The pressure sensor is composed of a pressure-sensitive element and a conversion circuit. The pressure of the measured medium acts on the pressure-sensitive element to produce a small change in current or voltage output. Sensors often need to be used in conjunction with external amplifier circuits to complete the process from pressure detection to control and display. Because the pressure sensor is a primary element, the signal fed back by the pressure sensor needs to be processed, analyzed, stored, and controlled by the measurement and control system, so that industrial automation equipment and engineering operation control are more intelligent.
The pressure relay is a fluid-electric switch signal conversion element that uses liquid pressure to open and close electrical contacts. 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 or unloading control of the pump, the sequential action of the actuators, the safety protection and interlock of the system, etc. It consists of pressure-displacement conversion components and micro switch. According to the structure type of pressure-displacement conversion parts, there are four types: plunger type, spring type, diaphragm type and bellows type. There are two types of plunger structure: single plunger type and double plunger type. The single plunger type can be divided into three types: plunger, differential plunger and plunger-lever. According to the contacts, there are single contact and double electric shock.
The pressure switch is a function switch that automatically turns on or off when the set value is reached according to the set pressure.
Pressure switches and pressure relays can only be turned on or off at a pressure you set for simple position control, all of which are digital outputs! Pressure relays can provide more output nodes or node types than pressure switches. The output of the pressure sensor can be an analog signal or a digital signal, which is convenient for subsequent processing, and can also be converted into a standard transmitter signal for remote transmission.
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