The working principle of pressure detection equipment mainly relies on the following mechanisms:

Capacitive Pressure Sensor: This sensor utilizes a capacitor as the sensitive element, with a circular metal film or metal-coated film acting as one electrode of the capacitor. When the film deforms under pressure, the capacitance between the film and the fixed electrode changes, converting the pressure into a change in the capacitance value, which is then output as an electrical signal related to voltage.

Piezoelectric or piezoresistive effects: Certain materials generate an electric potential (piezoelectric effect) or change in resistance (piezoresistive effect) when subjected to pressure. By utilizing these effects, pressure sensors can measure the magnitude and changes in pressure.

Sensor and Measurement Circuit: The pressure monitoring device consists of a sensor section and a measurement circuit. The capacitance of the capacitor varies with pressure, which is then converted into a current or voltage output signal by the measurement circuit for display and control.

These principles demonstrate how various types of pressure detection devices sense and convert pressure changes through physical or electronic means, thereby enabling the measurement of pressure.