Series GFM4 Gas Mass Flow Meter
Pressure, Temperature and Flow Monitoring
No longer available. Please see Series GFM Gas Mass Flow Meter
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
Software
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 |
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| Body Size | 010 050 100 |
Low Flow Medium Flow High Flow |
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| SUPPLY POWER | 2 4 5 |
12 VDC 24 VDC +/- 15 VDC |
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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 | LCD Display | |||||||||
| OUTPUT SIGNAL | A B G |
0-5 VDC 4-20 mA 0-10 VDC |
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| 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 |
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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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