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FCI obtains SIL compliance for compact thermal mass flowmeters

FCI's ST51A flowmeter excels in biogas applications
FCI's ST51A flowmeter excels in biogas applications

Fluid Components International (FCI) has released the new advanced, SIL IEC 61508 compliant ST51A and ST75A thermal mass flowmeters as a solution for air/gas flow measurement. 

For engineers designing safety instrumented systems, these models provide compact, low-cost thermal flow metering solutions carrying a SIL rating.

They were independently evaluated by world leading functional safety experts, Exida, and found to meet SIL 1 compliance.       

The Model ST51A flowmeter is an insertion-style instrument designed for use in pipe diameters larger than 2” (51 mm).

It is optimised for flow measurement of air, compressed air, nitrogen, natural gas, digester gas, and all other biogases.

The ST75A flowmeter is an inline-style instrument designed for use in pipe diameters from 0.25” to 2” (6-51 mm) in air, all inert gases, natural gas and other hydrocarbon gases applications. 

Both models feature wide 100:1 turndown, have no moving parts, carry global agency approvals for Div.1/Zone 1 Ex installations, high IP67 dust/water ingress protection, and rugged, all metal enclosures.

For interface and communications, the meters include dual 4-20mA which meets NAMUR 43, HART Version 7 as certified by the FieldComm Group (HART), and a 500Hz pulse.

Optionally available is two-line LCD readout to display flow rate and either temperature or totalised flow. 

The transmitter/electronics can be integrally mounted with the flow element or remote mounted up to 100ft (30m) away.

The transmitter enclosure is available in either painted aluminium or stainless steel, and can be ordered with either NPT or metric threaded cable ports.

Both the ST51A and ST75A meters are temperature compensated and calibrated to the user’s actual installation conditions in one of FCI’s 19 flow stands using NIST and ISO/IEC 17025 traceable equipment.

For applications with limited straight-run, the ST51A and ST75A can be supplied with and calibrated specifically for use with Vortab flow conditioners. 

FCI's ST51A flowmeter excels in biogas applications