The working principle of an electric contact pressure gauge is based on the deformation of the elastic element and the opening and closing of the circuit between the contacts. When fluid pressure acts on a spring tube, the spring tube will deform, and the degree of deformation is proportional to the fluid pressure. The transmission system transmits the deformation of the spring tube to the contacts through components such as connecting rods and gears, thereby opening or closing the circuit between the contacts, and ultimately converting mechanical signals into electrical signals. Specifically, the electric contact pressure gauge undergoes elastic deformation under the pressure of the measured medium through the spring tube in the measurement system. This deformation is amplified through a rod and gear transmission mechanism, and the measured value is indicated on the dial. At the same time, when the deformation reaches the set upper or lower limit, the contact comes into contact with the contact on the set pointer, causing the circuit in the control system to disconnect or connect, thereby achieving the purpose of automatic control and sending alarm signals. In addition, electric contact pressure gauges are widely used in industrial sectors such as petroleum, chemical, metallurgy, power stations, and machinery. They are usually used in conjunction with electrical components such as relays and frequency converters to achieve automatic control and alarm of fluid media. This type of instrument can accurately record and measure pressure values, and is widely used in situations where precise pressure control is required.