What is the principle of the area sensor?

Pressure transmitter measured medium of the two pressures into the high and low pressure chamber, the role of the δ element (i.e., sensitive element) on both sides of the isolation diaphragm, through the isolation sheet and the element within the filling liquid transmitted to the measurement diaphragm on both sides. The measuring diaphragm and the electrodes on each side of the insulating sheet form a capacitor.

When the two sides of the pressure is not consistent, resulting in the measurement of the diaphragm displacement, its displacement and pressure difference is proportional to the two sides of the capacitance is not equal, through the oscillation and demodulation link, converted into a signal proportional to the pressure. The working principle of pressure transmitter and absolute pressure transmitter is the same as that of differential pressure transmitter, the difference is that the low pressure chamber pressure is atmospheric pressure or vacuum.