Differential Pressure Transmitter Working Principle
1 Differential Pressure Transmitter（DP）
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.