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The advanced ST75 Flow Meter from Fluid Components is now Atex and IECEx approved for safety in hazardous and potentially explosive plant environments.

The IEC prepares and publishes international standards for electrical, electronic and related technologies, while the Atex directive specifies design criteria for flow meters and other electrically powered instruments, to help prevent explosions and fires when combustible gases are present.

Atex and IECEx approval for potentially explosive environments means that the ST75 Flow Meter is suitable for applications in hazardous plant areas in the European Community and elsewhere worldwide.

Designed for line sizes from 0.25 to 2.0in (6 to 51mm), the ST75 Flow Meter provides three outputs: the mass flow rate, totalised flow and media temperature.

It is suitable for applications in a range of industries, including chemical, electric power, food/beverage, advanced materials, pharmaceuticals and semiconductors.

The ST75 includes media temperature compensation to ensure performance in rugged environments and features accuracy to +/-2 per cent of reading with +/-0.5 per cent repeatability.

Its precision flow element has a no-moving-parts design that employs platinum RTD sensors embedded in equal-mass thermowells, with microprocessor electronics calibrated to laboratory standards for a range of gases, including: natural gas, methane, nitrogen CO2, argon, all inert gases and compressed air.

The ST75 Flow Meter is equally suited for low- and high-flow operations.

It operates over a 0.01 to 559 SCFM (0.01 to 950 NCMH) flow range, depending on line size.

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

The ST75 is remote mountable, suitable for equipment-crowded plants or hazardous factory areas where explosive, flammable or toxic gases may be present near the transmitter’s electronics.

The remote-mount transmitter, which includes a full digital display, can be mounted up to 50ft (15m) away from its thermal mass-flow sensor in the process piping and connected via two 0.50in FNPT cables.

The ST75 provides an accurate, fast-response and low-maintenance solution to small-line-size gas- and air-flow applications in hard-to-reach or hazardous locations.

It features fully scalable 4-20mA and 0-10V standard outputs that 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.

The ST75 features thermal dispersion technology, providing direct-flow measurement for higher performance at a lower cost by eliminating the need for temperature sensors, flow computers or other devices that are required with orifice plates, Venturis, Vortex shedding and other meters.

Its no-moving-parts design ensures a long service life and, as there are no orifices or inlets to clog or foul, scheduled maintenance and unplanned shut-downs are reduced.

The ST75 includes a rugged sensing element constructed with all-welded 316 stainless-steel and Hastelloy-C tips.

It 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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