What is the zero point migration when measuring the differential pressure level gauge?

What is the zero point migration problem when measuring the differential pressure level gauge? The differential pressure liquid level gauge is a device that uses the pressure generated by the liquid column to measure the liquid level height. After the water level changes, the pressure difference measured by the differential pressure transmitter will also change, and there is a linear relationship between them. relation. When using the differential pressure transmitter to measure the liquid level, due to the different installation positions of the differential pressure transmitter, the positive and negative pressure guide pipes are filled with liquid, which will make the differential pressure transmitter have a fixed differential pressure. When the liquid level is zero, the differential pressure gauge indicates that it is not at zero, but indicates a positive or negative indication deviation. In order to indicate correctness and eliminate this fixed deviation, move the zero point down or up, that is, carry out 'zero point migration'. This differential pressure value is called the migration amount. If this value is positive, the system is called positive migration; if it is negative, the system is negative migration; if this value is zero, it is no migration.
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