The working principle of differential pressure transmitter is as follows:

Pressure difference measurement:

The differential pressure transmitter receives pressure from the positive and negative pressure ends through its two input pressure interfaces. Measurement can only be carried out when the pressure at the positive pressure end is greater than that at the negative pressure end.

Signal conversion:

The isolation diaphragms on both sides of the sensor directly receive differential pressure from the pressure pipes on both sides, and then transmit it to the measuring element through the sealing liquid inside the diaphragm. The measuring element converts the measured differential pressure signal into its corresponding electrical signal.

Signal amplification and output:

The converted electrical signal will be transmitted to the converter for amplification processing, and the final output will be a standard electrical signal, such as 4-20mA, for subsequent devices or systems to read and analyze

Through the above process, the differential pressure transmitter achieves accurate measurement of the pressure difference between the two sides of the medium, and converts it into an electrical signal that is easy to process and transmit.