Air/Gas flow meter

The ST100 thermal flow meter from Fluid Components International (FCI), features a wide choice of communication options with 4-20 mA analog, frequency/pulse, alarm relays and fully-approved digital communications: HART, Foundation Fieldbus, Modbus and Profibus. The flow meter combines flow sensing performance with a feature- andf unction-rich electronics. The thermal mass gas flow meter features a plug-in card replacement that can be changed out by technicians in the field to adapt to a plant’s changing network communication needs.

Featuring a graphical, multivariable, backlit LCD display continuously shows all process measurements and alarm status, and it has the ability to query for service diagnostics.

The meter measures gas mass flow rate, total flow, temperature and pressure depending on model family. It can store up to five unique calibration groups to accommodate broad flow ranges, differing mixtures of the same gas and multiple gases, and obtains up to 1000:1 turndown.  An optional, patent-pending SpectraCal Gas Equivalency calibration method lets users select and switch between 10 common gases. Also standard is an on-board data logger with an easily accessible, removable 2-GB micro-SD memory card capable of storing 21 million readings.

The STP family measures mass flow, temperature and pressure, while the ST family measures mass flow and temperature. Both families include single-point and dual-element models as configurations outfitted with the in-situ calibration option, VeriCal.

ST100 meters are available with three different types of flow sensors to best match user applications: FPC-style, FP-style and S-style.  The fast-response FPC-style features an integral, patent pending flow conditioner and protective shroud optimized for compressed air and clean gas applications. The FP-style is a fast response, general purpose design with a protective shroud and is also the sensor used with FCI’s VeriCal in-situ calibration option. The unshrouded S-style facilitates easy cleaning and provides a smoothed response for applicationswith wet or dirty gases or erratic flows.          

The devices can be calibrated to measure virtually any process gas, including wet, mixed and dirty gases. The basic insertion style air/gas meter features a thermal flow sensing element that measures flow from 0.07 to 305 NMPS with accuracy of  ±0.75 percent of reading, ±0.5 percent of full scale.  

Offering service up to 454ºC, the rugged flow meter is designed for rugged industrial process and plant applications.  Both integral and remote (up to 300 meters) electronics versions are available. The device is agency approved for hazardous environments, including the entire instrument, the transmitter and the enclosure.  Instrument approvals (submitted and pending) include: FM and FMc: Class 1, Division 1, hazardous locations, Groups B, C, D, E, F, G; ATEX and IECEx:  Zone 1, II 2 GD Ex d IIC T4; The rugged enclosure is NEMA 4X/IP67 rated.