GFM 173 by Aalborg Instruments
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The Aalborg Instruments GFM 173 is a thermal mass flow meter designed for accurate gas measurement, featuring pressure and temperature compensation. It operates with a medium temperature range of 0°C to +50°C and supports a maximum operating pressure of 69 bar overpressure. The unit requires a power supply of 12 to 26 VDC at 200 mA and provides linear output signals of 4-20 mA and 0-5 VDC corresponding to the selected measuring range. Constructed with an aluminum sensor measuring body, the meter includes wetted parts made of aluminum, brass, 316 SS stainless steel, and Viton O-rings. Process connections are made via two 1/4" compression fittings for approximately 6.3 mm tubing. The measuring range spans from 0-10 ml/min to 0-10 l/min, referenced to nitrogen at 20°C and 1 bar absolute, with a turndown ratio of 1:100 and a response time of 2 seconds.
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Characteristics
| Manufacturer | Aalborg Instruments |
|---|---|
| Country | |
| Part number | GFM 173 |
| Inner Code | 3339272 |
Technical specification
| Product type | Thermal Mass Flow Meter |
|---|---|
| Sensor measuring body | Aluminum |
| Medium temperature range | 0°C to +50°C |
| Max operating pressure | 69 bar overpressure |
| Power supply | 12 - 26 VDC (200 mA) |
| Turndown ratio | 1:100 |
| Standard conditions (N) | 20°C and 1 bar abs. |
| Accuracy | +/- 1% of full scale at 15°C to 25°C and 0.35 bar to 4.1 bar abs., otherwise +/- 3% of full scale |
| Reproducibility | +/- 0.25% of full scale |
| Response time | 2 seconds at 25% to 100% |
| Wetted parts | Aluminum, brass, stainless steel (316 SS) and Viton O-rings |
| Process connection | 2 x 1/4" compression fitting (approx. 6.3 mm tube) |
| Measuring ranges | 0 - 10 ml/min to 0 - 10 l/min (referred to nitrogen at 20°C & 1 bar abs.) |
| Output signal | 4..20 mA and 0..5 VDC linear |
| Medium | N2 gas |