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Principle of input static pressure liquid level transmitter

The input static pressure liquid level transmitter is based on the principle that the measured liquid static pressure is directly proportional to the liquid height, and uses the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert the static pressure into an electrical signal. After temperature compensation and linear correction, it is converted into 4-20madc standard current signal output. The sensor part of the input static pressure liquid level transmitter can be directly put into the liquid, and the transmitter part can be fixed with flange or bracket, which is very convenient for installation and use.
P= ρ gh
Principle of static pressure measurement: when the liquid level transmitter is put into a certain depth of the measured liquid, the pressure on the liquid level of the sensor is as follows:
P= ρ gH+Po
P: Pressure on liquid level of transmitter
ρ: Measured liquid density
g: Local gravitational acceleration

Po: atmospheric pressure above the liquid level
H: Depth of liquid into the transmitter
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air guide stainless steel, and then the atmospheric pressure Po on the liquid level is connected with the negative pressure chamber of the sensor to eliminate the Po on the back of the sensor, so that the pressure measured by the sensor is: ρ g.H 。 Obviously, the liquid level depth can be obtained by measuring the pressure P.
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