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ST75 Series Flow Meter

Models ST75 and ST75A have a standard “T” fitting design that 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, Models ST75 V and ST75 AV provide the solution. FCI’s ST75 V and ST75 AV include 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 ST75 V and ST75 AV.

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 models can be ordered for DC (18 V to 36 V) or AC (85 V to 265 V) power.

ST75 provides the most comprehensive selection of outputs in its class. Dual analog outputs, a pulse output and a digital, serial I/O are standard on all models. Models ST75 A and ST75 AV include HART. Dual 4-20 mA analog outputs are field assignable to flow rate and/or temperature. These outputs are user scalable to the instrument’s full calibrated range or any subset. Flow rate is selectable for reading in mass flow or standard volumetric engineering units. A 0-500 Hz pulse output of flow is provided for interface to totalizers

A two-way HART bus over the #1 4-20 mA output is provided with Models ST75 A and ST75 AV. The HART bus complies with revision level 7 protocol, is fully compatible with all versions of HART field communicators and control systems, and has been certified by the FieldComm organization. In all models a standard RS232C serial I/O link is provided for instrument configuration, service/troubleshooting data, and measured readings.

For more information, please download the ST75 Series Brochure