Series GFM2 Gas Mass Flow Meter
Series GFM2 Gas Mass Flow Meter - ±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
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
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 |
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| BODY SIZE | 010 050 100 |
Low Flow Medium Flow High Flow |
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| BODY MATERIAL | A S |
Aluminum Stainless Steel |
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| SEAL MATERIAL | B E T V |
Buna-N EPR PTFE Fluoroelastomer |
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| FITTINGS | A B D |
1/4” Compression (low) 1/8” Compression (medium) 3/8” Compression (high) |
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| DISPLAY | L N |
LCD Display No Display |
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| OUTPUT SIGNAL | A B |
0-5 VDC 4-20 mA |
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| DIGITAL INTERFACE | 2 5 9 |
RS232 RS485 Profibus |
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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