This thermal mass flowmeter has ATEX/IECEx approvals
ATEX and the IECEx approvals assure that the ST80 Series thermal mass flowmeter (photo) has been independently certified for safe installation in potentially explosive conditions found in processes and in hazardous-gas flowmetering applications. The independent third-party testing and certified ratings of the ST80 cover the complete instrument, including the sensor element, electronics and the enclosure. The ST80 Series meters are suitable for pipe diameters from 1 to 99 in. (25 to 2,500 mm) and air/gas temperatures up to 850°F (454°C). They have an accuracy of±1% of reading,±0.5% of full scale and repeatability of±0.5% of reading with flowrates up to 1,000 std. ft3/s (305 Nm3/s) and 100:1 turndown. The ST80 Series uses the company’s patent-pending Adaptive Sensing Technology (AST) thermal mass-flow-measuring technique, which include a hybrid sensor drive plus measuring circuit that combines both proven thermal dispersion techniques of constant power (CP) and constant temperature (CT) in the same instrument. The ST80 with AST measures in CT mode when measuring in lower flow ranges and start-up conditions, and will transparently and seamlessly shift to CP mode at mid-range and higher flowrates. — Fluid Components International (FCI), San Marcos, Calif.