Pressure transmitters are one of the most commonly used sensors in industrial production. They are widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production process control, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, and pipelines. Below is a brief introduction to the principles and applications of some commonly used pressure transmitters. Pressure transmitters are used to measure the level, density, and pressure of liquids, gases, or steam, and then convert the pressure signal into a standard current or voltage output signal.

    Pressure transmitters mainly include ceramic piezoresistive pressure transmitters, capacitive pressure transmitters, diffused silicon pressure transmitters, strain gauge pressure transmitters, sapphire pressure transmitters, sputtered thin-film pressure transmitters, etc. According to the pressure measurement range, pressure transmitters can be divided into three types: general pressure transmitters (0.001 MPa ~ 100 MPa), micro differential pressure transmitters (0 ~ 1.5 kPa), and negative pressure transmitters. The main function of a pressure transmitter is to transmit the pressure signal to electronic equipment and then display the pressure through a computer. Its principle is roughly as follows: it converts the mechanical signal of pressure, such as hydraulic or pneumatic pressure, into an electronic signal such as current or voltage. The pressure and the voltage or current are linearly related, generally in a proportional relationship. Therefore, the voltage or current output by the transmitter increases as the pressure increases. From this, a relationship between pressure and voltage or current is obtained, thereby achieving the purpose of measuring the pressure of a liquid or gas.