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Programmable Mass Flow Meter and Totalizer


Item# FMA-4311

In stock

Lead Time (If not in stock): 6 weeks
Programmable Mass Flow Meter and Totalizer FMA-4311 FMA-4311
  • 23 Selectable Engineering Units (Including User Defined)
  • Programmable Totalizer
  • High and Low Gas Flow Alarms
  • Two Sets Programmable SPDT Relays with Latching Feature

FMA-4311 Model Options

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Flow Range
Process Connection Size:
Media Type
Communications Protocol
Output Signal
Wetted Materials
Max Operating Pressure
Max Process Temperature
Process Connection Type:

The FMA-4100/4300 Series flow rate can be displayed in 23 different volumetric flow or mass flow engineering units including a user specific selection. Flowmeters can be programmed remotely via RS232 or RS485 (optional). FMA-4100/4300 flowmeters support various functions including, programmable flow totalizer, high and low flow alarm, automatic zero adjustment, 2 relay outputs, jumper selectable 0 to 5 Vdc or 4 to 20 mA analog outputs, status LED diagnostic, storage of up to 10 different gas calibrations, internal or user-specific K-factors. Display models have local 2 lines x 16 characters LCD display with adjustable back light provides flow, total and diagnostic reading simultaneously. The digital RS232 or RS485 (optional) interface provides access to applicable internal data including, flow, CPU temperature, auto zero, totalizer and alarms settings, gas table, conversion factors and engineering units selection, dynamic response compensation and linearization table adjustment. The analog interface provides 0 to 5 Vdc or 4 to 20 mA (jumper selectable) outputs for flow reading.

The FMA-4100/4300 supports automatic sensor zero offset adjustment which can be activated locally via the maintenance push button or remotely via digital interface. The auto zero feature necessitates a condition of absolutely no flow through the meter during the adjustment process. Provisions are made to either start, read, or save the current auto zero value via digital commands. Digital totalizer commands include: set to zero, start at a preset flow, assign action to a preset value, start/stop totalizing and read. High and Low gas flow alarm limits can also be preprogrammed via digital interface. Alarm action can be assigned with preset delay interval (0 to 3600 seconds) to activate the contact closer (separate for high and low alarm). Latch mode control feature allows each relay to be latched on or follow the corresponding alarm status.

FMA-4100/4300 Transducers should not be used for monitoring Oxygen gas unless specifically clean and prepared for such application. See below for ordering instructions.


Calibrations: Performed at standard conditions [101.4 kPa (14.7 psia) and 21.1°C (70°F)] unless otherwise requested or stated
Environmental (PER IEC 664): Installation Level II; Pollution Degree II
Flow Accuracy (Including Linearity): ±1% of FS at calibration temperature and pressure
Repeatability: ±0.15% of full scale
Flow Temperature Coefficient: 0.15% of full scale/°C or better
Flow Pressure Coefficient: 0.01% of full scale/psi (6.895 kPa) or better
Turndown Ratio: 50:1
Flow Response Time: 600 ms time constant; approximately 2 seconds to within ±2% of set flow rate for 25 to 100% of full scale flow
Max Gas Pressure: 3447 kPa gauge (500 psig)
Max Pressure Drop: Max Flow &#LE; 10 SLM: 1.28 kPa (0.18 psi)
                             Max Flow < 10 SLM: 27.58 kPa (4 psi)
Gas and Ambient Temperature: 5 to 50°C (41 to 122°F)
Relative Gas Humidity: Up to 70%
Leak Integrity: 1 x 10-9 SCCS He max to the outside environment
Attitude Sensitivity: Deviation of up to 1% from stated accuracy, after re-zeroing
Output Signals: Linear 0 to 5 Vdc (3000 Ω min load impedance); Linear 4 to 20 mA (500 Ω max loop resistance). Max noise 20 mV peak to peak (for 0 to 5 Vdc output)
Relay: SPDT (30 Vdc, 1A)
Transducer Input Power: 11 to 26 Vdc, 100 mV max peak to peak output noise
Power Consumption: +12 Vdc (200 mA max); +24 Vdc (100 mA max); Circuit board has built-in polarity reversal protection, 300 mA resettable fuse provide power input protection
Wetted Materials:
    Standard Aluminum Models: Anodized aluminum, brass, 316 stainless steel, FKM O-rings
    Optional Stainless Steel Models: 316 stainless steel, FKM O-rings
    Optional O-ring Materials: Buna, EPR (Ethylene Propylene), or perfluoroelastomer
Inlet and Outlet Connections:
    Model FMA-4100/4300: Standard 6.35 mm (1/4") compression fittings for up to 50 SLM.
                                       Standard 9.53mm (3/8") for models above 60 SLM
    Optional: 3.18 or 9.53 mm (1/8" or 3/8") compression fittings
Display (FMA-4300 Models): Local 2 lines x 16 characters LCD with adjustable backlight (2-lines of text)
Calibration Options: Standard is one 10-point NIST traceable calibration. Optional, up to 9 additional calibrations may be ordered at additional charge. Contact OMEGA for additional information
CE Compliance: EMC compliance with 89/336/EEC as amended
    Emission Standard: EN 55011:1991, Group 1
    Class A Immunity Standard:
    EN 55082-1:1992
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Rated 1 out of 5 by from Not happy with support and product received The first unit came in without the digital display I needed and I had to reorder. The second arrived without a field functional power supply. Only pigtails to plug into a power supply. Also, not what I wanted. I will rethink using your products in the future.
Date published: 2016-11-01
Rated 5 out of 5 by from Order promptness I purchased the item for a corporate buyer but he was pleased that what was ordered was what was delivered and he also commented on the quickness of the processing of the order.......
Date published: 2022-10-14
Rated 5 out of 5 by from Simple and Accurate. Install this on to measure the flow in a tube and nozzle as a testing fixture. The relays were used to set the good part to pass and were helpful. Only problem was the software was not available online and very limited. Made our own C# data acquisition software using RS232c cable and recorded values in CSV file. Also I will recommend to use LCD version, because you may need to see the live reading.
Date published: 2021-12-21
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You don't have the programming software copy available online. Cannot believe 2021 still no downloadable solution available?

Asked by: Yasir
I apologize for the inconvenience. Please feel free to contact us at for further information
Answered by: Application Engineer JM
Date published: 2021-10-12
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