Differential pressure transmitter issues
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There is a differential pressure transmitter on site. After installing a HART375 transmitter, it was found that the zero point was incorrect. After performing zero-point calibration, the differential pressure was brought to zero, but the output current still showed 21mA. What is the problem? Thank you
HART display: PV 0.00KPA, PV 0%, AO1 21mA
It’s possible to calibrate the zero point and range; it seems that the current output is incorrect. You can also increase the pressure to see how the current changes and whether it remains linear: lol
Set the issue and correctly configure the parameters again.
If an anomaly is detected, try restoring to factory settings
Adjust the pressure and see if there is a change in the output, and whether it remains linear. In such cases, it’s usually because the handheld controller accidentally set some parameters, resulting in an inverted output. This is just my opinion; I hope the original poster finds it useful. As for the differential pressure, if you don’t want to deal with it, simply restore the device to its factory settings
It seems that the hand controller isn’t set up properly. If there is a zeroing button on the meter, you can try using it on the meter. If it’s still 21mA, then there might be a problem with the gauge.
Check the range of the transmitter? Is it -0 kPa? It’s not possible to restore to factory settings.
Are you doing zeroing at the factory or zero-point migration?