The Difference Between Pressure Gauge, Pressure Sensor and Pressure Transmitter
Pressure gauge refers to an instrument that uses elastic elements as sensitive elements to measure and indicate pressures, which higher than the ambient pressure. It is widely used, and it covers almost all industrial processes and scientific research fields. It can be seen everywhere in the fields of the heating pipe network, oil and gas transmission, water and gas supply system, vehicle repair maintenance factories, and stores. Especially in the process of industrial process control and technical measurement, because the elastic sensitive element of the mechanical pressure gauge has the characteristics of high mechanical strength and convenient production, the mechanical pressure gauge is more and more widely used.
The pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil well, electric power, ships, machine tools, Pipelines, and many other industries.
Traditional pressure sensors are mainly mechanically structured devices, and use the deformation of elastic elements to indicate pressure. However, this structure is large in size and heavy in mass, and cannot provide electrical output. With the development of semiconductor technology, semiconductor pressure sensors have also emerged. Its characteristics are small size, lightweight, high accuracy, and good temperature characteristics. Especially with the development of MEMS technology, semiconductor sensors are developing towards miniaturization, with low power consumption and high reliability.
The pressure transmitter converts the physical pressure parameters of gas, liquid, etc., felt by the load cell sensor into standard electrical signals (such as 4-20mA, etc.) to provide secondary instruments such as indicating alarms, recorders, and regulators for measurement, Instructions, and process adjustment.
The principle is as follows: The mechanical signal of water pressure is converted into an electronic signal such as current (4-20mA). Pressure and voltage or current have a linear relationship, which is generally proportional. Therefore, the voltage or current output by the transmitter increases as the pressure increases, and a relationship between pressure and voltage or current is obtained, and then the pressure is displayed on the computer.