Calibration Feature Checks for Build-Up on Flow Meter Sensor

Fox Thermal Instruments has added a Zero Cal-Check calibration validation feature to the Fox Model FT3 thermal mass flow meter and temperature transmitter. Zero Cal-Check checks for build-up on the sensor that could affect calibration, further validates the zero stability of the meter and checks thermal conductivity (heat transfer) repeatability of the sensor.

Unlike Cal-V, which may be performed in the pipe and at process conditions, Zero Cal-Check must be performed at zero flow to ensure a valid test result.  Depending upon the configuration -- insitu or out of pipe -- zero flow will either be compared to a customer-established field baseline or a factory baseline.

Like Cal-V if Zero Cal-Check is initiated by using the free FT3 View software, a calibration validation certificate can be produced at the conclusion of the test.  A passing Cal-V in-situ sensor and electronics test, combined with a passing Zero Cal-Check test, provides complete validation of flow meter calibration accuracy, including confirmation that the sensing elements are clean. This feature is of particular value in environmental monitoring applications such as flare and vents where periodic calibration validation is mandated.