When to Consider Range Migration

When using our UPB5 differential pressure transmitter to measure the liquid level in industrial production, if the positive and negative pressure chambers of the differential pressure transmitter and the pressure point of the container are on the same level, no migration is required.

In practical applications, due to the consideration of the installation location of the equipment and the ease of maintenance, the measuring instrument may not always be on the same level as the pressure point; if the measured medium is a highly corrosive or heavy viscosity liquid, The medium cannot be directly introduced into the pressure measuring instrument, an isolation liquid tank must be installed, and the isolation liquid is used to transmit the pressure signal to prevent the measured instrument from being corroded.

At this time, it is necessary to consider the influence of the liquid column of the medium and the isolation liquid on the reading of the pressure measuring instrument. In order to correctly indicate the height of the liquid level, the differential pressure transmitter must do some technical processing—that is, migration. 

Migration can be divided into no migration, negative migration and positive migration.

For more details, please contact Stella Meng.