How pressure transmitters work?

- Mar 14, 2018 -

The pressure transmitter, which transmits the pressure signal to the electronic device, displays the pressure through the computer. Its general working principle is to convert the pressure signal of water pressure into an electronic signal (4-20 mA). The linear relationship between pressure and voltage or current size is generally proportional. Therefore, the voltage or current output from the transmitter increases with pressure.


Two pressures of the measured medium of the pressure transmitter pass into the high pressure chamber and the low pressure chamber. The pressure of the low pressure chamber is atmospheric pressure or vacuum, and it acts on the isolating diaphragms on both sides of the δ element (ie, the sensitive element), passes through the spacer and The filling liquid in the element is sent to both sides of the measuring diaphragm. The pressure transmitter consists of a capacitor formed by the measuring diaphragm and the electrodes on both sides of the insulating sheet. When the pressures on both sides are inconsistent, the measuring diaphragm is displaced, and the displacement is proportional to the pressure difference. Therefore, the capacity on both sides is not equal, and the signal is proportional to the pressure through the oscillation and demodulation steps. Transmission effect.


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