Flow Monitoring, Push-Button Configuration

The Series GFM3 Gas Mass Flow Meter is an ideal choice for the measurement of flow rates of a wide variety of gases. This digital flow meter features a 12-digit totalizer for total gas volume indication, and is available in the choice of 0 to 5 VDC, 0 to 10 VDC, or 4 to 20 mA output signals. Standard LCD and four button keypad allows easy access to the many features of the GFM3. 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 to alert user of high or low thresholds being exceeded. With a high ±1% FS accuracy and ±0.25% FS repeatability, the GFM3 is the optimal choice in gas flow metering and monitoring. The GFM3 comes with a NIST traceable certificate.

Product Applications

Gas Monitoring
Operating Pumps and Valves
Process Equipment
Vacuum Processes
Glass and Metal Coating
Film Deposition

More Information

Model Chart

EXAMPLE	GFM3	AIR	010	2	B	A	L	A	A	2	Series GFM3-AIR-010-2-B-A-L-A-A-2, Gas Mass Flow Meter
SERIES	GFM3										GFM3 Gas Mass Flow Meter
SPECIALTY GAS K FACTOR AND DESIRED GAS		AIR AR C2H2 C3H8 C4H10 CH4 CO CO2 HE HF H2 N2 NH3 O2 SO2									1.0000 Air 1.4573 Argon 0.5839 Acetylene 0.3500 Propane 0.2631 Butane 0.7175 Methane 1.0000 Carbon Monoxide 0.7382 Carbon Dioxide 1.4540 Helium 0.9998 Hydrogen Fluoride 1.0106 Hydrogen 1.0000 Nitrogen 0.7310 Ammonia 0.9926 Oxygen 0.6900 Sulfur Dioxide
BODY SIZE			010 050 100								Low Flow Medium Flow High Flow
SUPPLY POWER				2 4 5							12 VDC 24 VDC +/- 15 VDC
SEAL MATERIAL					B E T V						Buna-N EPR PTFE Fluoroelastomer
FITTINGS						A B D					1/4” Compression (low) 1/8” Compression (medium) 3/8” Compression (high)
DISPLAY							L				LCD Display
OUTPUT SIGNAL								A B G			0-5 VDC 4-20 mA 0-10 VDC
DIGITAL INTERFACE										2 5 9	RS232 RS485 Profibus

Specifications

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: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 &#8804 10 L/min; 1/4" for &#8804 50 L/min; 3/8" for &#8804 100 L/min.
Pressure Limits:500 psia (35 bar).
Leak Integrity:1 x 10-9 smL/sec of helium.
Display:128 x 64 graphic LCD with backlight.
Weight:1 lb (.45 kg).

Features

Multi-drop capability of up to 256 units (for RS-485 option).

• Programmable 12 digit totalizer indicates total gas volume.

• Four button keypad and large 128x64 graphical LCD with backlight.

• Internal conversion factors for up to 32 gases.

• Automatic zero adjustment.

• Self diagnostic tests.

• Free communication software available for download at www.dwyer-inst.com.

• Set alarms remotely via digital interface for flow to alert user of high or low thresholds being exceeded.

• NIST traceable certificate included.

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