The two kinds of pressure of the tested medium are in high and low two pressure chambers, which are acting on the two sides of the delta element (i.e., the sensitive element), which are transmitted to both sides of the measuring diaphragm through the spacer and the filling liquid in the element. The capacitance pressure transmitter is composed of a measuring diaphragm and an electrode on both sides of the insulating sheet. When both sides of the pressure is not consistent, resulting in the measurement of the diaphragm displacement, the displacement and pressure difference is proportional to the two sides of the capacitance range, through the oscillation and demodulation process, and the pressure is converted into a signal. The working principle of the capacitive pressure transmitter and the capacitive absolute pressure transmitter is the same as that of the differential pressure transmitter, which is different from the pressure chamber pressure of the pressure chamber. The A/D converter of the capacitive pressure transmitter converts the current of the demodulator into a digital signal, and the value is used by the microprocessor to determine the input pressure value. Microprocessor control transmitter. In addition, it makes sensor linearization. Reset measurement range. Engineering unit conversion, damping, prescribing, fine-tuning operations, sensors, and diagnostic and digital communication.