1. What is the function of pressure sensor
Pressure sensors are mainly used in boosting cylinders, superchargers, gas-liquid boosting cylinders, gas-liquid superchargers, Presses, compressors, air conditioning and refrigeration equipment and other fields.
1. Application in 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 systems
Pressure sensors are often used in safety control systems, mainly in 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.
In the field of safety control, applications 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 its 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. Application 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 plastic pressure somewhere between the mold cavitiesforce.
4. Application in monitoring mine pressure
Sensor technology is one of the key technologies for mine pressure monitoring. On the one hand, we should correctly apply various existing sensors to serve the mining industry; on the other hand, as sensor manufacturers, we must also research and develop new pressure sensors to adapt to more mining industry applications. There are many types of pressure sensors. Based on the special environment of mine pressure monitoring, mining pressure sensors mainly include: vibrating wire pressure sensors, semiconductor piezoresistive pressure sensors, metal strain gauge pressure sensors, differential transformer pressure sensors, etc. These sensors are widely used in the mining industry. The specific sensor to be used depends on the specific mining environment.
5. Used to promote sleep
The pressure sensor itself cannot promote sleep. We just put the pressure sensor under the mattress because the pressure sensor has high Sensitivity. When a person makes related actions such as turning over, heartbeat, and breathing, the sensor will analyze this series of information to infer what state the sleeping person is in during sleep. Then, by analyzing the sensor, the sensor signal is collected to obtain the heartbeat and breathing rhythm. Waiting for sleep data, and finally processing all the data into a piece of music, of course it can compress your night’s sleep into a piece of music of a few minutes.
6. Used in compressors, air conditioning and refrigeration equipment
Pressure sensors are often used in air pressure machines, as well as air conditioning and refrigeration equipment. These sensor products are compact in appearance. , easy to install, the pressure guide port generally adopts a special valve needle design.
2. Selection Principles of Pressure Sensors
Modern sensors vary widely in principle and structure. How to choose a reasonable one according to the specific measurement purpose, measurement object and measurement environment? Selecting the correct sensor is the first problem that must be solved when measuring a certain quantity. Once the sensor is determined, the matching measurement methods and measurement equipment can also be determined. The success or failure of the measurement results depends to a large extent on the reasonable selection of the pressure sensor.
1. Determine the type of sensor according to the measurement object and measurement environment.
To carry out a specific measurement work, you must first consider which principle to use. Sensor, this needs to be determined after analyzing many factors. Because, even when measuring the same physical quantity, there are sensors with multiple principles to choose from. Which principle of sensor is more suitable? You need to consider the following specific issues based on the characteristics of the measured object and the use conditions of the sensor: the size of the measuring range; The requirements for the sensor volume at the measured location; whether the measurement method is contact or non-contact; the signal extraction method, wired or non-contact measurement; the source of the sensor, domestic or imported, whether the price is affordable, or self-developed.
After considering the above issues, you can determine what type of sensor to choose, and then consider the specific performance indicators of the sensor.
2. Selection of sensitivity
Generally, within the linear range of the sensor, it is hoped that the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change will be relatively large, which is beneficial to signal processing. However, it should be noted that the sensor has high sensitivity, and external noise unrelated to the measurement is easily mixed in, and will be amplified by the amplification system, affecting the measurement accuracy. Therefore, the sensor itself is required to have a high signal-to-noise ratio to minimize interference signals introduced from the outside world.
The sensitivity of the sensor is directional. When the measured object is a single vector and its directivity requirements are high, a sensor with small sensitivity in other directions should be selected; if the measured object is a multi-dimensional vector, the cross-sensitivity of the sensor must be as small as possible.
3. Frequency response characteristics
The frequency response characteristics of the sensor determine the frequency range to be measured, and measurement without distortion must be maintained within the allowed frequency range. Conditions, in fact, there is always a certain delay in the response of the sensor, and it is hoped that the delay time will be as short as possible.
The frequency response of the sensor is high, and the frequency range of the measurable signal is wide. However, due to the influence of structural characteristics, the inertia of the mechanical system is large, so the frequency of the measurable signal is lower due to the sensor with low frequency. .
In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient, random, etc.) to avoid excessive errors.
4. Linear range
The linear range of the sensor refers to the range in which the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its measuring range and a certain measurement accuracy can be guaranteed. When selecting a sensor, after the sensor type is determined, you must first check whether its measuring range meets the requirements.
But in fact, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, a sensor with a small nonlinear error can be approximately regarded as linear within a certain range, which will bring great convenience to the measurement.
5. Stability
After a sensor is used for a period of time, its ability to maintain its performance unchanged is called stability. In addition to the structure of the sensor itself, the factors that affect the long-term stability of the sensor are mainly the environment in which the sensor is used. Therefore, in order for the sensor to have good stability, the sensor must have strong environmental adaptability.
Before selecting a sensor, you should investigate its usage environment and select an appropriate sensor based on the specific usage environment, or take appropriate measures to reduce the impact on the environment.
The stability of the sensor is certainAfter the service period has expired, the sensor should be recalibrated before use to determine whether the performance of the sensor has changed.
In some situations where the sensor is required to be used for a long time but cannot be easily replaced or calibrated, the stability requirements of the selected sensor are more stringent and must be able to withstand the test of a long time.
6. Accuracy
Accuracy is an important performance indicator of the sensor, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and there is no need to choose it too high. In this way, a cheaper and simpler sensor can be selected among many sensors that meet the same measurement purpose.
If the measurement purpose is qualitative analysis, it is enough to choose a sensor with high repeatability accuracy. It is not suitable to choose a sensor with high absolute value accuracy; if it is for quantitative analysis and accurate measurement values must be obtained, you need to choose a precision sensor. Sensors whose grade meets the requirements.
For some special use occasions, if a suitable sensor cannot be selected, you need to design and manufacture the sensor yourself. The performance of the self-made sensor should meet the usage requirements.
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