Discharge Immunity (Criteria  
B)  
IEC 1000-4-3:1995 (EN 61000-4-3:1996) Radiated RF Electromagnetic Field  
Immunity (Criteria A)  
IEC 1000-4-4:1995 (EN 61000-4-4:1995) Electrical Fast Transients/Burst (Criteria B)  
IEC 1000-4-5:1995 (EN 61000-4-5:1995) Surge (Criteria B)  
IEC 1000-4-6:1996 (EN 61000-4-6:1996) Conducted Disturbances Induced by RF  
Fields (Criteria A)  
IEC 1000-4-11:1994 (EN 61000-4-11:1994) Voltage Dip/Short Interruptions (Criteria  
B)  
Additional Immunity Standard/s include:  
ENV 50204:1996 Radiated Electromagnetic Field from Digital Telephones (Criteria A)  
Emissions  
This equipment was tested for Radio Frequency Emissions as follows:  
Per 89/336/EEC EMC: EN 61326:1998 (Electrical Equipment for measurement,  
control and laboratory use—EMC requirements) Class “A” emission limits. Supporting  
test records by Hewlett Packard, Fort Collins, Colorado Hardware Test Center (A2LA #  
0905-01) and certified compliance by Hach Company.  
Standards include:  
EN 61000-3-2 Harmonic Disturbances Caused by Electrical Equipment  
EN 61000-3-3 Voltage Fluctuation (Flicker) Disturbances Caused by Electrical  
Equipment  
Additional Emissions Standard/s include:  
EN 55011 (CISPR 11), Class “A” emission limits  
43  
   
Compliance Information  
Canadian Interference-causing Equipment Regulation, IECS-003, Class A  
Supporting test records by Hewlett Packard, Fort Collins, Colorado Hardware Test Center  
(A2LA # 0905-01) and certified compliance by Hach Company.  
This Class A digital apparatus meets all requirements of the Canadian Interference-  
Causing Equipment Regulations.  
Cet appareil numèrique de la classe A respecte toutes les exigences du Rëglement sur le  
matÈriel brouilleur du Canada.  
FCC PART 15, Class “A” Limits  
Supporting test records by Hewlett Packard, Fort Collins, Colorado Hardware Test Center  
(A2LA # 0905-01) and certified compliance by Hach Company.  
This device complies with Part 15 of the FCC Rules. Operation is subject to the following  
two conditions:  
(1) this device may not cause harmful interference, and (2) this device must accept any  
interference received, including interference that may cause undesired operation.  
Changes or modifications to this unit not expressly approved by the party responsible for  
compliance could void the user's authority to operate the equipment.  
This equipment has been tested and found to comply with the limits for a Class A digital  
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide  
reasonable protection against harmful interference when the equipment is operated in a  
commercial environment. This equipment generates, uses, and can radiate radio  
frequency energy and, if not installed and used in accordance with the instruction manual,  
may cause harmful interference to radio communications. Operation of this equipment in a  
residential area is likely to cause harmful interference, in which case the user will be  
required to correct the interference at his own expense. The following techniques of  
reducing the interference problems are applied easily.  
1. Disconnect the Controller from its power source to verify that it is or is not the source  
of the interference.  
2. If the Controller is connected into the same outlet as the device with which it is  
interfering, try another outlet.  
3. Move the Controller away from the device receiving the interference.  
4. Reposition the receiving antenna for the device receiving the interference.  
5. Try combinations of the above.  
44  
Appendix A Modbus Register Information  
Table 8 Sensor Modbus Registers  
Register  
#
Data  
Type  
Group Name  
Tag Name  
Length  
R/W  
Description  
Tags  
SensorMeasTag  
40001  
40002  
40004  
40005  
40007  
40013  
40014  
40015  
40016  
40017  
40018  
40020  
40021  
40022  
40023  
40025  
40026  
40027  
40029  
40030  
40031  
40032  
40033  
40035  
40037  
40043  
40049  
40051  
40053  
40054  
40055  
40056  
40058  
40060  
40062  
40064  
40066  
40067  
40068  
40069  
40070  
40071  
Integer  
Float  
1
2
1
2
6
1
1
1
1
1
2
1
1
1
2
1
1
2
1
1
1
1
2
2
6
6
2
2
1
1
1
2
2
2
2
2
1
1
1
1
1
5
R
R
R
R
Sensor measurement tag  
pH /ORP measurement  
Measurements pHMeas  
Tags  
TempMeasTag  
Integer  
Float  
Temperature measurement tag  
Temperature measurement  
Measurements TempDegCMeas  
Configuration  
Tags  
SensorName  
FuncCode  
String  
Integer  
Integer  
Integer  
Integer  
Integer  
Long  
R/W Sensor name  
R/W Function code tag  
R/W Next state tag  
Tags  
NextState  
Configuration  
Configuration  
Configuration  
Configuration  
Configuration  
Configuration  
Tags  
MeasType  
R/W Measurement type—pH or ORP  
R/W Temperature units—C or F  
R/W pH display format  
TempUnits  
pHFormat  
TaggedPhFormat  
Filter  
R
pH display tagged format  
Integer  
Integer  
Integer  
Float  
R/W Sensor filter  
TempElementType  
TempUserValueTag  
TempUserDegCValue  
pHBuffer  
R/W Temperature element type  
R
Temperature user value tag  
Configuration  
Configuration  
Configuration  
Configuration  
Calibration  
Calibration  
Calibration  
Tags  
R/W Temperature user value  
R/W pH buffer type  
Integer  
Integer  
Float  
PureWaterCompType  
PureWaterCompUser  
OutputMode  
CalLeave  
R/W Pure H O compensation type  
2
R/W Pure H O compensation user val  
2
Integer  
Integer  
Integer  
Integer  
Float  
R/W Output mode  
R/W Cal leave mode  
R/W Cal abort mode  
CalAbort  
CalEditValueTag  
CalEditPhValue  
pHSlope  
R
Cal edit value tag  
Calibration  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Calibration  
Configuration  
Configuration  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Diagnostics  
Configuration  
Diagnostics  
R/W Cal edit value  
Float  
R
R
R
R
R
R
pH slope  
SoftwareVersion  
SerialNumber  
pHOffset  
String  
String  
Float  
Software version  
Serial number  
pH offset  
OrpOffset  
Float  
Orp offset  
CalCode  
Integer  
Integer  
Integer  
Float  
Cal code  
SensorLogInterval  
TempLogInterval  
pHmV  
R/W Sensor data log interval  
R/W Temperature data log interval  
R
pH mV  
ProdDate  
Date  
R/W Production date  
StdElectrode  
RefElectrode  
LastCalDate  
SensorDays  
ElectrodeDays  
ElectrodeStatus  
SensorType  
Float  
R
R
R
R
R
R
R
Standard electrode impedance  
Float  
Reference electrode impedance  
Last calibration date  
Sensor running days  
Electrode running days  
Electrode status  
Date  
Integer  
Integer  
Integer  
Integer  
Integer  
String  
Sensor type  
RejectFrequency  
DeviceDriver  
R/W Reject frequency  
Device driver  
R
45  
Modbus Register Information  
Table 8 Sensor Modbus Registers  
Register  
#
Data  
Type  
Group Name  
Tag Name  
Length  
R/W  
Description  
Configuration  
Configuration  
CalWarningDays  
40076  
40077  
Integer  
Integer  
1
1
R/W Calibration warning days  
R/W Sensor warning days  
SensorWarningDays  
46  
Appendix B General pH Information  
B.1 pH Measurement Theory  
pH is the negative logarithm of the hydrogen ion activity and a measure of the acidity or  
alkalinity of a solution.  
pH = –log A[H+]  
pH is normally measured using a glass electrode and a reference electrode.  
The glass electrode acts as a transducer, converting chemical energy (the hydrogen ion  
activity) into an electrical energy (measured in millivolts). The reaction is balanced and the  
electrical circuit is completed by the flow of ions from the reference solution to the solution  
under test.  
The electrode and reference solution together develop a voltage (emf) whose magnitude  
depends on the type of reference electrode, the internal construction of the glass  
electrode, the pH of the solution and the temperature of the solution. This voltage is  
expressed by the Nernst Equation:  
E = E – (2.3 RT/F) x log A[H+]  
o
E = E – (slope) x log A[H+]  
o
where:  
E = the emf of the cell  
E = the zero potential (isopotential) of the system. It depends on the internal  
o
construction of the glass and reference electrodes.  
R = gas constant  
T = temperature in Kelvin  
A[H+] = activity of the hydrogen ion (assumed to be equivalent to the concentration of  
hydrogen ions)  
F = Faraday constant  
For every unit change in pH (or decade change in ion concentration) the emf of the  
electrode pair changes by 59.16 mV at 25 °C. This value is known as the Nernstian Slope  
of the electrode.  
The pH electrode pair is calibrated using solutions of known and constant hydrogen ion  
concentration, called buffer solutions. The buffer solutions are used to calibrate both the  
electrode isopotential and slope.  
47  
 
General pH Information  
B.2 PID Controller Basics  
A pH control loop operates as follows: The pH meter measures the value of the pH in the  
effluent, and, if the pH is different from the setpoint, the controller actuates the reagent  
pump (or valve) that adds reagent to a mixing tank. The added reagent adjusts the pH  
value of the process.  
The physical layout of the loop, the sizing of the pump (valve), type of mixing tank, and  
location of the pH electrodes all have a major impact on the ultimate performance of the  
loop, after the controller is tuned for optimal performance. The largest single performance  
factor is the delay time around the loop. This includes the response time of the  
electrode/meter, time required to deliver the reagent to the process water, time required  
for the reagent to mix with and react with the process water, and the time required to  
deliver the completely mixed water to the electrode. If the delay times are too long or the  
mixing is not complete, the control will be poor regardless of how well the controller is  
tuned.  
The Process pH Meter uses a PID (proportional, integral (reset), derivative (rate) control)  
control algorithm. Each of the instrument settings along with their effects on the control  
loop, are described below.  
Mode  
Manual: The manual output is specified in percent of full-scale PID output  
(4–20 mA) and is commonly used for testing the output device.  
Auto: Allows the process to be controlled automatically using information specified in the  
Phase, Setpoint, Proportional Band, Integral, and Derivative menus as follows:  
Phase  
Direct: The control output action will cause the process value to increase.  
Reverse: The control output action will cause the process value to decrease.  
Setpoint  
The setpoint is defined as the desired process value in pH  
Proportional Band  
The proportional band is the range in pH from the setpoint value where the controller  
provides proportional control. For example, the desired setpoint for the process is pH 7.0  
and the process requires that a reagent must be added to the process water to bring it up  
to pH 7.0. If the proportional band is set to pH 1.0, the controller will provide proportional  
output control over the range of pH 6.0 to 8.0. When the process is at pH 6.0, the  
controller will provide a 100% control output level (assuming that Phase is set to Direct).  
When the process is at pH 7.0, the proportional control will provide a 0% control output  
level. When the process is at pH 6.5 the proportional control will provide a 50% output.  
The output action is equal to the difference between the setpoint and the process value,  
divided by the proportional band value.  
48  
           
General pH Information  
Integral  
The integral value is used to reduce the steady state error, between the process value and  
the setpoint, to zero. For example, assume a process can be manually controlled at a level  
of pH 8.0 by sending a 35% control output level to a reagent pump. Now, say that the  
system is set up for the controller to provide proportional only control, with the controller  
setpoint set to pH 8.0 and the proportional band set to pH 1.0. Note that the nearer the  
process gets to the pH 8.0 setpoint, the lower the control output level is. In fact, when the  
process is at pH 8.0, the output level will be 0%. Since the process requires that the pump  
be operated at 35% for the process to reach pH 8.0, its apparent that proportional-only  
control will never quite reach the desired setpoint of pH 8.0. This is where the integral  
control comes in.  
Integral control can be thought of as adding up the output action from the proportional  
control over time. For example, the proportional control output reaches a steady state level  
of 5%. If the integral time is set to five minutes, the integral action of the controller will add  
an additional 5% to the controller output level over a 5-minute interval. The integral action  
is additive, so for every 5-minute interval an additional 5% is added to the controller's  
output level. This will allow the controller to bring the process to the desired setpoint level.  
Note that the longer the integral time setting, the longer it takes for the integral action to  
affect the process. The integral control action is disabled by setting it to zero. Note that the  
integral time is in minutes.  
Derivative  
Derivative control is used to adjust the control output level based upon the rate at which  
the process value is approaching or passing the setpoint. Derivative control action would  
be used in cases where the process value can rapidly ramp up and overshoot the setpoint.  
The derivative setting is in minutes. The output action of the derivative control is equal to  
the rate of change of the process (in pH units per minute) times the derivative time, divided  
by the proportional band, times negative one. For example, if the process pH is changing  
at a rate of pH 0.20 per minute, the derivative time is set to 3.0 minutes, the proportional  
band is set to pH 0.80, and the action is “direct” the derivative control output action will be  
approximately equal to: (–0.20 pH/minute X 3.0 minute) /0.80 pH = –75%.  
During calibration, the analog outputs can remain active, be held, or be transferred to a  
preset mA value.  
49  
Index  
B
M
Buttons  
Menu command  
C
Cleaning  
N
P
Parts  
D
PID control  
E
Entries  
S
Sensor Cable  
I
K
T
Key  
W
L
51  

Black Decker BL10450HR User Manual
Boss Audio Systems CHAOS CH1000 User Manual
Canon Camcorder L6 User Manual
Canon Speedlite 270EX II User Manual
Canon Xsi User Manual
Clarion XA311 User Manual
Deni Blend n Grind 4200 User Manual
Hifionics HS500 4 User Manual
Hypertec 6501HY User Manual
JVC GET0592 002A User Manual