What is a ‘zero check’ and ‘static zero check’ on a DP flow transmitter?

Instrumentation Flow
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Zero Check: A procedure for checking the transmitter output is equal to 4.00 mA when its HP & LP chambers are equalized and are at the atmospheric pressure.

Static zero check: A procedure for checking the transmitter output is equal to 4.00 mA when its HP & LP chambers are equalized and are at the operating pressure.

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