Omega FMA1800A User manual

FMA1700A & FMA1800A
Mass Flow Meter
TM
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User’s Guide
NORWALK, CT

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The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains,
and reserves the right to alter specifications without notice.
Servicing North America:
U.S.A. Omega Engineering, Inc.
Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
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TABLE OF CONTENTS
1. UNPACKING THE FMA1700A/1800A MASS FLOW METER.....................
1.1 Inspect Package for External Damage.................................................
1.2 Unpack the Mass Flow Meter...............................................................
1.3 Returning Merchandise for Repair.......................................................
2. INSTALLATION........................................................................................
2.1 Primary Gas Connections.................................................................
2.2 Electrical Connections......................................................................
2.3.1 Remote LCD Readouts.....................................................................
2.3.2 Panel Mounting Readouts................................................................
3. PRINCIPLE OF OPERATION...................................................................
4. SPECIFICATIONS...................................................................................
4.1 CE Compliance.................................................................................
5. OPERATING INSTRUCTIONS..................................................................
5.1 Preparation and Warm Up..................................................................
5.2 Flow Signal Output Readings..........................................................
5.3 Swamping Condition.......................................................................
6. MAINTENANCE.........................................................................................
6.1 Introduction......................................................................................
6.2 Flow Path Cleaning...........................................................................
6.2.1 Restrictor Flow Element (RFE)........................................................
6.2.2 FMA1700A/1800A Series Max. Flow 15 L/min...................................
7. CALIBRATION PROCEDURES.................................................................
7.1 Flow Calibration...............................................................................
7.2 Calibration of FMA1700A/1800A Mass Flow Meters........................
7.2.1 Connections and Initial Warm Up.....................................................
7.2.2 ZERO Adjustment.............................................................................
7.2.3 SPAN Adjustment............................................................................
7.3 Linearity Adjustment..........................................................................
7.3.1 Connections and Initial Warm Up....................................................
7.3.2 ZERO Adjustment.............................................................................
7.3.3 25% Flow Adjustment (using R33 potentiometer)...........................
7.3.4 10% Flow Adjustment......................................................................
7.3.5 25% Flow Adjustment (using R52 potentiometer)..........................
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7.3.6 50% Flow Adjustment....................................................................
7.3.7 75% Flow Adjustment....................................................................
7.3.8 100% Flow Adjustment....................................................................
7.4 LCD Display Scaling.........................................................................
7.4.1 Access LCD Display Circuit..............................................................
7.4.2 Adjust Scaling..................................................................................
7.4.3 Change Decimal Point......................................................................
8. TROUBLESHOOTING.............................................................................
8.1 Common Conditions........................................................................
8.2 Troubleshooting Guide.....................................................................
8.3 Technical Assistance.......................................................................
9. CALIBRATION CONVERSIONS FROM REFERENCE GASES.......................
APPENDIX 1 COMPONENT DIAGRAM.........................................................
APPENDIX 2 GAS FACTOR TABLE (“K” FACTORS)........................................
APPENDIX 3 DIMENSIONAL DRAWINGS......................................................
PARTS OF THE FLOW METER..............................................
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1
1. UNPACKING THE FMA1700A/1800A
MASS FLOW METER
1.1 Inspect Package for External Damage
Remove the Packing List and verify that you have received all equipment. If you
have any questions about the shipment, please call the OMEGA7Customer
Service Department at 1-800-622-2378 or [phone].
Your FMA1700A/1800A Mass Flow Meter was carefully packed in a sturdy card-
board carton, with anti-static cushioning materials to withstand shipping shock.
Upon receipt, inspect the package for possible external damage. In case of exter-
nal damage to the package contact the shipping company immediately.
1.2 Unpack the Mass Flow Meter
Open the carton carefully from the top and inspect for any sign of concealed ship-
ping damage. In addition to contacting the shipping carrier please forward a copy
of any damage report to OMEGA7directly.
When unpacking the instrument please make sure that you have all the items
indicated on the Packing List. Please report any shortages promptly.
1.3 Returning Merchandise for Repair
Please contact an OMEGA7 customer service representative and request a
Return Authorization Number (AR).
It is mandatory that any equipment returned for servicing be purged and neutral-
ized of any dangerous contents including but not limited to toxic, bacterially infec-
tious, corrosive or radioactive substances. No work shall be performed on a
returned product unless the customer submits a fully executed, signed SAFETY
CERTIFICATE. Please request form from the Service Manager.
2. INSTALLATION
2.1 Primary Gas Connections
Please note that the FMA1700A/1800A Mass Flow Meter will not operate with liq-
uids. Only clean gases are allowed to be introduced into the instrument. If gases
are contaminated they must be filtered to prevent the introduction of impediments
into the sensor.
CAUTION: Some of the IC devices used in the FMA1700A & FMA1800A are
Electro Static Discharge (ESD) sensitive and may be damaged by improper
handling. When wiring interface connector, adjusting or servicing the meter,
use of a grounded ESD protection wrist strap is required to prevent inadvertent
damage to the CMOS integral solid state circuitry. When 9 pin Interface
D-connector is not used do not remove factory installed ESD protection cover.


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CAUTION: IT IS THE USERS RESPONSIBILITY TO DETERMINE IF THE
INSTRUMENT IS APPROPRIATE FOR THEIR OXYGEN APPLICATION, AND FOR
SPECIFYING O2 CLEANING SERVICE IF REQUIRED. OMEGA IS NOT LIABLE
FOR ANY DAMAGE OR PERSONAL INJURY, WHATSOEVER, RESULTING FROM
THE USE OF THIS INSTRUMENT FOR OXYGEN GAS.
Attitude sensitivity of the Mass Flow Meter is ±15. This means that the gas flow
path of the Flow Meter must be horizontal within those stated limits. Should there
be need for a different orientation of the meter, re-calibration may be necessary. It
is also preferable to install the FMA1700A/1800A transducer in a stable environ-
ment, free of frequent and sudden temperature changes, high moisture, and
drafts.
Prior to connecting gas lines inspect all parts of the piping system including fer-
rules and fittings for dust or other contaminant’s.
Be sure to observe the direction of gas flow as indicated by the arrow on the front
of the meter when connecting the gas system to be monitored.
Insert tubing into the compression fittings (except FMA1700A/1800A Series Max
Flow 1000 L/min) until the ends of the properly sized tubings home flush against
the shoulders of the fittings. Compression fittings are to be tightened according to
the manufacturer's instructions to one and one quarter turns. Avoid over tighten-
ing which will seriously damage the Restrictor Flow Elements (RFE's)!
Using a Helium Leak Detector or other equivalent method perform a thorough
leak test of the entire system. (All FMA1700A/1800A are checked prior to ship-
ment for leakage within stated limits. See specifications in this manual.)
2.2 Electrical Connections
CAUTION: Some of the IC devices used in the FMA1700A & FMA1800A are
Electro Static Discharge (ESD) sensitive and may be damaged by improper
handling. When wiring interface connector, adjusting or servicing the meter,
use of a grounded ESD protection wrist strap is required to prevent inadver
tent damage to the CMOS integral solid state circuitry. When 9 pin interface
D-connector is not used do not remove factory installed ESD protection cover.

CAUTION: WIRING THE FMA1700A & FMA1800A METER WITH THE POWER
ON MAY RESULT IN INTERNAL DAMAGE! PLEASE MAKE ALL WIRING
CONNECTIONS BEFORE SWITCHING ON THE POWER.

All FMA1700A & FMA1800A models require power supplies with nominal current
rating of at least 200 mA. The operating power input is supplied via the DC power
jack or the 9-pin “D” connector located at the side of the flow transducer enclosure.
On FMA1700A & FMA1800A's purchased without an LCD readout, a readout
panel meter, digital multimeter, or other equivalent device is required to observe
the flow signal.

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PIN FUNCTION
1Remote LCD display signal
20 to 5 VDC output indication
30 to 5 VDC common
4Power supply, positive
5Power supply, common
6Remote LCD display reference
7(unassigned)
84 to 20 mA output indication
self-powered (sourcing type,
non-isolated)
94 to 20 mA common (return)
FIGURE 2.a - 9-PIN “D” CONNECTOR PINOUTS FOR FMA1700A/1800A TRANSDUCER
The FMA1700A & FMA1800A flow meters have universal power input and can be
used with any power supply voltage between +12 and +26 Vdc.
CAUTION: BEFORE CONNECTING POWER SUPPLY CHECK YOUR METER
SERIAL NUMBER AND POWER SUPPLY REQUREMENTS LABEL LOCATED ON
THE FLOW METER BACK COVER. DO NOT CONNECT POWER SUPPLY WITH
VOLTAGE ABOVE 26 VDC. EXCEEDING SPECIFIED MAXIMUM POWER SUPPLY
VOLTAGE LIMIT MAY RESULT IN DEVICE PERMANENT DAMAGE.

IMPORTANT NOTES:
In general, “D” Connector numbering patterns are standardized. There are, how-
ever, some connectors with nonconforming patterns and the numbering sequence
on your mating connector may or may not coincide with the numbering sequence
shown in our pin configuration table above. It is imperative that you match the
appropriate wires in accordance with the correct sequence regardless of the par-
ticular numbers displayed on your mating connector.
Make sure power is OFF when connecting or disconnecting any cables in the
system.
When connecting power to the FMA1700A/1800A mass flow meter via the DC
power jack, do not connect any power supply to the 9-pin “D” Connector. The DC
power jack has a center positive polarity.
When battery use is required to power the FMA1700A/1800A, use only the
optional battery and accompanying charger available from OMEGA7.
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CAUTION: Resettable fuse will not protect meter if power supply voltage
exceeds maximum voltage specified for particular model.

In order to operate flow meter within the specification the cable length for analog
0-5 Vdc output and remote LCD display may not exceed 9.5 feet (3 meters).
Use of the FMA1700A/1800A flow transducer in a manner other than that speci-
fied in this manual or in writing from OMEGA7, may impair the protection provid-
ed by the equipment.
2.3.1 Remote LCD Readouts
FMA1700A/1800A Mass Flow Meters are available with optional remote reading
LCD displays supplied with a three foot long wire to accommodate most applica-
tions. This configuration includes the upper block element which serves as the
LCD readout mounting. Special lengths of remote extension wiring (up to 9.5 feet
[3 meters]) are available on request.
2.3.2 Panel Mounting Readouts
Another option for the FMA1700A/1800A Mass Flow Meter is the Panel Mounting
Remote Readout. In this configuration the LCD readout is supplied with a three
foot long extension wire, and no aluminum housing around the LCD. The LCD
readout for panel mounting includes a bezel with two plastic screws which conve-
niently fit into a rectangular cut-out for panel mounting (see Figure 2.b).
The power input is protected by 300 mA M (medium time-lag) resettable fuse. If a
shorting condition or polarity reversal occurs, the fuse will cut power to the flow
transducer circuit. Disconnect the power to the unit, remove the faulty condition,
and reconnect the power. The fuse will reset once the faulty condition has been
removed.
FIGURE 2.b - CUTOUT DIMENSIONS FOR LCD PANEL MOUNTING

3. PRINCIPLE OF OPERATION
The stream of gas entering the Mass Flow transducer is split by shunting a small
portion of the flow through a capillary stainless steel sensor tube. The remainder
of the gas flows through the primary flow conduit.The geometry of the primary con-
duit and the sensor tube are designed to ensure laminar flow in each branch.
According to principles of fluid dynamics the flow rates of a gas in the two laminar
flow conduits are proportional to one another. Therefore, the flow rates measured
in the sensor tube are directly proportional to the total flow through the transducer.
In order to sense the flow in the sensor tube, heat flux is introduced at two sec-
tions of the sensor tube by means of precision wound heater-sensor coils. Heat is
transferred through the thin wall of the sensor tube to the gas flowing inside. As
gas flow takes place heat is carried by the gas stream from the upstream coil to
the downstream coil windings. The resultant temperature dependent resistance
differential is detected by the electronic control circuit. The measured gradient at
the sensor windings is linearly proportional to the instantaneous rate of flow tak-
ing place.
An output signal is generated that is a function of the amount of heat carried by
the gases to indicate mass-molecular based flow rates.
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4. SPECIFICATIONS
FLOW MEDIUM: Please note that FMA1700A/1800A Series Max Flow 15, 50, 100, 200,
500 and 1000 L/min Mass Flow Meters are designed to work with clean gases only. Never
try to meter or control flow rates of liquids with any FMA1700A/1800A.
CALIBRATIONS: Performed at standard conditions [14.7 psia (1.01 bars) and 70 FF
(21.1 FC)] unless otherwise requested or stated.
ENVIRONMENTAL (per IEC 664): Installation Level II; Pollution Degree II.
ACCURACY: FMA1700A/1800A Series Max Flow 15, 50 and 100 L/min ±1.0% F.S.
FMA1700A/1800A Series Max Flow 200, 500 and 1000 L/min. ±1.5% F.S.
REPEATABILITY: ±0.25% of full scale.
TEMPERATURE COEFFICIENT: 0.15% of full scale/ FC.
PRESSURE COEFFICIENT: 0.01% of full scale/psi (0.07 bar).
RESPONSE TIME: 800 ms time constant; approximately 2 seconds to within ±2% of set
flow rate for 25% to 100% of full scale flow rate.
GAS PRESSURE: 1000 psig (69 bars) FMA1700A/1800A Series Max Flow 15, 50 and 100;
500 psig (34.5 bars) FMA1700A/1800A Series Max Flow 200, 500 and 1000 L/min.
Optimum pressure is 20 psig (1.4 bars).
GAS AND AMBIENT TEMPERATURE: 32 FF to 122 FF (0 FC to 50 FC).
14 FF to 122 FF (-10 FC to 50 FC) - Dry gases only.
RELATIVE GAS HUMIDITY: Up to 70%.
LEAK INTEGRITY: 1 x 10- 7 sccs He max. to the outside environment.
ATTITUDE SENSITIVITY: Incremental deviation of up to 1% full scale from stated accuracy,
after re-zeroing.
OUTPUT SIGNALS: Linear 0-5 VDC (1000 Ωminimum load impedance) and 4-20 mA self-
powered sourcing type, non-isolated, (0-500 Ω loop resistance); 20 mV peak to peak max noise.
Contact Omega© for optional RS232 or RS485 interfaces.
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TRANSDUCER INPUT POWER:
FMA1700A & FMA1800A models with universal power input between +12 and +25 VDC, 200
mA maximum;
Power input is protected by a 300 mA M (medium time-lag) resettable fuse, and a rectifier
diode for polarity protection.