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Low Pressure Drop Gas Mass Flow Meters



Item# FMA-LP1603A

In stock

Lead Time (If not in stock): 3 weeks
  • Ranges of 0 to 0.5 SCCM Up to 0 to 500 SLM
  • Reports Mass Flow, Volumetric Flow, Temperature, and Pressure
  • < 10 ms Response Time—Field Adjustable
  • 130+ Gas Calibrations, Including Air, Ar, CH4, CO, CO2, Ethane, H2, He, N2, N2O, Neon, O2, Propane, Butane, Iso-Butane, Acetylene, Ethylene, Krypton, Xenon, and Sulfur Hexafluoride

FMA-LP1603A Model Options

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

The FMA-LP1600A Series mass and volumetric flowmeters use the principle of differential pressure within a laminar flow field to determine the mass flow rate. A laminar flow element (LFE) inside 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. A differential pressure sensor is used to measure the pressure drop along a fixed distance of the LFE. This, along with the viscosity of the gas, is used to accurately determine the volumetric 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 keypad or via RS232 communications. Volumetric flow, mass flow, absolute pressure, and temperature can all 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 38 m (125'). These flowmeters can be portable with an optional battery pack (-B models).

Mass Reference Conditions: (STP) 25ۥC, 14.7 PSIA
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 via RS232 communications.
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 (Maximum): 50 psig
Measurable Flow Rate: 125% FS
Supply Voltage: 7 to 30 Vdc (15 to 30 Vdc for 4 to 20 mA output)
Supply Current: 40 mA typical current draw; 100 mA available supply recommended
Cable Connection: 8-pin mini DIN
Wetted Parts: 302 and 303 SS, FKM, silicone RTV, nylon 616, aluminum
Ingress Protection: IP40
-LSS (Option):316LSS, 303SS, 430FRSS, Perfluoroelastomer standard, FKM, EPDM, Buna, Neoprene
Communications: RS232 standard, RS485 (optional)

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Rated 5 out of 5 by from Air flow rate Works great and is very stable. I am reading 5 cc/min rate and it is rock solid at 2 decimal places.
Date published: 2024-07-16
Rated 3 out of 5 by from Procurement Agent We procured this Flowmeters for our Aerospace industry from our existing supplier - Omega who supports our requirements with timely updates against the orders
Date published: 2024-06-03
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Are any of your MFM rated for hazardous environments Class 1 Div 1

Asked by: Chris1227
Thank you for your inquiry about the mass flow meter. Unfortunately, Omega's MFM or MFC are not rated for hazardous applications.
Answered by: Application Engineer JC
Date published: 2022-01-24

Hi, We have ordered some FMA-LP1606A-B sensors. Do the battery-powered units have different sizes comparing to the normal ones? Thank you.

Asked by: stevekla
Thank you for your inquiry about the mass flow meter. The dimensions for the portal battery style have slight changes in height and depth in that respect.
Answered by: Application Engineer JC
Date published: 2022-09-15

Hi, I have ordered FMA-LP1615A. Will it come with an RS232 communications cable? Can the RS232 communications cable directly connect to computer and record real-time data?

Asked by: Shiji2
Thank you for your inquiry. Unless you have a converter module to connect the lead wires from the cable included to a USB connector. There is a cable, FMA1600-C4, that is sold separetely that will have a USB connector to connect into your PC.
Answered by: Applications Engineer JJC
Date published: 2023-12-01
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