Pressure sensor refers to the diaphragm device (stainless steel membrane, etc.) as a medium, with pressure-sensitive elements of gas and liquid pressure measurement, and converted into electrical signal output equipment. Usually consists of a pressure sensitive element and a signal processing unit. According to different types of test pressure, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

According to the actual situation of the current flowmeter products, according to the structural principle of the flowmeter, can be roughly summarized into the following types:

Pressure sensors are one of the most commonly used sensors in industrial practice, instrumentation control, and are widely used in a variety of industrial self-control environments involving construction machinery, trucks, water conservancy and hydropower, railroad transportation, production automation, aerospace, military, petrochemicals, oil wells, electric power, ships, machine tools, pipelines and many other industries. Mechanical sensors of various types, such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors and capacitive acceleration sensors. However, the most widely used is the piezoresistive pressure sensor, which has a very low price and high accuracy as well as good linearity characteristics.

As we all know, the main channel for human beings to obtain external information is the sense organs, in which the eyes, ears, nose, mouth and limbs play the role of the front end. However, with the development of science and technology and scientific progress, in the new state of production and life, human senses can not meet the demand. In this case, the birth and application of sensors show great value.