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Fluid Components International (FCI) has developed the ST75 Flow Meter, designed to deliver precise direct mass-flow measurement of gases.

The ST75 Flow Meter is suitable for the measurement of CO2 in a variety of industrial applications.

It is a rugged instrument, designed for demanding process-industry plant environments for line sizes from 0.25 to 2.0in (6 to 51mm).

The ST75 provides three outputs: the mass-flow rate, totalised flow and media temperature.

With accuracy to +/-1 per cent of reading and +/-0.5 per cent repeatability, the ST75 Flow Meter’s design includes media temperature compensation to ensure performance under variable process and plant temperature conditions.

Its precision flow element has a no-moving-parts design that employs platinum RTD sensors embedded in equal mass thermowells with microprocessor electronics that can be calibrated to laboratory standards for CO2 and a range of other gases.

It operates over a flow range from 0.01 to 559 SCFM (0.01 to 950 NCMH) depending on line size, making it equally suited to low- and high-flow applications.

For variable process conditions, the ST75 is factory preset to a turndown range of 10:1 to 100:1.

Developed with FCI’s thermal-dispersion technology, the meter eliminates the need for temperature sensors, flow computers, or other devices that are required with orifice plates, Venturis, Vortex shedding and other meters.

There are no orifices or inlets to clog or foul, which reduces scheduled maintenance and unplanned shut-downs.

The ST75’s standard outputs are fully scaleable at 4-20mA and 0-10V.

They are user assignable to flow rate and/or temperature and a 0-1kHz pulse output of total flow.

The instrument can be ordered for input power with 18 to 36V DC or 85 to 265V AC, with or without a built-in LCD digital display.

Manufactured with a rugged sensing element using all welded 316 stainless-steel construction and Hastelloy-C tips, the ST75 is enclosed in a rugged, all-metal, dust- and water-resistant Nema Type 4X (IP66)-rated package designed for hazardous area installations.

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