Simply put, a pressure transmitter is a kind of “pressure value” converted into pneumatic signal or electric signal to supply secondary instruments such as indication alarms, recorders, and regulators for measurement, indication and process adjustment. Pressure transmitter is the most commonly used transmitter in the field of industrial automation, pressure transmitter involves water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, petrochemical, electric power, ships, machine tools, pipelines and many other industries and fields.
Early pressure transmitters used the principle of large-displacement operation, such as mercury float differential pressure gauges and diaphragm box differential pressure transmitters, which were mass-produced, which were inaccurate and bulky. In the 50s of the 20th century, there was a force balance differential pressure transmitter with slightly higher accuracy, but the feedback force was small, the structure was complex, and the reliability, stability and vibration resistance were poor. In the mid-70s, with the emergence of new processes, new materials, new technologies, especially the rapid development of electronic technology, displacement transmitters with small size and simple structure appeared. In the 90s, science and technology developed rapidly, these pressure transmitters have high measurement accuracy and gradually developed intelligently, and digital signal transmission is more conducive to data acquisition. In the 21st century, digital intelligent transmitters have gradually entered our field of vision, and pressure transmitters adopt advanced detection technology to eliminate the influence of moisture, dust and other harsh on-site environments on transmitter measurement, and achieve greater accuracy.
Pressure transmitters can be divided into capacitive pressure transmitters, diffused silicon piezoresistive pressure transmitters, differential inductive pressure transmitters and other different types.
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