ST100 Series of thermal mass air/gas flow meters

The ST100 Series of thermal mass air/gas flow meters comprises two core model families: ST meters measure both mass flow and temperature, with the STP family also measuring pressure. The meters can be calibrated to measure most process gases, including wet gas, mixed gases and dirty gases.

The basic insertion-style air/gas meter has a thermal flow element that measures flow from 0.07 to 305 nmps with an accuracy of ±0.75% of reading, ±0.5% of full scale.

Designed for rugged industrial processes and plants, the meters include service up to 454°C and are available with both integral and remote 300 m electronics versions. They are agency-approved for hazardous environments, including the entire instrument, the transmitter and the rugged, NEMA 4X/IP67-rated closure.

The meters are available with 4-20 mA analog, frequency/pulse, alarm relays and additional digital bus communications including Fieldbus, Profibus and Modbus. They are adaptable with a plug-in card replacement that can be changed out by plant technicians in the field.

The meters store up to five calibration groups to accommodate broad flow ranges, differing mixtures of the same gas and multiple gases and obtain up to 1000:1 turndown.

The ST100 Series has obtained full certification from the HART Foundation for its hardware and DD files.

The ST100 offers three different types of flow sensor: the fast-response FPC-style is suitable for compressed air and clean gas applications; the fast-response, general-purpose, FP style is the sensor used with FCI’s VeriCal in-situ calibration option; and the unshrouded S-style is suitable for wet or dirty gases, or erratic flows.