FCI ST75 Air/Gas Flow Meter

The ST75 Air/Gas Flow Meter, which measures fuel gas, process gas, inert gas, waste gases and air in small line sizes, is suitable for optimising the fuel-to-air ratio for plant burner-boiler control. The natural gas and air flow measurement provided by the meter allows engineers to monitor and control the precise amount of fuel and air needed to fire burners most efficiently.

The product is designed for small line sizes ranging from 6 to 51 mm. It provides the mass flow rate, totalised flow and media temperature. It is suitable for applications in a wide range of industries including chemical, electric power, food/beverage, advanced materials, pharmaceuticals, semiconductor and more.

The meter maintains consistent performance in rugged environments and features accuracy to ±2% of reading with ±0.5% repeatability over varying process temperatures. Its precision flow element has a no-moving-parts design that employs platinum RTD sensors embedded in equal mass thermowells with microprocessor electronics calibrated to laboratory standards for a range of gases. The product is equally suited for low- and high-flow operations and operates over a flow range from 0.01 to 950 NCMH depending on line size. For variable process conditions, the product is factory preset to a wide turndown range at 10:1 to 100:1.

The meter’s remote mounting capabilities ensure an accurate and low-maintenance measurement solution in hard-to-reach locations. It is suitable for hazardous factory areas and crowded plants where explosive, flammable or toxic gases may be present near transmitting electronics. The remote mount transmitter, which includes a full digital display, can be mounted up to 15 m away from its thermal mass flow sensor in the process piping and connected via two 0.50″ FNPT or M conduit connections.

The 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 flow meter is enclosed in a rugged, all-metal, dust- and water-resistant NEMA Type 4X (IP66)-rated package and includes a rugged sensing element constructed with all welded 316 stainless steel and Hastelloy-C tips.