According to the principle of static pressure measurement, when the liquid level transmitter is put into a certain depth of the measured liquid, the pressure formula on the liquid level of the sensor is as follows: _=p.g.H+Po:
P: Pressure on the liquid level of the transmitter
P: measured liquid density
G: Local gravity acceleration
Po: atmospheric pressure on liquid surface
H: Depth of the transducer into the liquid
At the same time, the pressure of liquid is introduced into the positive pressure chamber of the sensor through the gas-conducting stainless steel, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor to counteract the Po on the back of the sensor.
The pressure measured by the sensor is p.g.H. Obviously, the liquid level depth can be obtained by measuring the pressure P.