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Variable Area In-line Liquid Flow Meters

Variable Area In-line Liquid Flowmeters


Article# FLMW-1205BR

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Variable Area In-line Liquid Flowmeters FLMW-1205BR FLMW-1205BR
  • Direct Reading Dual Scale
  • Range 0.1 to 150 GPM (0.4 to 550 LPM)
  • High Pressure: 3500 psi (Brass or Aluminum) 6000 psi (Stainless Steel)
  • High Temperature: to 116°C (240°F) (Standard) or 204°C or 316°C (400 or 600°F) (Optional)

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Media Type
Liquid Flow Range
Process Connection Size
Wetted Materials
Max Operating Pressure
Process Connection Type
Max Process Temperature
Valve Included

The FLMW and FLMH variable area flowmeters can be installed directly in the fluid line without flow straighteners or special piping. The spring-and-piston type assembly enables these flowmeters to be mounted in any position and protects them against changes in viscosity. Available scaled for water or oil, in Aluminum, Brass or Stainless Steel bodies.

The FLMW or the FMLH Series with the optional analog output (-MA) are typically used to transmit a signal proportional to the flow rate to a process controller, a PLC, a recorder, or a panel-mount display. With the -MA options the user can choose between reading a 0 to 2000 Hz square-wave pulse, a 0 to 5 Vdc analog signal, or a 2-wire 4 to 20 mA analog signal by connecting the appropriate pins.

Accuracy: ±2% FS over the entire scale range
Repeatability: ±1%
Flow Measuring Range: 0.4 - 560 lpm (0.1 - 150 gpm)
Maximum Operating Pressure:
   Aluminum and brass monitors: 3500 psig (240 Bar)
   Stainless steel monitors: 6000 psig (410 Bar) up to 116°C (240°F)
Maximum Operating Temperature:
   Standard Models: 116°C (240°F)
   High Temp (-HT) Models: 204°C (400°F) max
   Ultra High Temp (-UHT) Models: 316°C (600°F) max
Pressure Differential: download spec sheet for pressure drop graphs
Standard Calibration Fluids:
   Oil monitors: DTE 25 @ 43°C (110°F), 0.873 sg
   Water monitors: tap water @ 21°C (70°F), 1.0 sg
Maximum Particle Size: 76 microns
Relay (Optional): 1 or 2 form “C” relays, rated 10 A @ 125 or 250 Vac or 0.25 A @ 250 Vdc
Mechanical Life: >107 cycles
Analog Output (Optional): Supply voltage 12 to 35 Vdc, field selectable for 0 to 5 Vdc (100 W minimum load), 0 to 2000 Hz square-wave pulse or 4 to 20 mA; Rmax = 50 (Vs-12). Vs = supply voltage DC
Installation Dimensions:
   1/4 and 1/2 NPT Sizes: 1-7/8 OD x 6.6" length
   3/4 and 1 NPT Sizes: 2-3/8 OD x 7.2" length
   1-1/4 and 1-1/2 NPT Sizes: 3-1/2 OD x 10.1" length

Materials of Construction (Wetted Parts)
Description Aluminum
(Not for Water)
Brass Stainless Steel
High pressure casing, end ports and tapered shaft Aluminum Brass 304 SS
Seals Buna (std), EPR, FKM or perfluoroelastomer Buna (std), EPR, FKM or perfluoroelastomer FKM with PTFE backup (std) Buna, EPR or perfluoroelastomer
Transfer Magnet PTFE-coated Alnico PTFE-coated Alnico PTFE-coated Alnico
Floating Orifice Disk Stainless Steel Stainless Steel Stainless Steel
All Other Internal Parts Stainless Steel Stainless Steel Stainless Steel

Materials of Construction (Non-Wetted Components)
Description Aluminum Brass Stainless Steel
Window Tube Polycarbonate (std), Pyrex® Polycarbonate (std), Pyrex® Polycarbonate (std), Pyrex®
Window Seals Buna (std) Buna (std) Buna (std)

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Rated 4 out of 5 by from Valve continuos purging system monitoring Common medium for this application is high pressure hot oil (160C) that is required in a very small flow capacity (10÷20lit/h per one valve).
Date published: 2018-04-23
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I am interested in FLMH-1010SS-MA for measuring oil flowrate. I am looking at the pressure drop curves shown in the datasheet. Could you provide info on what oil these curves are based on, and how they would scale for an oil that is ~30 cSt at ~40 C.

Asked by: Suchi
Thank you for your inquiry. The pressure drop curves for the FLMH series meters used DTE 25 at 110F (43 C), 0.873 SG oil. Please e-mail for questions about your specific application.
Answered by: AS Engineer
Date published: 2020-01-31

We are replacing some flow switches with Omega Model FLMW-1002-SS at one of our plants. How much do they weigh, and is this value documented anywhere in your literature? I'm a piping engineer, and I need to address any differences in weight.

Asked by: Alan Swizz
Thank you for your inquiry. Please contact the Flow Group at and will advise on the estimated ship weight for the inline flow meter.
Answered by: Applications Engineer JJC
Date published: 2024-02-23
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