Fluid Components International ST75 Air/Gas Flow Meter

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The ST75 Air/Gas Flow Meter from Fluid Components International (FCI) measures natural gas, carbon dioxide (CO₂) and mixed waste gases in small line sizes to optimise brewing fermentation processes, product quality and overall plant efficiency.

Today’s modern breweries not only produce a good product, but they also focus on reducing their carbon footprint by tightly controlling natural gas usage, residual CO₂ levels and mixed waste gases. From fermentation vessel steam heating to product kegging or bottling to CO₂ recovery for co-gen power or combined heat and power (CHP) systems to flaring, the emphasis is on product quality and protecting the environment.

FCI’s ST75 Series Flow Meter helps breweries optimise complex fermentation tank steam heating processes by measuring the ratio of boiler burner fuel gas to air for efficient combustion. The CO₂ gas that is naturally produced during the brewing process and any additional CO₂ gas necessary for finishing the beer require accurate measurement within tight tolerances. Thermal flow meters such as the ST75 Flow Meter with its thermal dispersion technology are suitable for small line sizes from 6 to 51 mm.

The flow meter is equally well suited for low flow and higher flow operations in industrial applications and operates over a wide flow range, from 0.01 to 950 NCMH depending on line size. For variable process conditions, the ST75 is factory preset to a wide turndown range at 10:1 to 100:1.

With built-in temperature compensation, the flow meter features accuracy to ±2% of reading with ±0.5% repeatability over varying process temperatures in line sizes from 6 to 51 mm. With a Vortab Flow Conditioner added as a spool piece, the Models ST75V or ST75AV are suitable for installations with limited straight-run and/or for operating in transitional flow ranges with accuracy of ±1% reading, ±0.5% full scale.

The ST75’s fully scalable dual 4–20 mA standard outputs are user assignable to flow rate and/or temperature and a 0–1 kHz 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 FM and CSA approved ST75 Flow Meter is enclosed in a rugged, all-metal, dust- and water-resistant NEMA Type 4X (IP66) rated package designed for Class 1, Div 1 hazardous area installations and includes a rugged sensing element constructed with all welded 316 stainless steel and Hastelloy-C tips. ATEX/IEC approvals include: Zone 1, II 2 G Ex d IIC T6 . . . T3; II 2 D Ex tD A21, IP67 T90º . . . T300º.