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Mass and Volumetric Flow Meters


Item# FMA-1607A

In stock

Lead Time (If not in stock): 3 weeks
Mass and Volumetric Flow Meters FMA-1607A FMA-1607A
  • Ranges of 0 to 0.5 SCCM Up to 0 to 3000 SLM
  • < 10ms Response Time—Field Adjustable
  • 130+ Gas Calibrations with Every Unit: Air, Ar, CH4, CO, CO2, Ethane, H2, He, N2, N2O, Neon, O2, Propane, Butane, Acetylene, Ethylene and more
  • Pressure, Temperature, and Volumetic and Mass Flow Simultaneously Displayed

FMA-1607A Model Options

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

The FMA-1600A Series mass and volumetric Omega's flow meters use the principle of differential pressure within a laminar flow field to determine the mass flow rate. A laminar flow element (LFD) insdie the meter forces the gas into laminar (streamlined) flow. Inside this region, the Poiseuille equation dictates that the volumetric flow rate be linearly related to the pressure drop along a fixed distance of the LFE. This, along with the viscosity of the gas, is used to accurately determine the volumetri flow rate. Separate absolute temperature and pressure sensors are incorporated and correct the volumetric flow rate to a set of standard conditions. This standardized flow rate is commonly called the mass flow rate and is reported in units such as standard cubic feet per minute (SCFM) or standard liters per minute (SLM).

Standard units include a 0 to 5 V output (4 to 20 mA optional) and RS232 communications. The gas select feature can be adjusted from the front of the keypad or via RS232 communications. Volumetric flow, mass flow, or absolute pressure, and temperature can be viewed or recorded through the RS232 connection. It is also possible to multi-drop up to 26 units on the same serial connection to a distance of 125'. These flowmeters are also available in a portable version for use in the field (-B models).

Accuracy: ±(0.8% of rdg + 0.2% FS)
Repeatability: ±0.2%
Turndown Ratio: 200:1
Response Time: 10 ms typical default response time for 63.2% of a step change. A variable register allows response time to be field adjustable to a certain extent via RS232 communications. The primary trade-off for response time is signal noise
Output: 0 to 5 Vdc standard
Operating Temperature: -10 to 50°C (14 to 122°F)
Zero Shift: 0.02% FS/°C/atm
Span Shift: 0.02% FS/°C/atm
Humidity Range: 0 to 100% non-condensing
Pressure (Max):
   FMA-1600A Series: 145 psig
   FMA-1600A Series: 50 psi differential
   FVL-1600A Series: 10 psig
   FVL-1600A Series: 10 psi differential
Measurable Flow Rate: 125% FS
Supply Voltage: 7 to 30 Vdc (15 to 30 Vdc for 4 to 20 mA output)
Supply Current: 35 mA typical current draw; 100 mA available supply recommended
Cable Connection: 8-pin mini DIN
Wetted Parts: 303 & 302 Stainless Steel, FKM Heat Cured Silicone Rubber, Glass Reinforced Polyphenylene Sulfide, Heat Cured Epoxy, Aluminum, Gold, Silicon, Glass. Contact Omega engineering for details.
-LSS (Option):316LSS, 303SS, 430FRSS, Perfluoroelastomer standard, FKM, EPDM, Buna, Neoprene Standard Pressure Drops (venting to atmosphere):
Max Flow Rate 0.5 to 50 SCCM 0.1 to 10 SLM 20 SLM 50 SLM 100 SLM 250 SLM 500 SLM 1000 SLM 1500 SLM
PSID 1 1 1 2 2.5 4.0 5.5 6.0 9.0
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Rated 4 out of 5 by from Good Mass Flowmeter Easy to setup and reliable. Easy to use. Remote operation needs expert installation but is easy to use after setup. Price could be lower to have a broader application.
Date published: 2016-11-17
Rated 5 out of 5 by from High performance flow meters My laboratory have ordered 2 1617A and 4 1619A flow meters and been satisfied with their performance.
Date published: 2023-12-17
Rated 3 out of 5 by from Need better software IT works well, but would love to see a better user interface to connect it to PC. Using PuTTY kind of sucks.
Date published: 2023-08-07
Rated 5 out of 5 by from Highly recommend Great product! I was worried this wouldn't arrive in time for when it was needed but very quick!
Date published: 2023-07-26
Rated 5 out of 5 by from As Advertised Worked as advertised. No issues. seems robust for out testing environment
Date published: 2023-03-20
Rated 3 out of 5 by from 2 units defective out of box The negative terminal was shorted to the body of the sensor and would not work unless the sensor was installed isolated from ground, which we couldn't do in our application. They are easy to disassemble, and the problem was obvious, as one of the wires that connects to the terminal extended about 1/2" past the point that it was soldered at, so the bare wire came into contact with the body of the sensor when it was assembled.
Date published: 2023-01-05
Rated 5 out of 5 by from Very Dependable Unit These units are very dependable. Have bought them on several occasions. Omega also has a good return policy which I had used because I had mistakenly bought the wrong unit. It was very painless to get it sent back and order the correct one.
Date published: 2022-03-22
Rated 5 out of 5 by from Dependable I have bought these in the past and never had any issues. Its why we continue to buy them.
Date published: 2022-03-08
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loading all QA

Can you confirm the resolution of each meter is 0.01% of full scale range or better?

Asked by: JMADV
Thank you for your inquiry. Please email the Flow Group at and can advise.
Answered by: Applications Engineer JJC
Date published: 2024-04-26

Can the FMA-1612A be used in vacuum systems with air? Do you have CAD files (ideally Inventor) of the meter's external dimensions?

Asked by: Ajjj
Thank you for your inquiry! Yes, the FMA-1612A can be used in vacuum systems. Unfortunately, we do not have any 3D models for this device. All available dimensions will be listed in the product manual for this unit.
Answered by: Application Engineer JM
Date published: 2023-02-13

Intended to read air flow, can the display be set up to read in PPM?

Asked by: EEC123
Thank you for your inquiry about the mass flow meter. Unfortunately, it does not have the ability to read in concentration, only volumetric and true mass flow rates.
Answered by: Application Engineer JC
Date published: 2021-05-07

What are the voltage levels of the RS232 signals? -12V to +12V?

Asked by: Dydos
Thank you for your inquiry. The mass flow meters have by factory default a 0 to 5V signal output or as an option a 4 to 20 mA and the RS232 is available as serial communication.
Answered by: Application Engineer JC
Date published: 2022-10-19

Item# FMA-1621A-I2- I would like to purchase this, can you verify how many decimals places the readout will be. I see the range is 0 to 1500SLPM. I need at least one decimal places. How many decimal places are the readings?

Asked by: Tyrone
Thank you for your inquiry about the mass flow mter. The display will have 2 decimal places when measuring the flow rate.
Answered by: Application Engineer JC
Date published: 2022-03-23

Hello, If our desired maximum flow rate is 3000 SLM but pressure is 100 psi (actual LM much lower), is this still the correct instrument to buy? Is the 0.8% accuracy relative to the maximum flow rate or is it a % of the flow rat being read?

Asked by: Nico
Thank you for your inquiry about the mass flow meter. Yes, this series has a flwo meter with a maximum flow capacity of 3000 LPM and the accuracy is percent flow rate reading, not of full scale in other mass flow meters.
Answered by: Application Engineer JC
Date published: 2021-10-19

I have a FMA-1607A-I unit purchased last Feb, 2022. Does it need to be annually calibrated?

Asked by: Thads
Thank you for your inquiry. It is recommended to send flow meters back for an annual re-calibration.
Answered by: Application Engineer JC
Date published: 2023-03-17

I have a problem with an FMA-16018A sensor. I want to use RS232 communication, but I can't find the messages I need to send to receive the measurement data. I can only get it to send me data when it&acute;s in straming mode.

Asked by: JC785
Thank you for your inquiry about the mass flow meter. Please send an email to along with the serial number and advise what information you wish to retrieve via RS232 communication and can provide the information.
Answered by: Application Engineer JC
Date published: 2022-02-23

How much does FMA-1622A weigh?

Asked by: JMADV
Thank you for your inquiry. The weight is 4.5 lbs
Answered by: Application Engineer MC
Date published: 2024-02-11

Hello, does this meter read total mass or volume con the LCD screen?

Asked by: jppt1982
Thank you for your inquiry about this flow meter. You can have the display read in true mass flow, if you need a totalizer, that is an option, ('-TOT'), which will be in total mass.
Answered by: Applications Engineer
Date published: 2021-06-25

What kind of threads does it have? Is it NPT?

Asked by: Alex21
Thank you for your inquiry about the mass flow meter. In the data sheet it will have 10-32 threads up to 50 mL/min and from 100 mL/min to 2000 LPM, it has F NPT
Answered by: Application Engineer JC
Date published: 2023-01-11

Hi, is FMA-1601A usable for LPG with H2S and RSH mixture?

Asked by: Tarek
Thank you for your inquiry about the mass flow meter. There is an option listed in themanual for the '-LSS' version that handles corrosive gases such as the H2S listed. You may submit a request for a quote to with the estmated flow range to prepare the part number required.
Answered by: Application Engineer JC
Date published: 2022-12-03
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