The difference between mechanical pressure switches and electronic pressure switches

There are two main types of pressure switches: mechanical and electronic. There are various types of mechanical pressure switches, as well as electronic ones. Let's talk about the difference between mechanical pressure switches and new and old electronic pressure switches.

The working principle of a mechanical pressure switch is that when the measured pressure exceeds the rated value, the free end of the elastic element undergoes displacement, which directly or after comparison pushes the switch element to change its on/off state, achieving the purpose of controlling the measured pressure. Generally, an "electric contact pressure gauge" is used, which is a common tube spring pressure gauge with two sets of electric contacts. It can connect electrical contacts with high and low pressure to control the pressure between the upper and lower limits. This type of electrical contact has a small capacity and can only switch the control coil of the contactor. The control position on the pressure switch can be adjusted. The characteristics of this mechanical pressure switch are: cheap price, easy to use, but low accuracy, short service life, and inconvenient control point setting.

The working principle of an electronic pressure switch is to use a pointer pressure sensor to measure the pressure of the medium, and then convert the measured pressure into a digital signal and send it to the programmable logic device PLC to control its upper and lower pressure limits. When the pressure reaches the preset pressure, the output voltage drives the motor or other controllable devices. This pressure switch has many disadvantages, such as low accuracy and poor observability due to the use of pointer pressure sensors; The entire pressure switch is expensive and cumbersome to operate.

The electronic pressure switch with new technology is designed and produced using high-precision pressure sensors and temperature compensation technology, combined with microprocessor technology and advanced analog-to-digital converters. This pressure switch is equipped with a precision pressure sensor, which amplifies the pressure signal through a high-precision instrument amplifier. The data is collected and processed through a high-speed MCU, and real-time digital pressure display is achieved through LCD or LED. Relay signal output is used, and the upper and lower limit control points can be freely set, ensuring stability, reliability, and high precision. The disadvantage is the price *.

Mechanical pressure switches and electronic pressure switches each have their own advantages, and they jointly promote the development of pressure measurement. Zhongxuan Instrument suggests that users choose according to their own situation and needs.