Dwyer Series GFM4 Gas Mass Flow Meter

The Series GFM4 Gas Mass Flow Meter 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. Standard LCD and four button keypad allows easy access to the many features of the GFM4. 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.

Product Applications

  • Gas flow measurement
  • Gas flow control
  • Operating pumps and valves
  • Process equipment
  • Vacuum processes
  • Glass and metal coating
  • Film deposition

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).

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.

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