Space-saving Flow Meter Measures Process Gas or Air Flows

The ST75V air/gas flow meter from Fluid Components International combines reliable, no-moving parts thermal mass flow sensing technology with built-in precision Vortab flow conditioning to achieve +1% rdg, +0.5% fs accuracy, in line sizes from 0.25 to 2.0 inches (6 to 51 millimeters).

Many applications, either space limitations or other devices, such as valves or elbows, make it impossible to install a flow meter with the required upstream/downstream straight-pipe run. This results in swirl and flow profile disturbances that invalidate the flow meter's accuracy. The ST75V reportedly solves this problem with built-in flow conditioning that eliminates media disturbances while reducing the needed pipe straight-run by up to 70%.

The ST75V's integral Vortab flow conditioner features engineered array of tabs that provide rapid cross-stream mixing to remove swirl and velocity problems, creating a smooth, fully developed flow profile for accurate measurement. There is also virtually no pressure loss with Vortab technology, which reduces plant energy costs by optimizing throughput.

Blending high accuracy with extensive features, the ST75V measures process gas or air flows from 0.01 SCFM (0.01 NCMH) to 559 SCFM (950 NCMH). Ideal for both low-flow and high-flow applications, the ST75V provides three unique outputs of the mass flow rate, totalized flow and media temperature.

The ST75V was developed to be the highest-accuracy, lowest cost, small-line thermal mass flow solution for processes that flow hazardous fuel gases such as hydrogen, natural gas, methane, as well as air, oxygen, nitrogen and all inert gases. It is said to be ideal for use in fuel and air feed lines to furnaces, burners, industrial ovens, heat treating systems, boilers and power co-generation equipment found in the manufacturing and process industries.

The ST75V's sensor design is all-welded stainless steel with Hastelloy-C tips that provide extra protection against invasive conditions within the pipe. This design also features no orifices or moving parts to clog or foul, which eliminates unplanned shutdowns, reduces maintenance and extends sensor life. The transmitter is enclosed in a rugged, all-metal, dust and water resistant, NEMA Type 4X (IP67) rated package, which is FM and ATEX agency approved for installations in hazardous locations.

The ST75V's standard outputs are fully scaleable 4-20mA and 0-10V 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 powering by 24 V D.C. or 115/230 V A.C., with or without a built-in LCD digital display, and in local or remote-mounted electronics configurations.

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