Home > Versatile thermal mass flow meter now available from AMS Instrumentation and Calibration

Versatile thermal mass flow meter now available from AMS Instrumentation and Calibration

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article image ST75 thermal mass flow meters
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Fluid Components International (FCI) introduce ST75 thermal mass flow meters, available from AMS Instrumentation and Calibration , that deliver precise direct mass flow measurement of gases in an easy to install insertion style instrument.

Requiring minimal maintenance over a long life, ST75 mass flow meters are ideal for the measurement of CO2 in a variety of industrial applications.  CO2 is commonly used in the bottling of beverages that include soda drinks, beer and sparkling wine.  It is also commonly recovered from hydrogen and ammonia production plants as well as natural gas wells, and is also used to enhance production from older oil wells. 

FCI’s ST75 mass flow meters are rugged and reliable and designed for demanding process industry plant environments.  With an extensive set of standard features, the ST75 flow meters have been designed for line sizes from 6 to 51mm. The mass flow meters provide three unique outputs:  the mass flow rate, totalized flow and media temperature.

The design of the ST75 flow meters includes media temperature compensation to ensure performance under variable process and plant temperature conditions with accuracy to ±1% of reading and ±0.5% repeatability.  Its precision flow element has a no-moving parts design that employs platinum RTD sensors embedded in equal mass thermowells with microprocessor electronics that can be calibrated to laboratory standards for CO2 as well as many other gases.

The ST75 Flow Meter operates over a wide flow range, from 0.01 to 950 NCMH depending on line size, making it well suited for low and high flow applications.  For variable process conditions, the ST75 is factory preset to a wide turndown range at 10:1 to 100:1.  

The ST75 provides direct-flow measurement for more accurate 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. There are no orifices or inlets to clog or foul, significantly reducing scheduled maintenance and unplanned shut-downs. 

The standard outputs of the ST75 flow meters are fully scaleable 4-20mA and 0-10V and they 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 either 18 to 36 Vdc or 85 to 265 Vac, with or without a built-in LCD digital display.  

The flow meters are manufactured with a rugged sensing element using an all welded 316 stainless steel construction and Hastelloy-C tips. The ST75 is enclosed in a rugged, all-metal, dust and water resistant NEMA Type 4X (IP66) rated package designed for hazardous area installations.  Approvals include: Class 1, Div. I Groups B, C, D. Div. II Groups A-D; ATEX/IECEx Zone I, II 2 G Ex d IIC T6...T3; II 2 D Ex td A21, IP67 T90°...T300° (pending); FM/CSA/CRN and CE Marked. 

For CO2 measurement and monitoring, the ST75 provides an accurate, fast response and low-maintenance solution for carbon dioxide applications.

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