Dwyer Series GFM4 Gas Mass Flow Meter and Controller

Dwyer GFM4 Series Gas Mass Flow Meter and Controller

Dwyer GFM4 Series Gas Mass Flow Meter and Controller is an ideal choice for the measurement of flow rates of a wide variety of gases. This multi-parameter flow meter supports various functions such as flow totalizer, flow, temperature, and pressure alarms, and is available in a choice of 0 to 5VDC, 0 to 10VDC, or 4 to 20 mA output signals. Dwyer Controller with Standard LCD and four-button keypad allows easy access to the many features of the GFM4.

Dwyer Mass Flow Meter with 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, pressure, and temperature to alert user of high or low thresholds being exceeded.

With a high ±1% FS accuracy and ±0.25% FS repeatability, the GFM4 is the optimal choice in gas flow metering and monitoring. The GFM4 comes with a NIST traceable certificate. Pressure, temperature and flow monitoring.

Dwyer GFM4 Series Features

  • Multi-drop capability of up to 256 units (for RS-485 option).
  • Programmable 12 digit totalizer indicates total gas volume.
  • Flow alarm limits for high and low gas flow with relay output.
  • Pressure alarm limits for high and low gas pressure with relay output.
  • 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 at http://www.dwyer-inst.com.
  • NIST traceable certificate included.


  • Gas flow measurement
  • Gas flow control
  • Operating pumps and valves
  • Process equipment
  • Vacuum processes
  • Glass and metal coating
  • Film deposition
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Dwyer GFM4 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 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: 200 psia (13.79 barA).
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 GFM4 Gas Mass Flow Meter and Controller

Ref: dwyer-inst.com