What are the common pressure sensors? What is the role?

The pressure sensor is a device or device that can sense the pressure signal and convert the pressure signal into usable output electrical signal according to certain rules. It is usually composed of pressure sensing elements and signal processing units. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. This article has collected and collated some materials, hoping to be of great reference value to all readers.

There are four kinds of common pressure sensors:

1. Strain type pressure sensor

Strain type pressure sensor is mainly used to measure the pressure by measuring the strain of elastic elements. According to different manufacturing materials, strain elements are divided into metal and semiconductor. When the conductor and semiconductor material have mechanical deformation, its resistance value will change.

2. Piezoresistive pressure transducer

Piezoresistive pressure sensor is made of piezoresistive effect of monocrystalline silicon material and integrated circuit. The resistivity of monocrystalline silicon material will change under the action of force. At this time, the electrical signal proportional to the force change will be output through the measuring circuit. Different from the stick-type strain gauge, the measured pressure is mainly felt through the silicon diaphragm.

3. Capacitive pressure sensor

Capacitive pressure sensor mainly uses capacitance to convert the measured pressure into a pressure sensor with capacitance value changed. The electrode of the capacitor is circular metal film or plated metal film. When the film feels the pressure, the capacitance changes and forms an electrical signal.

4. Piezoelectric pressure sensor

Piezoelectric pressure sensor is an instrument that uses piezoelectric effect to convert pressure into electricity by electrical components and other machinery, and then carries out relevant measurement work.

Function of pressure sensor

1. Applied to safety control system

The pressure sensor is often used in the safety control system, mainly for the safety management system of the air compressor itself. There are many sensor applications in the field of safety control. As a very common sensor, it is not surprising that the pressure sensor is applied in the safety control system.

In the field of safety control, the application is generally considered in terms of performance, price, and the safety and convenience of actual operation. It has been proved that the effect of selecting pressure sensor is very good. The pressure sensor uses the processing technology of mechanical equipment to install some components and signal regulators on a small chip. Therefore, its small size is also one of its advantages. In addition, its cheap price is also another advantage. To some extent, it can improve the accuracy of system testing. In the safety control system, the pressure brought by the compressor is controlled to a certain extent by installing a pressure sensor in the pipeline equipment at the air outlet. This is a certain protection measure and a very effective control system. After the compressor is started normally, if the pressure value does not reach the upper limit, the controller will open the air inlet to make the equipment reach the maximum power through adjustment.

2. Applied to injection mold

Pressure sensor plays an important role in injection mold. The pressure sensor can be installed in the nozzle of the injection molding machine, the hot runner system, the cold runner system and the mold cavity of the mold. It can measure the plastic pressure from the nozzle of the injection molding machine to the mold cavity somewhere during the injection molding, mold filling, pressure maintaining and cooling process.

3. Applied to monitor mine pressure

Sensor technology is one of the key technologies of mine pressure monitoring. On the one hand, we should correctly apply the existing sensors to serve the mining industry; On the other hand, as a sensor manufacturer, we need to develop and develop new pressure sensors to adapt to more mining industry applications. There are many kinds of pressure sensors, and based on the special environment of mine pressure monitoring, mine pressure sensors mainly include: vibrating wire pressure sensor, semiconductor piezoresistive pressure sensor, metal strain gauge pressure sensor, differential transformer pressure sensor, etc. These sensors have a wide range of applications in the mining industry, and the specific type of sensor to be used depends on the specific mining environment.

4. Apply to promote sleep

The pressure sensor itself cannot promote sleep. We just put the pressure sensor under the mattress. Because of the high sensitivity of the pressure sensor, when people turn over, heartbeat, breathe and other related actions, the sensor will analyze this series of information to infer what state the sleeping person is in, and then collect the signal of the sensor to obtain sleep data such as heartbeat and respiratory rhythm through the analysis of the sensor, Finally, you can process all the data into one piece of music, which can compress your sleep in one night into a few minutes of music.

5. Applied to compressors, air conditioning and cooling equipment

Pressure sensors are often used in air presses and air conditioning and refrigeration equipment. These sensor products are compact in shape, easy to install, and the pressure guide port is generally designed with a special valve needle.

Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.