Series GFM2 Gas Mass Flow Meter

Gas Mass Flow Meter
±1% FS, Programmable Relays

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±1% FS, Programmable Relays

The 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

More Information

Model Chart

EXAMPLE	GFM2	AIR	010	A	B	A	L	A	2	Series GFM2-AIR-010-A-B-A-L-A-2, Gas Mass Flow Meter
SERIES	GFM2									GFM2 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
BODY MATERIAL				A S						Aluminum Stainless Steel
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 N			LCD Display No Display
OUTPUT SIGNAL								A B		0-5 VDC 4-20 mA
DIGITAL INTERFACE									2 5 9	RS232 RS485 Profibus

Specifications

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).

Features

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 2x16 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

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