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Dwyer Series GFM3

Series GFM3 Gas Mass Flow Meter

Flow Monitoring, Push-Button Configuration

Dwyer Series GFM3
Series GFM3

The Dwyer Series GFM3 Gas Mass Flow Meter is an ideal choice for the measurement of flow rates of a wide variety of gases. This digital flow meter features a 12-digit totalizer for total gas volume indication, and is available in the choice of 0 to 5 VDC, 0 to 10 VDC, or 4 to 20 mA output signals. Standard LCD and four button keypad allows easy access to the many features of the GFM3. Digital interface operates through available RS-485 or RS-232, providing access to internal data parameters and multi-drop capability of up to 255 units (RS-485 only). Set alarms remotely via digital interface for flow to alert user of high or low thresholds being exceeded. With a high ±1% FS accuracy and ±0.25% FS repeatability, the GFM3 is the optimal choice in gas flow metering and monitoring. The GFM3 comes with a NIST traceable certificate.


Dwyer Series GFM3 Specifications

  • Service:Clean gases compatible with wetted parts.
  • Wetted Materials:316 SS, 416 SS; Fluoroelastomer, Buna-N, EPR or PTFE O-rings.
  • Accuracy:±1% FS.
  • Repeatability:±0.25% FS.
  • Response Time:0.6 to 1.0 s to within ±2% of setpoint over 20 to 100% FS.
  • Output Signal:Linear 0 to 5 VDC (3000 Ω min. load impedance); 0 to 10 VDC (6000 Ω min. load impedance); 4 to 20 mA (500 Ω max. loop resistance).
  • Relay Rating:1 amp @ 24 VDC.
  • Max. Particulate Size:5 microns.
  • Temperature Limits:Ambient: 32 to 122°F (0 to 50°C); Dry Gases: 14 to 122°F (-10 to 50°C).
  • Power Supply:12 VDC; 15 VDC; ±24 VDC.
  • Process Connections:1/8″ compression fitting for flow rates ≤ 10 L/min; 1/4″ for ≤ 50 L/min; 3/8″ for ≤ 100 L/min.
  • Pressure Limits:500 psia (35 bar).
  • Leak Integrity:1 x 10-9 smL/sec of helium.
  • Display:128 x 64 graphic LCD with backlight.
  • Weight:1 lb (.45 kg).



  • Multi-drop capability of up to 256 units (for RS-485 option).
  • Programmable 12 digit totalizer indicates total gas volume.
  • Four button keypad and large 128×64 graphical LCD with backlight.
  • Internal conversion factors for up to 32 gases.
  • Automatic zero adjustment.
  • Self diagnostic tests.
  • Free communication software available for download.



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