Last Updates: 28/04/2021

Dwyer Series GFM2 Gas Mass Flow Meter

The Dwyer SERIES GFM2 Gas Mass Flow Meter is an ideal choice for the measurement of flow rates of a wide variety of gases. Unit can be calibrated for a variety of gases with user selectable 0 to 5 VDC or 4 to 20 mA and two relay outputs and programmable totalizer that indicates total gas quantity.

Product Applications

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

Service : Clean gases compatible with wetted parts.

Wetted Materials : > GFM2-X-X-A: Anodized aluminum, brass, 316 SS fluoroelastomer O-rings;GFM2-X-X-S: 316 SS, and fluoroelastomer O-rings; Buna-N, EPR and PTFE O-rings optional.

Accuracy : ±1% FS.

Repeatability : ±0.25% FS.

Response Time : 2 seconds to within ±2% of actual flow.

Output Signal : Linear 0 to 5 VDC (3000 Ω min. load impedance) and 4 to 20 mA (500 Ω max. loop resistance).

Relay Rating : 1 A @ 24 VDC.

Max. Particulate Size : 5 microns.

Temperature Limits : 32 to 122°F (0 to 50°C).

Power Supply : 11 to 26 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.

Display : 2 x 16 character LCD (optional).

Pressure Limits : 500 psig (34.5 bar).

Leak Integrity : 1 x 10-9 smL/sec of helium.

Weight : 1.05 lb (0.48 kg).

  • Utilizes a straight tube sensor with a restrictor flow element to provide a high ±1% FS accuracy and ±0.25% FS repeatability
  • Gas flow can be displayed in 23 different engineering units on an optional 2×16 character LCD display with internal conversion factors for up to 32 gases
  • Digital RS-232 or RS-485 interfaces allow for easy communication and for multi-drop capability of up to 256 units (RS-485 only)
  • User-friendly interface allows for the programming of high and low gas flow alarms, along with two user-programmable electromechanical SPDT relays with latch options
  • Stores calibration information for up to 10 different gases, internal or user-specific K-factors
  • Automatic sensor zero offset adjustment (via digital interface or local push button)
  • NIST traceable certificate included
  • Self-diagnostic tests

Manuals: IOM Manual

Catalog Pages: Series GFM2 Catalog Page

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