Fluid Components International ST75 air/gas flow meter for dosing applications

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Designed for gas dosing and injecting applications, the ST75 air/gas flow meter from Fluid Components International (FCI) features a solid-state thermal dispersion mass flow sensing element with platinum RTDs. It measures virtually any gas or gas mixture, and can be calibrated to measure gases over a flow range from 0.07 to 950 NCMH, depending on line size, which is useful in low-flow applications requiring small doses.

For variable demand cycles due to small batch or other continuous process production requirements, the ST75 flow meter is factory preset to 100:1 turndown. It features a high accuracy to ±1% of reading with ±0.5% repeatability in line sizes from 6 to 51 mm.

The ST75 flow meters are designed with a choice of mounting configurations. They feature a full digital display and are also available with optional transmitter remote mounting up to 30 m away.

Where crowded equipment layouts exist and compromise straight pipe runs, the ST75AV meter features a built-in Vortab flow conditioner.

The ST75 flow meter’s fully scalable, dual 4–20 mA standard outputs are user assignable to flow rate or temperature and a 0–1 kHz pulse output of total flow. Two-way HART bus communications are available, and the instrument can be ordered for input power with either 18–36 VDC or 85–265 VAC.

The flow meters withstand process temperatures from -18 to 121°C and operate at pressures up to 16.5 bar (g) with a standard t-fitting (NPT female) process connection. With a tube process connection, the meter withstands 41 bar (g).