Omega Products FMA 3100ST Installation Manual
FMA 3100/3100ST/3300/3300ST Series
Thermal Mass Flow Sensors and Meters
M-4270/0707, pg. 2 of 29
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 SENSOR.
TABLE OF CONTENTS
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 Sensor Or Flow Meter ...............................................6
3. Tubing Connections..............................................................................7
a) General .......................................................................................7
b) High Flow Units (0-100 L/min and above)............................................7
5. Electrical Connections ...........................................................................7
a) Overview ....................................................................................7
b) Connecting the 6 Pin Mini Din Connector.............................................8
c) Connecting the 6 Pin Mini Din Connector And FMA 3000C Cable...........9
d) Connections for the 9 Pin D Sub Connector........................................10
e) Connections for the 15 Pin D Sub Connector ...................................... 11
f) Using the 0-5VDC Output Power Adapter Package ..............................12
C. Operation ............................................................................................. 13
1. Warm-Up .......................................................................................... 13
2. Verification Of Zero ............................................................................13
3. Flow Readings....................................................................................13
4. Zero Adjustments................................................................................14
5. Recalibration...................................................................................... 15
D. Maintenance And Product Care................................................................15
1. General............................................................................................. 15
2. Returning Units For Repair Or Recalibration............................................15
E. Specifications......................................................................................... 16
F. Dimensions............................................................................................17
G. Gas K Factors ........................................................................................25
H. Trouble Shooting Guide ..........................................................................26
M-4270/0707, pg. 3 of 29
A. Introduction
1. Unpacking
All sensors 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.
Contents of Box- Sensor, Calibration Certificate & Manual
FMA 3100 Series shown; FMA 3300 series has an integrated display.
Caution: Take care not to
drop
your sensor. 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 28 for more details).
2. Product Overview and Principle of Operation
The FMA 3100/3300 Series flow sensors and flow meters from Omega
Engineering are capable of measuring virtually any clean, dry gas as low
as 0-20 sccm or as high as 0-500 l/min. Repeatable results are achieved
using a patented thermal mass flow sensor design. This proven design
M-4270/0707, pg. 4 of 29
minimizes zero drift while maintaining fast response and linear outputs
with virtually no maintenance.
The FMA 3100/3300 Series utilizes
thermal 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.
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
sensor or flow meter is detailed on the product label.
B. Installation
1. General Considerations
It is recommended that a safety shut-off valve be installed upstream
(before) of the sensor.
All wetted parts should be checked for compatibility with the gas to be
used. If there are any incompatibilities e.g. highly corrosive gas, then the
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.
Pressure drop across the FMA 3100/3300 Series is approximately 0.08 psi
(6 millibar) at 100% of the rated flow.
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.
M-4270/0707, pg. 5 of 29
Pressure Drop vs. Percentage of the Full Scale
Rated Flow for the FMA 3100/3300 Series
0.08
0.07
0.06
0.05
0.04
PSID
0.03
0.02
0.01
0
0 102030405060708090100
% of Full Scale Rated Flow
Typical Pre ssure Drop
6
5
4
3
2
1
0
2. Mounting the Flow Sensor or Flow Meter.
The FMA 3100/3300 Series sensors have no particular orientation
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)
Bar
M-4270/0707, pg. 6 of 29
3. Tubing Connections
a) General
All tubing must be clean, dry and purged with clean dry air before
installation of the flow sensor or flow meter.
If the gas to be used may contain particles then a filter (20 microns or
less) should be installed upstream of (before) the unit.
Caution: Use only 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 Omega Engineering for assistance.
When connecting the sensor to the tubing, take care not to over-tighten
the fittings or leaking may occur.
b) High Flow Units (0-100 L/min and above)
It is recommended that tubing with a 0.5” (12.7 mm) outside diameter,
0.40” – 0.42” (10.16 mm – 10.67 mm) inside diameter is used. Using any
other tube size may effect the calibration.
High flow units should be installed with at least a 5” (127 mm) long
straight length of tube immediately before the sensor. For flow rates
above 200 L/min a straight length of at least 22” (559 mm) is
recommended. Using lengths shorter than these recommendations will
effect the calibration of the unit.
The manufacturer is able to calibrate high flow units for specific tubing
configurations. Please contact Omega Engineering for further details.
4. Electrical C onnections
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 3100/3300 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).
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.
M-4270/0707, pg. 7 of 29
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 for each unit.
b) Connecting To 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 Numbers For
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.
On the integrated 6-pin connector, PINS 4 & 5 are unused.
Caution: Do not short the output signal pins or allow them to
contact the power wires at any time. DAMAGE WILL RESULT!
M-4270/0707, pg. 8 of 29
c) Connecting The 6 P in Mini Din Connector and FMA 3 000C
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 pigtail lead of the FMA 3000C cable assembly should be connected as
follows:
The RED wire (Pin 2 on connector) should be connected to the Positive of
the power source.
The BLACK wire (Pin 6 on the connector) should be connected to the
Negative (Ground) of the power source.
The ORANGE wire (Pin 3 on the connector) provides the signal output
and should be connected to the positive terminal of the display, data
acquisition system or voltmeter.
The BROWN wire (PIN 1 on the connector) is the signal negative
(ground) and should be connected to the negative (Ground) terminal of
the display, data acquisition system or voltmeter.
On the FMA 3000C cable, the GREEN and YELLOW wires, if present, are
unused. On the integrated 6-pin connector, PINS 4 & 5 are unused.
The wire colors above describe the pigtail leads of the 50-C-X cable
assembly and may not correspond with the internal wiring of your flow
sensor.
Caution: Do not short the output signal wires or allow them to
contact the power wires at any time. DAMAGE WILL RESULT!
M-4270/0707, pg. 9 of 29
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