FCI ST51 thermal mass flow meter for mining gas measurement

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The ST51 mass flow meter from Fluid Components International has a non-clogging thermal dispersion mass flow sensing element design that operates over a wide flow range with low-flow sensitivity. This rugged design is suitable for wet, dirty coal mines and coal bed methane gas recovery environments.

The ST51 features an insertion-style flow element with flow accuracy to ±1% of reading over a broad flow range from 0.08 to 122 m/s, and repeatability of ±0.5% of reading. It is suitable for line sizes from 51 to 610 mm diameters.

The ST51 operates over a wide turndown range of 100:1, which is essential due to the variable gas flows in mining operations. It operates at temperatures from -18 to 121°C and withstands pressures up to 34 bar (g), 0.08 to 122 m/s, and repeatability of ±0.5% of reading.

The flow element is constructed with a 316L stainless steel body and Hastelloy C-22 thermowell sensors to resist corrosion. It is approved for use in hazardous environments with a wide range of approvals.

Dual 4-20 mA analog outputs are user assignable to flow rate or temperature, and there is a 0-1 kHz pulse output for totalised flow. The transmitter’s digital communications include an RS-232C port, and there is the option of a wireless IR link for PDA use.

The ST51’s transmitter is also available in a remote mount configuration that can be mounted up to 15 m away from the flow element.The transmitters are housed in an aluminium enclosure that is NEMA 4X approved and meets IP67 requirements.