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Differential Pressure Transmitter Working Principle

Oct 09, 2017

Differential Pressure Transmitter Working Principle


1 Differential Pressure Transmitter(DP)

Pressure trainsmitter working principle.png

Differential pressure transmitter includes two functional units:

Main unit

Auxiliary unit


Main unit includes sensor and process connection, working principle as followed:

The sensor module uses whole welded technology, in which has a compact overload diaphragm, 

a differential pressure sensor and a temperature sensor. The temperature is taken as a reference

for temperature compensation.

The positive end of the differential pressure sensor is connected with high pressure chamber of 

sensor capsule; the negative end is connected with low pressure chamber of sensor capsule. 

Through the isolated diaphragm and filling liquid, the differential pressure is transmitted to silicon 

die in the inner of differential pressure sensor, which makes the resistor of sensor die change. 

So the detection system outputs different voltage. The output voltage is in proportion to the 

pressure variation, and then it is transmitted to standard output by adapter and amplifier.