FCI MT91 flue duct flowmeter

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Flue or stack gases pose special challenges for single-point air/gas flow measurement sensing technologies because of their multigas composition, swirling air currents, high temperature, humidity extremes and sticky or abrasive particulates.

The MT91 flowmeter from FCI meets US environmental requirements for CEMS per CFR Title 40, Part 75. The MT91 is suitable for measuring mass flow almost anywhere variable conditions limit single-point flowmeter effectiveness.

The MT91 features a multipoint averaging thermal mass flow sensor design. The design combines FCI’s thermal dispersion flow element design with up to 16 flow sensing points while operating over a wide temperature range up to 454°C.

The MT91 flowmeter features a wide turndown range available from 5:1 to 100:1 with a flow range from 0.08 to 46 NMPS. Up to four meters can be installed to measure air/gas in the largest of stacks. Measurement repeatability is ±0.5% of reading.

All wetted surfaces are 316 stainless steel with nickel brazed joints per AMS 4777 (standard) or Hastelloy C-276 as an option. Coating materials, such as electroless nickel plating or chromium carbide, are also available.

The 316L stainless steel sensor assembly is available with flanged, threaded and retractable process connections with an IP66-rated (NEMA/CSA Type 4X) junction box. The flow element assembly is connected remotely by cable to the electronics package up to 304 m away. Dual 4-20 mA analog outputs of flow rate and temperature and dual DPDT relays are available for interfacing with DCS, PLC, SCADA, controllers or other recording devices.