application areas of pressure sensors

2月 22, 2024

Detailed explanation of common application scenarios of pressure sensors

Pressure sensor usually consist of pressure sensitive components and signal processing units. According to different test pressure types, pressure sensor can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.Based on this type, the application fields of pressure sensors are also relatively wide.

Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, petrochemicals, oil wells, electric power, ships, machine tools, pipelines and many other industries.

Applications of pressure sensor:

The pressure sensor can directly convert the measured pressure into various forms of electrical signals to facilitate the centralized detection and control requirements of the automation system, so it is widely used in industrial production.

Pressure sensors are widely used in many monitoring and control applications. In addition to direct pressure measurement, pressure sensors can also be used to indirectly measure other quantities, such as liquid/gas flow, velocity, water surface height or altitude.

At the same time, there is also a type of pressure sensor designed to dynamically measure high-speed changing pressure. Example applications are combustion pressure monitoring in engine cylinders or pressure monitoring of gases in turbine engines. Such sensors are typically made of piezoelectric materials, such as quartz.

Some pressure sensors, such as those used in traffic enforcement cameras, operate in a binary manner. That is, when the pressure reaches a certain value, the sensor controls whether to turn on or off the circuit. This type of pressure sensor is also called a pressure switch.

The main applications are as follows:

1. Applied to hydraulic system

Pressure sensors are mainly used in hydraulic systems to complete closed-loop control of force. When the control valve core moves suddenly, a peak pressure that is several times the system working pressure will form in a very short period of time. In typical mobile machinery and industrial hydraulics, any pressure sensor that is not designed with such extreme conditions in mind will quickly become damaged. It is necessary to use an impact-resistant pressure sensor. There are two main ways to achieve impact resistance of a pressure sensor. One is to change the strain gauge chip, and the other is to connect an external coil. The first method is generally used in hydraulic systems, mainly because Easy to install. Another reason is that the pressure sensor has to withstand continuous pressure pulsations from the hydraulic pump.

2. Applied to safety control system

Pressure sensors are often used in safety control systems, and their main area is 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 pressure sensors are used in safety control systems.

Applications in the field of safety control are generally considered in terms of performance, price, and safety and convenience of actual operation. It has been proven that the effect of selecting a pressure sensor is very good. The pressure sensor uses mechanical equipment processing technology to install some components and signal conditioners on a very small chip. So small size is also one of its advantages.

In addition, its cheap price is another major advantage. To a certain 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. When the compressor starts normally, if the pressure value does not reach the upper limit, the controller will open the air inlet and adjust to make the equipment reach maximum power.

3. Used in injection molds

Pressure sensors play an important role in injection molds. The pressure sensor can be installed in the nozzle, hot runner system, cold runner system and mold cavity of the injection molding machine. It can measure the flow of plastic from the nozzle of the injection molding machine to the pressure during the injection molding, filling, pressure holding and cooling processes. The pressure of the plastic somewhere between the mold cavities.

4. Used to monitor mine pressure

There are many types of pressure sensors. Based on the special environment of mine pressure monitoring, mining pressure sensors mainly include: semiconductor piezoresistive pressure sensors, metal strain gauge pressure sensors, differential transformer pressure sensors, etc. These sensors are widely used in the mining industry, and the specific sensor to be used depends on the specific mining environment.


5. Used in compressors, air conditioning and refrigeration equipment

Pressure sensor are often used in air compressors and air conditioning and refrigeration equipment. These sensor products are compact in appearance and easy to install. The pressure guide port generally adopts a special valve needle design.

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