Dwyer GFM4 Series Gas Mass Flow Meter and Controller
Dwyer GFM4 Series Gas Mass Flow Meter and Controller

Dwyer GFM4 Series Gas Mass Flow Meter and Controller

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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 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
Another Article:

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

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