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Zero CAL-CHECK™ Calibration Validation Feature

Zero CAL-CHECK™ is a Calibration Validation test feature available on Fox Models FT1 and FT3 Thermal Mass Flow Meter & Temperature Transmitter. The Zero CAL-CHECK™ test does the following:

  • Checks for build-up on sensor that could affect calibration
  • Further validates the zero stability of the meter
  • Checks thermal conductivity (heat transfer) repeatability of the sensor

Zero CAL-CHECK&trade must be performed at zero flow to ensure a valid test result. 

Zero CAL-CHECK™ Configurations


If space allows, redirect the flow through a bypass pipe section in order to isolate the sensor of the meter in the position where it has been installed. While the flow is redirected, the Zero CAL-CHECK™ test can be performed. Once the test is complete, the valves to the bypass may be closed and flow may be directed back to the meter’s sensor where flow monitoring can continue as normal.

If space limitations prevent insitu testing at zero flow as listed to the left, then out of pipe testing must be performed.

With this configuration, the meter must be removed from the process, the test performed, and then the meter returned to the process after testing has been completed.

Due to the high sensitivity of both the DDC-Sensor™ and the PowerPro™ sensor, it is necessary to isolate the sensor once the meter has been removed from the pipe. Therefore, Fox provides a sensor cover when the meter is shipped to the customer. An alternative to the sensor cover is to use a clean, dry bottle or other closed container in order to isolate the sensor and achieve the “no flow” condition necessary to perform the Zero CAL-CHECK™ test.

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