Series GFM4 Gas Mass Flow Meter

Pressure, Temperature and Flow Monitoring

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No longer available. Please see Series GFM Gas Mass Flow Meter

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Grouped product items
Model	Description	Availability*	Qty	Price

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:: 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).

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 128x64 graphical LCD with backlight
Internal conversion factors for up to 32 gases
Automatic zero adjustment
Self diagnostic tests
Free communication software available at dwyer-inst.com
NIST traceable certificate included

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series GFM4 Catalog Page

Drawings

Software

Download Software - FREE!

Model Chart

EXAMPLE	GFM4	AIR	010	2	B	A	L	A	A	2	Series GFM4-AIR-010-2-B-A-L-A-A-2, Gas Mass Flow Meter
SERIES	GFM4										GFM4 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
TEMPERATURE & PRESSURE OUTPUT SIGNAL									A B C D E F G H I J		NA/NA 0-5 VDC/0-5 VDC 0-5 VDC/4-20 mA 0-5 VDC/0-10 VDC 4-20 mA/0-5 VDC 4-20 mA/4-20 mA 4-20 mA/0-10 VDC 0-10 VDC/0-5 VDC 0-10 VDC/4-20 mA 0-10 VDC/0-10 VDC
DIGITAL INTERFACE										2 5 9	RS232 RS485 Profibus

FAQ

Questions

Question

What is the difference between a Gas Mass Flow Meter to a Gas Mass Flow Controller?

Answer

The major difference between the GFM and the GFC is the that GFM is just used to measure the flow going through the meter. The GFC has the added feature of a electromagnetic valve to control the flow to a desired set rate. Our newer GFM flowmeters (GFM2, GFM3, and GFM4) have some added features to the base GFM unit, such as optional relays, push button configuration, and pressure and temperature monitoring, respectively.

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