The Zero CAL-CHECK™ feature is used to ensure that the flow meter still retains its original NIST-traceable calibration at zero flow.
IN SITU Zero CAL-CHECK™
If zero flow can be established, the sensor does not need to be removed and the procedure can be done in the pipe. If zero flow cannot be established, a Fox Packing Gland Assembly is used to remove the sensor from the gas stream to simulate a “no flow” condition.
The test compares sensor characteristics at zero flow with customer-set zero flow baseline and takes less than five minutes to complete after zero flow condition has been established.
OUT OF PIPE Zero CAL-CHECK™
If zero flow cannot be established and the meter must be removed from the pipe, this test may be used. The test will compare the sensor characteristics at zero flow at ambient temperature and atmospheric pressure with the factory characteristics. This test can also be performed in less than five minutes once the set up is complete.