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The ST98L in-line mass flowmeter from Fluid Components (FCI) offers a reliable flow measurement solution for almost any air or gas mixture in small process line sizes from 1in to 2in (25mm to 50mm).

With the ST98L in-line flowmeter, FCI combines precision thermal dispersion mass flow sensing and advanced electronics with exacting fluid calibration and a choice of rugged, industrial enclosures.

The result is air/gas measurement at an economical instrument low lifecycle cost, which is highly repeatable over a long service life with virtually no maintenance, according to FCI.

The ST98L comes in two different flow element styles that are application specific.

The F-style element is for applications in dry, clean air/gases with fluid temperatures up to 350F (177C).

The F-style design incorporates FCI’s equal mass sensor in smaller diameter thermowells for faster response time and improved repeatability in processes with dynamic temperature swings.

The S-style flow element is suitable for demanding applications involving dirty or erosive fluids, high moisture content gas or a pulsating flow.

The S-style element features more robust, thicker wall thermowells and an unshrouded equal mass sensor element that provides a noise-filtered response, extended erosion resistance and allows for easier cleaning.

In wastewater treatment, digesters or landfill gas recovery with wet compressed air or gas with erosive particulates, the S sensor element is said to provide good accuracy.

With a reliable thermal mass sensing element, the advanced ST98L in-line mass flowmeter is claimed to deliver precision gas flow rate and totalised flow and temperature measurement.

It features accuracy to +/-1 per cent of reading, 0.5 per cent of full scale.

The ST98L offers repeatability to +/-0.5 per cent of reading and is temperature compensated for accurate measurement under variable environments.

It operates over a flow range from 0.0062 to 1,850SCFM (0.01 to 3,140Nm3/h).

It features a turndown ratio that is factory preset from 10:1 up to 100:1 within the calibrated flow range and operates at pressures up to 250psig (17 bar G).

The ST98L’s thermal mass sensing element is comprised of two all-welded 316L stainless-steel thermowells that protect two matched platinum precision resistance temperature detectors (RTDs).

With a no-moving parts design, one RTD is heated relative to the reference RTD and the temperature difference between the two is proportional to the gas mass flow rate.

The ST98L’s transmitter features microprocessor-based electronics.

The transmitter can be specified as integral with the sensor or remote mounted up to 1,000ft (350m) away.

Enclosures are available in multiple configurations, with ratings for hazardous environments that include Nema Type 4X (IP66), Division 1 Groups B, C, D, E, F, G.

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