FMA 3200/3200ST/3400/3400ST Series
Thermal Mass Flow Controllers
Download from Www.Somanuals.com. All Manuals Search And Download.
READ THIS MANUAL COMPLETELY BEFORE ATTEMPTING TO CONNECT OR
OPERATE YOUR FLOW SENSOR. FAILURE TO DO SO MAY RESULT IN INJURY
TO YOU OR DAMAGE TO THE FLOW CONTROLLER.
T A B L E
O F C O N T E N T S
A. Introduction .............................................................................................4
1. Unpacking...........................................................................................4
2. Product Overview And Principle Of Operation..........................................4
B. Installation...............................................................................................5
1. General Considerations.........................................................................5
2. Mounting The flow controller ...............................................................7
3. Tubing Connections..............................................................................7
5. Electrical Connections ...........................................................................8
a) Overview
....................................................................................8
b) Connecting The 6 Pin Mini Din Connector............................................9
c) Connecting The 6 Pin Mini Din Connector & FMA 3000C Cable ...........10
d) Connections For The 9 Pin D Sub Connector ......................................11
e) Connections For The 15 Pin D Sub Connector.....................................12
f) Using a 0-5VDC Output / Input Power Adapter Package.......................13
C. Operation .............................................................................................14
1. Warm-Up ..........................................................................................14
2. Verification Of Zero ............................................................................14
3. Flow Readings....................................................................................14
4. Changing The Flow Rate Set-Point (Using An External Voltage Source) .......15
5. Changing The Flow Rate Set-Point – FMA3400 / 3400ST Only.................16
6. Power Save Mode...............................................................................16
7. Zero Adjustments................................................................................17
8. Recalibration......................................................................................17
9. Changing The Calibration Gas – FMA3400 / 3400ST Only.....................17
D. Maintenance And Product Care................................................................18
1. General.............................................................................................18
2. Returning Units For Repair Or Recalibration............................................18
E. Specifications.........................................................................................19
F. Dimensions............................................................................................20
G. Gas K Factors........................................................................................22
H. Trouble Shooting Guide ..........................................................................23
M-4271/0707, pg. 3 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
A.
Introduction
1. Unpacking
All units are suitably packaged to prevent damage during shipping. If
external damage is noted upon receipt of the package, please contact
Omega Engineering immediately.
Open the package from the top, taking care not to cut too deeply into the
package. Remove all the documentation and contents. Take care to
remove all the items and check them against the packing slip. The
products should also be checked for any concealed shipping damage. If
any shortages or damage is noted, please contact Omega Engineering to
resolve the problem.
Typical Contents of Box: Controller, Calibration Certificate & Manual
FMA 3200/3200ST shown; FMA 3400/3400ST have an integrated display.
Caution: Take care not to drop your controller. Read the
installation section of this manual before providing power or
tubing connections to the unit. Any damage caused by improper
installation or careless handling will not be repaired under
warranty (see limited warranty on page 25 for more details).
2. Product Overview and Principle of Operation
The FMA 3200/3400 Series Mass Flow Controllers from Omega
Engineering are capable of measuring and controlling the flow of virtually
any clean, dry gas as low as 0-20 sccm or as high as 0-10 l/min.
Repeatable results are achieved using a patented thermal mass flow
M-4271/0707, pg. 4 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
sensor design. This proven design minimizes zero drift while maintaining
fast response and linear outputs with virtually no maintenance.
The FMA 3200/3400 Series
utilizes thermal flow sensing
technology. A portion of the
gas flowing through the unit is
redirected into a small sensor
tube. This tube has two coils
on the outside. The first coil
introduces a small amount of
heat into the gas stream. As
the gas passes through the
tube heat is transferred from
one coil to the other. The flow
rate is proportional to the
amount of heat transfer. Smart
electronics analyze the amount
of temperature change in the
second coil and provide a
linearized analog output. A patented system insures that the zero remains
stable and the sensor is extremely repeatable.
Flow in the FMA 3200/3400 Series is controlled by a proportional solenoid
valve with active servo electronics. The flow measurement signal is
analyzed by micro-processor controlled electronics and compared to a set-
point. Adjustments are then made to the valve in order to achieve the
required flow rate. The set point can be either externally input via a 0-
5VDC signal or in the case of the FMA 3400/3400ST Series it can be input
manually on the unit.
The output of the thermal mass flow sensor is directly related to the
specific heat characteristic of the gas being measured. A sensor is
calibrated for one gas but may be used with other gases by applying a
correction factor to the output. The calibration gas for each specific flow
controller is detailed on the product label.
B.
Installation
Caution: Do not exceed the pressure, temperature or power
operating ranges detailed in the SPECIFICATIONS section of this
manual. Omega Engineering shall not be liable for any damage
or injury caused by incorrect operation of their products.
1. General Considerations
It is recommended that a safety shut-off valve be installed upstream
(before) of the controller.
All wetted parts should be checked for compatibility with the gas to be
used. If there are any incompatibilities eg. highly corrosive gas, then the
M-4271/0707, pg. 5 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
unit may be damaged or fail prematurely. Such damage will not be
repaired under warranty.
Units should be installed in a clean, dry environment with an ambient
temperature that is as stable as possible. Avoid areas with strong magnetic
fields, strong air flows or excessive vibration.
In order to operate the differential pressure across the controller should be
in the range 15-45psid (1-3 bar). For optimum performance a differential
pressure of 25psid is recommended.
For Example, consider the following system:
The differential pressure across the flow controller in this system would be
100 psi – 14 psi = 86 psid. Consequently the flow controller would NOT be
able to control flow. For the unit to operate at optimum performance the
supply pressure from the gas cylinder would need to be lowered to 39 psig
to give 39 psi -14 psi = 25 psid.
M-4271/0707, pg. 6 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
2. Mounting the Flow Controller.
The FMA 3200/3400 Series controllers have no particular orientation or
installation requirements so may be mounted in any convenient position.
It is recommended that units be fixed to a suitable substrate using the two
4-40 mounting holes provided.
Mounting View from Bottom
(mounting hardware not included with sensor)
3. Tubing Connections
All tubing must be clean, dry and purged with clean dry air before
installation of the FLO-CONTROLLER®.
If the gas to be used may contain particles then a filter (20 microns or
less) should be installed upstream of (before) the unit.
When connecting the sensor to the tubing, take care not to over-tighten
the fittings or leaking may occur.
Caution: Only use the fittings factory installed on the unit. If
the fittings are removed the calibration of the unit may be
effected and leaking may occur. If different fittings are required
please contact the Omega Engineering Customer Service
Department for assistance.
M-4271/0707, pg. 7 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
4. Electrical Connections
Caution: Incorrect wiring may cause severe damage to the unit.
Applying an AC voltage (115VAC or 230VAC) directly to the unit
will cause damage. Read the following instructions carefully
before making any connections.
a) Overview
The FMA 3200/3400 Series provides a 0-5VDC analog output proportional
to the flow rate. This output may be connected to a display, data
acquisition system or voltmeter with an impedance of greater than 2.5 kΩ
(kilo ohms).
The flow controller needs to be supplied with a 0-5 VDC set point signal to
enable control. On the FMA 3400/3400ST Series this may be generated
internally by altering the set-point potentiometer on the front panel of the
unit.
A stable D.C. power supply is required to operate the unit. The voltage
and current requirements depend on the configuration of the unit. Full
details may be found in the Specification section of this manual.
Connecting wires should be as short as possible to avoid voltage drops.
Twisted conductor cable should be used if the length of the wiring is to be
longer than 2 meters.
Units are supplied with either a 6 pin mini DIN type connector (requires
mating cable assembly), a 9 Pin D Sub connector or 15 Pin D Sub
connector.
Caution: Cutting off the integrated connectors on the unit IS
NOT RECOMMENDED and will void the product warranty. Mating
cables should be ordered along with each unit.
Electrical connections to the units are made as detailed in the following
sections.
M-4271/0707, pg. 8 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
b) Connecting The 6 Pin Mini Din Connector
Using a suitable mating connector the pins of the integrated connector
should be wired as follows:
Connecting To The Integrated 6 Pin Connector
Pin Out of Integrated
Connector
Pin 2 should be connected to the Positive of the power source.
Pin 6 should be connected to the Negative (Ground) of the power source.
Pin 3 provides the signal output and should be connected to the positive
terminal of the display, data acquisition system or voltmeter.
Pin 1 is the signal negative (ground) and should be connected to the
negative (Ground) terminal of the display, data acquisition system or
voltmeter.
Pin 4 provides the input signal and should be connected to the positive
terminal of the voltage source. The (0-5VDC) voltage control signal should
be supplied from a low impedance source.
Pin 5 is the input signal negative (ground) and should be connected to
the negative (Ground) terminal of the voltage source.
Caution: Avoid high voltage static discharges to the input signal
connection. Do not short the input/output signal wires or allow
them to contact the power wires at any time. DAMAGE WILL
RESULT!
M-4271/0707, pg. 9 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
c) Connecting The 6 Pin Mini Din Connector & FMA 3000C Cable
The two mating connectors should be pushed together and the pigtail
leads wired as follows:
Connecting To The Integrated 6 Pin Connector Using A FMA 3000C Cable
The RED wire should be connected to the Positive of the power source.
The BLACK wire should be connected to the Negative (Ground) of the
power source.
The ORANGE wire provides the signal output and should be connected to
the positive terminal of the display, data acquisition system or voltmeter.
The BROWN wire is the signal negative (ground) and should be
connected to the negative (Ground) terminal of the display, data
acquisition system or voltmeter.
The YELLOW wire provides the input signal and should be connected to
the positive terminal of the voltage source. The (0-5VDC) voltage control
signal should be supplied from a low impedance source.
The GREEN wire is the input signal negative (ground) and should be
connected to the negative (Ground) terminal of the voltage source.
The wire colors above describe the pigtail leads of the FMA 3000C cable
assembly and may not correspond with the internal wiring of your flow
sensor.
Caution: Avoid high voltage static discharges to the input signal
connection. Do not short the input/output signal wires or allow
them to contact the power wires at any time. DAMAGE WILL
RESULT!
M-4271/0707, pg. 10 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
d) Connections For The 9 Pin D Sub Connector
Using a suitable mating connector the pins of the integrated connector
should be wired as follows:
Connecting To The Integrated 9 Pin Connector
Pin Out of Integrated
Connector
PIN 3 should be connected to the Positive of the power source.
PIN 4 should be connected to the Negative ( Ground ) of the power
source.
PIN 2 provides the signal output and should be connected to the positive
terminal of the display, data acquisition system or voltmeter.
PIN 8 is the signal negative (ground) and should be connected to the
negative (Ground) terminal of the display, data acquisition system or
voltmeter.
Pin 6 is the input signal and should be connected to the positive terminal
of the voltage source. The (0-5VDC) voltage control signal should be
supplied from a low impedance source.
Pin 7 is the input signal negative (ground) and should be connected to
the negative (Ground) terminal of the voltage source.
Pins 1, 5, and 9 are not used.
Caution: Avoid high voltage static discharges to the input signal
connection. Do not short the input/output signal pins or allow
them to contact the power connections at any time. DAMAGE
WILL RESULT!
M-4271/0707, pg. 11 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
e) Connections For The 15 D Sub Connector
Using a suitable mating connector the pins of the integrated connector
should be wired as follows:
Connecting To The Integrated 15 Pin Connector
Pin Out of Integrated
Connector
PIN 7 should be connected to the Positive of the power source.
PIN 5 should be connected to the Negative ( Ground ) of the power
source.
PIN 2 provides the signal output and should be connected to the positive
terminal of the display, data acquisition system or voltmeter.
PIN 10 is the signal negative (ground) and should be connected to the
negative (Ground) terminal of the display, data acquisition system or
voltmeter.
Pin 8 is the input signal and should be connected to the positive terminal
of the voltage source. The (0-5VDC) voltage control signal should be
supplied from a low impedance source.
Pin 1 is the input signal negative (ground) and should be connected to
the negative (Ground) terminal of the voltage source.
Pins 3, 4, 6, 9, 11, 12, 13, 14 and 15 are not used.
Caution: Avoid high voltage static discharges to the input signal
connection. Do not short the output signal pins or allow them to
contact the power connections at any time. DAMAGE WILL
RESULT!
M-4271/0707, pg. 12 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
f) Using a 0-5VDC Input / Output Power Adapter Package.
An optional 0-5VDC Input / Output Power Adapter Package is available for
use with the FMA 3200/3400 Series. This consists of a power source
(115VAC or 230VAC), a connection hub and two cable assemblies with pig-
tail (soldered wire) ends. This should be assembled as shown in the
following diagram.
Assembling a FMA 3215PW Power Adapter Package
(the FMA 3223PW Power Adapter Package is similar)
The RED connector should be inserted in the RED socket on the
connection hub. The WHITE connector should be inserted in the WHITE
socket on the connection hub.
The cable with a RED connector provides the input signal. The RED wire
of this cable should be connected to the positive terminal of the voltage
source. The (0-5VDC) voltage control signal should be supplied from a low
impedance source. The bare wire of this cable assembly is the input
signal negative (ground) and should be connected to the negative
(Ground) terminal of the voltage source.
The cable with a WHITE connector provides the signal output. The
WHITE wire should be connected to the positive terminal of the display,
data acquisition system or voltmeter with an impedance of greater than
2.5 kΩ (kilo ohms). The bare wire of this cable assembly is the signal
negative (ground) and should be connected to the negative (Ground)
terminal of the display, data acquisition system or voltmeter.
Caution: Avoid high voltage static discharges to the input signal
connection. Do not short the output signal wires or allow them to
contact the power wires at any time. DAMAGE WILL RESULT!
M-4271/0707, pg. 13 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
C.
Operation
1. Warm Up
Before applying power to the unit check all tubing and electrical
connections. Once correct installation is verified switch on the power. The
unit should then be allowed to warm up for 5 minutes before gas pressure
is applied.
2. Verification of Zero
Flow through the unit should be stopped by sealing or capping the inlet of
the controller. It is not adequate to only stop flow by turning off the gas
supply or closing a valve as there may be a leak in the system. This would
give a false reading.
After 5 minutes, the zero should be stable when there is no flow through
the unit. If after 10-15 minutes the output is still not zero volts (within
±0.05 volts) the unit should be adjusted as detailed in section C part 6.
It should be noted that power supply voltage variations and changes in
ambient temperature can have an effect on zero readings.
3. Flow Readings
Each controller is factory calibrated for a specific flow range and gas (or
gas mixture). The calibration gas and flow range are shown on the unit’s
label and calibration certificate.
By monitoring the voltage output signal it is possible to determine the flow
rate of the gas. Units are configured so that an output signal of 5.0VDC is
provided when the maximum flow (i.e. Full Scale flow) is passing through
the unit. The output signal is linear and scaleable enabling calculation of
flow rates with in the sensor’s range. For example:
For a flow range of 0-500sccm:
At 500sccm the output signal would be 5VDC
If the output signal were 3.5VDC then the flow rate would be:
500 ÷ 5 × 3.5 = 350sccm
If the maximum flow rate is exceeded non-linear and inaccurate readings
will result.
Units may be used for gases other than the calibration gas. In this case a
“K Factor” would need to be applied and a corrected value calculated using
the following formula:
M-4271/0707, pg. 14 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
Q1 / Q2 = K1 / K2
Q1 is the flow rate of the new gas
Q2 is the flow rate of the original calibration gas
K1 is the K factor of the new gas
K2 is the K factor of the original calibration gas
Q1 = (K1 / K2) Q2
If K2 is larger than K1 then linear results will only be achieved if the unit
does not exceed 5(K1/ K2)VDC for the full scale output.
Example 1
For a 0-200sccm unit calibrated for air the flow at 5.0VDC would be
200sccm. The K factor for air is 1. If the unit is used with Helium (K factor
1.454 relative to air) then the flow at 5VDC (i.e. the maximum flow) would
be (1.454/1)200 = 290.8 sccm
Example 2
For a 0-10.0 l/min unit calibrated for Argon the flow at 5.0VDC would be
10.0l/min. The K factor for Argon is 1.45. If the unit is used with Carbon
Dioxide (K factor 0.74) then the flow rate 5.0VDC would be
(0.74/1.45)10.0 = 5.10l/min
The accuracy of readings using K factors is not as good as that achieved
for the calibration gas. The accuracy obtained (typically ±3% for K factors
similar to the calibration gas) depends on the gas being used and the flow
rate.
For a list of common K Factors see Section J.
4. Changing The Flow Rate Set-Point (Using An External Voltage
Source)
The required flow rate is selected by adjusting the set-point voltage. The
normal control signal voltage is 0-5VDC with 0VDC corresponding to zero
flow and 5VDC being equivalent to the maximum rated flow of the unit.
This input is linear and scaleable allowing different flow rates within the
range of the unit to be selected. For example:
For a flow range of 0-500sccm:
A 5 VDC Input Signal would correspond to a flow rate of 500sccm
If a flow rate of 300sccm were required then the set-point would
be:
(300 ÷ 500) × 5 = 3.0VDC
M-4271/0707, pg. 15 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
If a gas other than the calibration gas is used then the adjusted maximum
(full scale) flow for the unit should be calculated using the K Factor for
that gas (see section C3 above).
A zero or negative set-point voltage will cause the solenoid valve to close
fully. Whilst closed, the valve is configured to withstand pressures up to 60
psig (higher pressures on request).
Caution: The flow controller valve will open if the pressure
exceeds 60psig. For safety it is recommended that a separate
positive shut-off valve is installed upstream of the controller.
5. Changing The Flow Rate Set-Point – FMA3400/3400ST Series
Only
On the FMA 3400/3400ST Series the set-point may be input from an
external source or be supplied internally.
For an external set-point, dip switch 1 should be OFF and dip switch 2
ON. See section C4 above for details of how to adjust the set-point using
an external voltage source.
For an internal set-point, dip switch 1 should be ON and dipswitch 2 OFF.
Adjustment of the internal set-point is made by turning the coarse and fine
set-point potentiometers on the front panel of the display, with the gas is
flowing, until the desired flow rate is achieved.
FMA 3400/3400ST Series Set-Point Potentiometers
6. Power Save Mode.
To improve valve performance and reliability over time, the FMA
3200/3400 Series features a Power Save Mode. This is activated after a
prolonged application of a zero or negative set-point. When a control
voltage greater than 0 VDC is applied after the Power Save Mode has been
initiated there may be a short delay (1-2 secs) before the valve actuates.
M-4271/0707, pg. 16 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
7. Zero Adjustments
The zero should be checked as detailed in section C part 2. If an
adjustment is needed the Zero Potentiometer should be carefully turned
until the output (VDC) becomes zero.
Caution: Do NOT adjust the Gain Potentiometer when adjusting
the zero or the unit will need to be recalibrated.
Making Zero Adjustments Using a Small Flathead Screwdriver
Care should be taken to only make small adjustments to the zero
potentiometer. If too much of an adjustment is made and difficulties are
being experienced in achieving a zero reading then turn the potentiometer
fully anti-clockwise and begin making small clockwise adjustments until a
zero reading is obtained.
8. Recalibration
If recalibration is required please contact the Omega Engineering
Customer Service Department.
9. Changing the Calibration Gas – FMA 3400/3400ST Series Only
The FMA 3400/3400ST Series may be calibrated for up to three gases.
These gases, their corresponding flow ranges and accuracy specifications
are detailed on the calibration certificate.
The calibration gas required is determined by selecting the corresponding
dip switch on the front panel of the display.
M-4271/0707, pg. 17 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
FMA 3400/3400ST Series Dip Switches
Dip switch 4 is allocated to the primary calibration gas.
Dip switch 5 is allocated to the second calibration gas (if applicable).
Dip switch 6 is allocated to the third calibration gas (if applicable).
To select the gas, the dip switch should be turned ON. All other switches
allocated to gases (i.e. 4, 5 or 6 except the required switch/gas) should be
set to OFF.
D.
Maintenance and Product Care
1. General
Inlet filters should be periodically checked and cleaned or replaced as
necessary.
Regularly check all electrical and process connections for damage or
deterioration.
If the sensor is to be stored, keep both the inlet and outlet ports sealed.
Do not allow any liquid or moisture to enter the sensor or damage will
occur.
2. Returning Units for Repair or Recalibration
To return a unit for repair or recalibration please contact the Omega
Engineering Customer Service Department. An Authorized Return (AR)
number will then be issued. The AR number should then be noted on the
outside of the package and on any correspondence. Further details may be
found on page 25 of this manual.
M-4271/0707, pg. 18 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
E.
Specifications
Series
FMA 3200
FMA 3400
FMA 3200ST
FMA 3400ST
Accuracy
(including linearity)
±1.5% of
Full Scale*
±1.5% of
Full Scale*
Second and
third gases
±3.0% F.S.*
±1.5% of
Full Scale*
±1.5% of
Full Scale*
Second and
third gases
±3.0% F.S.*
Repeatability
±0.25% Full Scale*
Pressure Rating
Pressure Sensitivity
Temperature Rating
150 psig (10.3 bar)
500 psig (34.5 bar)
±0.02% Full Scale* per psi (per 69 mbar)
Operating Range: 5 to 55ºC
Recommended Range (for best performance) : 10 to 40ºC
Storage Range: 0 to 70ºC
Temperature
Sensitivity
±0.15% F.S.* or less per ºC
Valve
Normally Closed
Positive Shut-off up to 60psig (4 bar)
Body Leak Integrity
Wetted Materials
1x10-7 sccs of He
Aluminum
304 Stainless Steel
316 Stainless Steel
303 Stainless Steel
304 Stainless Steel
316 Stainless Steel
Epoxy
O-Ring Material
Fitting Material
Viton®
Choose from acetal, brass, or stainless steel
Recommended
Filtration
20 microns or less
Optional inline filters available
Compatible gases
Output Signal
Clean, dry gases compatible with wetted materials
0-5VDC, Impedance greater than 2.5 KΩ
0-5VDC, Integrated 2MΩ load
External Set-point
Signal
Internal Set-point
Signal
N/A
N/A
Front Panel
Adjustment
N/A
Front Panel
Adjustment
Warm-Up Time
Less than 5 minutes
Integrated Display
3½ digit
N/A
3½ digit
Typical Power
Consumption
Standard: 12 VDC @ 250 mA (12.5-15 VDC)
“E” Suffix: 24 VDC @ 130 mA (22-25 VDC)
Peak Power
Consumption
Standard: 12 VDC @ 400 mA (12.5-15 VDC)
“E” Suffix: 24 VDC @ 260 mA (22-25 VDC)
Electrical
Connections
Integrated 36” (92 mm) cable, terminated with:
Standard: 6-pin Mini-DIN male (PS/2 Style)
D1 Option: 9-pin D-Sub male
D2 Option: 15-pin D-Sub male
Certifications
CE Approved
89/336/EEC (EN 55011 & EN 50082-1)
73/23/EEC Low Voltage Directive
*Specifications from 10-100% of rated flow. Linearity is best fit straight line. All calibrations
performed with air unless otherwise stated on calibration certificate.
M-4271/0707, pg. 19 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
F.
Dimensions
ALL DIMENSIONS IN INCHES (MILLIMETERS IN BRACKETS)
FMA 3200/3200ST Series - 1/4” Stainless Fittings Shown
M-4271/0707, pg. 20 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
FMA 3400/3400ST Series - 1/4” Stainless Fittings Shown
M-4271/0707, pg. 21 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
G.
Gas K Factors
Chemical
Symbol
Gas
K Factor
Acetylene
Air
C2H2
-
0.589
1.000
1.438
0.260
0.739
1.000
0.598
0.330
0.354
0.385
0.420
0.460
0.570
1.458
1.011
1.440
0.721
1.443
0.990
1.000
0.710
0.991
0.446
0.383
0.690
1.437
Argon
Ar
Butane
C4H10
CO2
D2
Carbon Dioxide
Deuterium
Ethylene
Freon 11
Freon 12
Freon 13
Freon 14
Freon 22
Germane
Helium
C2H4
CCL3F
CCL2F2
CCLF3
CF4
CHCLF2
GeH4
He
Hydrogen
Krypton
H2
Kr
Methane
Neon
CH4
Ne
Nitric Oxide
Nitrogen
Nitrous Oxide
Oxygen
NO
N2
N2O
O2
Ozone
O3
Propane
Sulfur Dioxide
Xenon
C3H8
SO2
Xe
These K Factors are given for reference only and are not intended as a recommendation of
application suitability. Accuracy and response will be affected depending on the gas and
flow range. Check the compatibility of all wetted materials before using any gas other than
the calibration gas for the unit.
M-4271/0707, pg. 22 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
H.
Troubleshooting Guide
Symptom
Possible Cause
Method of Correction
Clicking noise from
controller
Unit in error mode
Check there is sufficient
pressure and that the flow
path is not restricted or
blocked
No response
Unit wired incorrectly
Loose connection
Check wiring is according to
Section B5
Check all connectors and
wiring
Damaged connector pins
Blocked flow path
Contact Omega Engineering
Check flow path for
obstructions.
Piping leak before sensor
Insufficient power
Check all piping and
connections.
Check the power supply
output and increase if
necessary
Output load resistance too low
Flow too low for the unit
Ensure the voltmeter or
data acquisition system or
display has an impedance of
greater than of 2.5kohm
Ensure that the flow being
measured is within the
capabilities of the unit
Unit damaged or faulty
Particles in flow path
Contact Omega Engineering
Inaccurate control
Add filtration before the
sensor.
Flow path obscured
Remove any debris or
blockage in the flow path
eg. PTFE tape.
Unit calibrated for a different
gas
Check calibration certificate
and apply a “K” Factor to
readings if necessary.
Gas composition is variable
Fittings have been changed
Contact Omega Engineering
Replace the factory installed
fittings
Moisture in gas
Ensure gas is clean and dry
Insufficient warm-up period
Allow the unit to warm-up
for at least 5 minutes.
Zero drift
Verify the zero and adjust
as necessary as explained in
Section C
The gain potentiometer has
been adjusted
Contact Omega Engineering
Unit needs recalibration
Flow too high for the unit
Contact Omega Engineering
Ensure that the flow being
measured is within the
capabilities of the unit
M-4271/0707, pg. 23 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
Symptom
Possible Cause
Method of Correction
Inaccurate control
Insufficient or varying power
Check the power supply
output and increase if
necessary
Insufficient pressure
Varying pressure
Ensure the pressure (an
differential pressure) is high
enough o operate the unit.
Check the stability of the
pressure regulation and
improve if necessary.
Ambient temperature too high
or too low
Place the unit in a suitable
environment
Output load resistance too low
Ensure the voltmeter or
data acquisition system or
display has an impedance of
greater than of 2.5kohm
Gas temperature too high or
too low
Ensure the gas temperature
is within the recommended
operating range
Unit damaged or faulty
Contact Omega Engineering
Problems with
rezeroing
Gas flow through unit not
completely stopped
Ensure there is no flow
through the unit. The
easiest way to do this is to
plug both the inlet and
outlet.
Severe fluctuations in the
ambient temperature e.g. unit
in direct sunlight
Carry out the rezero
procedure in a stable
environment
Unstable power supply
Check the stability and
suitability of the power
source
Insufficient warm-up period
Allow the unit to warm-up
for at least 5 minutes.
M-4271/0707, pg. 24 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
.
M-4271/0707, pg. 25 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
M-4271/0707, pg. 26 of 26
Download from Www.Somanuals.com. All Manuals Search And Download.
|