



Dwyer Instruments GFM2 | Gas flow meter
For measuring the flow rates of a wide range of gases, the Series GFM2 Gas Mass Flow Meter is a great option. With two relay outputs, a programmable totalizer that shows the total quantity of gas, and user-selectable 0 to 5 VDC or 4 to 20 mA, the unit can be calibrated for a range of gases.

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- Specifications
- Features
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Accuracy | +/-1% FS |
Connection | Process: 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) |
Leak Integrity | 1 x 10-9 smL/sec of helium |
Manufacturer | Dwyer Instruments |
Material | Wetted: 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. |
Maximum Operating Pressure | 500 psig (34.5 bar) |
Maximum operating temperature | 32 to 122°F (0 to 50°C) |
Maximum Particulate Size | 5 microns |
Output Signal | Linear 0 to 5 VDC (3000 ¢ž¦ min. load impedance) and 4 to 20 mA (500 ¢ž¦ max. loop resistance) |
Power Supply | 11 to 26 VDC |
Relay | Rating: 1 A @ 24 VDC |
Repeatability | +/-0.25% FS |
Response Time | 2 seconds to within +/-2% of actual flow |
Type | Gas Flow Meter |
Weight | 1.05 lb (0.48 kg) |
- Uses a restrictor flow element in conjunction with a straight tube sensor to offer high repeatability of ±0.25% FS and accuracy of ±1% FS.
- An optional 2x16 character LCD panel with internal conversion factors for up to 32 gases can show gas flow in 23 different technical units.
- Simple communication and multi-drop capability of up to 256 units are made possible via digital RS-232 or RS-485 interfaces (RS-485 only).
- Two user-programmable electromechanical SPDT relays with latch options and high and low gas flow alarms can be programmed using an easy-to-use interface.
- Keeps track of internal or user-specific K-factors and calibration data for up to ten distinct gases.
- Adjustment of the sensor zero offset automatically (by means of a local push button or digital interface).
- Includes a traceable NIST certificate.
- Tests for self-diagnosis.
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