Pressure Sensors, Relays, and Pressure Switches

Many people can't tell the difference between pressure sensors, pressure relays and pressure switches. Today, let's focus on the difference between pressure sensors, pressure relays, and pressure switches.

The pressure sensor is composed of a pressure-sensitive element and a conversion circuit, and uses the pressure of the measured medium to act on the pressure-sensitive element to produce a minute change in current or voltage output. Sensors often need to be used with external amplifier circuits to complete the process from pressure detection to control and display. Since the pressure sensor is a primary component, the signal fed back by the pressure sensor needs to be processed, analyzed, stored, and controlled by the measurement and control system, so that the industrial automation equipment and engineering operation control can be more intelligent.

Pressure relays are liquid-electric switch signal conversion elements that use liquid pressure to open and close electrical contacts. When the system pressure reaches the set pressure of the relay, an electrical signal is issued to control the actions of the electrical components, to implement the pump load or discharge control, the sequential operation of the actuator, the system's safety protection and interlocking. It consists of pressure-displacement conversion components and microswitches. According to the structure type of the pressure-displacement conversion member, there are four types of plunger type, spring type, diaphragm type, and bellows type. Among them, the plunger structure is divided into two kinds: single plunger type and double plunger type. The single plunger can be divided into three types: plunger, differential plunger and plunger-lever. According to the contact points to a single contact and double electric shock and so on.

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, pressure relays, can only be turned on or off at a given pressure, used for simple position control, are digital outputs! Pressure relays can provide more output nodes or nodes than pressure switches Types of. The output of the pressure sensor can be either an analog signal or a digital signal, which can be easily processed at the back stage or can be converted into a standard transmitter signal for remote transmission.