FCI ST51A, ST75A and ST75AV thermal dispersion mass flow meters

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The ST51A, ST75A and ST75AV thermal dispersion mass flow meters from Fluid Components International (FCI) are designed to provide users with an economical yet rugged solution to measuring air or gases in demanding industrial process and plant applications. They combine surface-mount, lead-free, RoHS compliant electronics with all-welded, equal-mass flow sensors. The added HART digital bus communication and its associated device driver (DD) have been certified by the Fieldcomm Group to meet Version 7 standards.

The ST51A and ST75A were recently independently evaluated by functional safety experts Exida and found to meet SIL 1 compliance with IEC 61508.

The flow meters also offer dual 4–20 mA outputs that meet NAMUR NE43 and feature a 500 Hz pulse. The electronics are housed in an IP67-rated, dual-cable port transmitter enclosure available in aluminium or stainless steel. The transmitter can be mounted directly to the flow sensor or remotely mounted up to 30 m away.

The ST51A is an insertion-style flow meter for use in pipe diameters from 63 to 610 mm and is easily connected into the pipe via a 0.5 or 0.75″ NPT compression fitting. These thermal flow meters measure from 0.08 to 122 MPS with turndown ratio of 100:1 and with accuracy of ±1% reading, ±0.5% FS.

The ST75AV includes built-in Vortab flow conditioning to ensure high accuracy and repeatability in applications which lack enough straight-run. It features a wide 100:1 turndown ratio and measures from 0.01 to 950 NCMH with accuracy of ±1% reading, ±0.5% FS.