Dwyer GFM3 Series Gas Mass Flow Meter and Controllers

Dwyer GFM3 Series Gas Mass Flow Meter and Controllers

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
Another Article:

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

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