Air pressure sensor switch with mechanical and electronic type two kinds big, mechanical pressure switch and a variety of, are a variety of electronic. Below we said the old pressure sensor switch, and the difference between old and new pressure sensor switch.
　　Old pressure sensor switch working principle is: when the measured pressure exceeds rating, the displacement of the free end of the elastic element, directly or after comparison switch element, change the on-off state switching element, achieve the goal of measured pressure control. General is the use of "electric contact pressure gauge," this is a common tube spring pressure gauge, with two sets of electric contact. Can I plug in the quite high and low pressure electric contact, so as to control the pressure between the upper and lower limits. The electric contact capacity is small, can only switch contactor coil, the control of pressure gauge on the control position can be adjusted. This pressure sensor switch features are: cheap, simple to use, but the precision is low, service life is short, point setting more troublesome and setting is not convenient, no power supply.
　　There is kind of old electronic pressure sensor switch, its working principle is: pointer pressure sensor is used to measure the medium pressure, and then to be measured pressure is converted to a digital signal to the PLC programmable logic devices pressure control of the upper and lower limits, when the pressure to set output voltage drive motor or other control device. This pressure sensor switch with more drawbacks, due to the use of pointer type pressure sensor, the accuracy is not high, significant sex differences; The whole high pressure switch cost, can handling complicated.
　　The latest technology of pressure sensor switch, USES the advanced high precision pressure sensor and temperature compensation technology, combined with the world's leading micro processing technology and advanced design and production of adc. This pressure switch is built-in precision pressure sensor, through high precision instrumentation amplifier amplification pressure signal, through high-speed MCU data acquisition and processing, using LCD or LED digital display real-time pressure, relay output signal, upper and lower control points can be set freely, small hysteresis, shock resistant, fast response, stable and reliable, high precision, using the return difference set can effectively protect the pressure fluctuations caused by repeated action, protect control equipment, is testing pressure, liquid level signal, pressure, liquid level monitoring and control of high precision equipment.
　　Pressure switch development, with the development of sensors and the application of the pressure switch as pressure sensors, they jointly push forward the pressure measurement.