Dwyer GFM3 Series Gas Mass Flow Meter and Controllers 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 allow easy access to the many features of the GFM3. The 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 the digital interface for flow to alert users 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. Flow Monitoring, Push-Button Configuration. The unit can be calibrated for a variety of gases via push-button with 0-5 VDC, 0-10 VDC or 4-20 mA and relay outputs.

Dwyer GFM3 Series Features

  • 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 at http://www.dwyer-inst.com.
  • Set alarms remotely via digital interface for flow to alert user of high or low thresholds being exceeded.
  • NIST traceable certificate included.


  • Gas Monitoring
  • Operating Pumps and Valves
  • Process Equipment
  • Vacuum Processes
  • Glass and Metal Coating
  • Film Deposition
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Dwyer GFM3 Series Specification

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 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).

Download Data Sheet: Series GFM3 Gas Mass Flow Meter and Controllers

Ref: dwyer-inst.com