ST75 is an accurate, no moving parts, direct mass flow measurement and monitoring solution for fuel gases, air, compressed air, inert and other gas flows within industrial processes. There are two base models in the series — Model ST75, and Model ST75V which include built-in Vortab flow conditioners. They are available in six different sizes for direct, in-line installation in line sizes from 1/4 inch to 2 inch [6 mm to 51 mm]. By combining precision lithography structured platinum

RTD sensors embedded in FCI’s equal mass thermowells with microprocessor electronics and precise actual gas calibration, the ST75 achieves outstanding flow measurement performance.

Using FCI’s proven thermal dispersion technology, the ST75’sdirect mass flow measurement eliminates the cost and space of additional sensors required by inferred technologies. With its

100:1 turndown and flow ranges from 0.01 SCFM to 559 SCFM[0.01 NCMH to 950 NCMH], the ST75 measures over a wide flowrange, from low to high flow conditions. The ST75 is available in

specific calibrations for most gases including natural gas, methane and other hydrocarbon gases, as well as nitrogen, CO2, argon and all inert gases, compressed air and more.

Easy to Install, Easy to Use Model ST75 standard “T” fitting design allows for fast, simple in-line installation. Standard NPT line size selections include 1/4 inch, 1/2 inch, 3/4 inch, 1 inch, 1 1/2 inch and 2 inch. For compression fitting tube applications, selections include 1/4 inch, 1/2 inch and 1 inch. For installations with inadequate straight-run or obstructed flows that prevent a fully developed profile for accurate flow measurement with the standard ST75, Model ST75V provides the solution. FCI’s Model ST75V includes all of the features and functionality of the ST75 plus built-in Vortab flow conditioning. Vortab flow conditioners are the flow conditioning technology

proven and recommended by flow measurement experts to eliminate both swirl and velocity profile distortions to ensure accurate flow measurement. Vortab flow conditioners also are the lowest pressure loss solution of all flow conditioning techniques. FCI is the exclusive provider of Vortab flow conditioners for use with thermal mass flow meters such as the ST75V. To serve a variety of application and installation requirements the ST75 and ST75V are available in three standard configurations as shown at left. (Other display options are described in Accessory

Remote Digital Display section.) To provide convenient and easy access for wire-up and signal

isolation, the instrument’s enclosure features dual conduit ports in either NPT or M20 threads, as well as removable front and rear covers. ST75 can be ordered for DC (18 V to 36 V) or AC (85 V to 265 V) power.