Many people can't tell the difference between pressure sensors, pressure relays pressure switches. Today we will focus on the difference between pressure sensors, pressure relays pressure switches.

　　The pressure sensor is composed of a pressure-sensitive element a conversion circuit. The pressure of the measured medium acts on the pressure-sensitive element to produce a small change in current voltage output. Sensors often need to be used in conjunction with external amplifier circuits to complete the process pressure detection to control display. Because the pressure sensor is a primary element, the signal returned by the pressure sensor needs to be processed, analyzed, stored, controlled by the measurement control system to allow industrial automation equipment engineering operation control. A more intelligent pressure relay uses liquid pressure to open close electrical contacts The signal conversion element of the hydroelectric switch. When the system pressure reaches the set pressure of the relay, an electrical signal is sent to control the action of the electrical components to realize the loading unloading control of the pump, the sequential action of the actuators, the safety protection interlock of the system, etc. It consists of pressure-displacement conversion components micro switch. According to the structure type of pressure-displacement conversion parts, there are four types: plunger type, spring type, diaphragm type bellows type. There are two types of plunger structure: single plunger type double plunger type. The single plunger type can be divided into three types: plunger, differential plunger plunger-lever. According to the contacts, there are single contact double electric shock.

　The pressure switch is a function switch that automatically turns on off when the set value is reached according to the set pressure.

　　Pressure switches pressure relays can only be opened closed at a given pressure for simple position control. They are all digital outputs! Pressure relays can provide more output nodes nodes than pressure switches Types of. The output of the pressure sensor can be an analog signal a digital signal, which is convenient for subsequent processing, can also be converted into a standard transmitter signal for remote transmission.