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CAL-V™ Calibration Validation Feature

What is CAL-V™?

Fox has revolutionized the way operators will interface with flow meters by creating the CAL-V™ and Zero CAL-CHECK™ Calibration Validation features. CAL-V™ is an in-situ calibration routine that validates the flow meter’s calibration accuracy by testing the functionality of the sensor and its associated signal processing circuitry. This innovative approach lets you validate instrument calibration in the pipe, at process conditions, with just a push of a button. At the conclusion of the test, the meter will display a pass/fail message and the CAL-V™ data is saved in the meter for look-up at any time. CAL-V™ is available exclusively on the Model FT3.


FT3 with Approvals Stamp

How does CAL-V™ work?

During the test, the meter’s microprocessor adjusts the signal to the sensor elements and determines the resulting electrical characteristics.  These site-determined characteristics are compared with the data that was collected and stored in the instrument electronics during original factory calibration.  Matching data within established tolerances confirms the meter is measuring accurately.

CAL-V™ is an operator-initiated test that can be performed at any flow rate, including zero, and is completed in just three to four minutes. CAL-V™ can be initiated from the front panel, USB connection or RS485 Modbus on the Fox Model FT3. If CAL-V™ is initiated by Fox’s FT3 View™ software, a calibration validation certificate can be produced at the conclusion of the test.

This feature is of particular value in environmental monitoring applications such as flare and vents where periodic calibration validation is mandated. It can also be used to streamline quality assurance, improve process initiatives and apply scheduled maintenance procedures.


Normal Measurement Mode
Cal_V Mode

Compare the competitors’ thermal flow meters with the Fox CAL-V™ Calibration Validation technology. Most competing technologies require various tasks be performed in order for their calibration validation to function. Below is a list of typical requirements of competitive models.

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Calibration Validation

Typical Requirements of Competitive Models

Other Thermal Flow Meters
Fox's FT3 with CAL-V™
Stop the flow  
Not Required
Remove meter from pipe
Disconnect wires from flow meter
Look up data on flow meter’s calibration certificate
Measure electrical characteristics with volt ohm meter
Perform calculations to evaluate flow meter performance
Set process pressure to manufacturer’s calibration pressure
Connect auxiliary test equipment and/or test gases to flow meter
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