How to choose a pressure sensor – we are blessed

Create Date: 2024-8-30 12:03:23|Source: P+F/Double Blessing

1. Recognize the type of pressure measurement, that is, to measure the gauge pressure, absolute pressure or differential pressure. Gauge pressure refers to the pressure value with atmospheric pressure as the zero point, which can have positive and negative values, positive above atmospheric pressure, and negative below atmospheric pressure. The absolute difference refers to the pressure value with the definite vacuum as the zero point, and the absolute pressure only has a positive value, and there is no negative value. Differential pressure refers to the difference between two pressures. Absolute pressure measurement is to enclose a reference pressure in the sensor chip, generally the size of this pressure as long as vacuum (less than 5mtor) and standard atmospheric pressure (14.7psi) two, refer to the vacuum of the sensor we call the absolute pressure sensor, for a standard atmospheric pressure sensor we call the sealed gauge pressure sensor. Since all sensors measure the pressure difference between the two diaphragms of the sensor, the pressure at the end of the differential pressure sensor can be changed. Therefore, the gauge pressure sensor (see the end can be connected to the atmosphere through a small hole) is only a differential pressure sensor of the general method.

How to choose a pressure sensor – we are blessed

How to choose a pressure sensor – we are blessed

2. Admit that the medium to be measured is a gas or a liquid, whether the medium to be measured is corrosive, and if it is a liquid, do you need to put the sensor into the liquid.

3. Acknowledge the scale of the measured pressure.

4. Recognize the accuracy level (accuracy). The measurement error of the pressure sensor is divided according to the accuracy level, and different accuracy levels correspond to different fundamental error limits, which are expressed as F.S%. There are several general accuracy grades on the market, such as 0.1, 0.25, 0.3, 0.5, 1.0, etc., and the selection can be carried out according to the required accuracy.

5. Recognize the scale of operating temperature. The temperature of the measured medium should be within the working scale of the pressure sensor, otherwise the error of the measurement result will be large and the life of the sensor will be affected. If the temperature of the measured medium is high, a high-temperature pressure sensor can be used, or a cold suspect tube can be installed to cool down.

6. Recognize the interface of pressure. The pressure interface is the threaded interface you need, M20*1.5 is the universal interface, and other threads can be customized.

7. Recognize the output signal. The output signal is generally 0-24mADC, 0-5VDC, 1-5VDC, 0-10VDC

8. Recognize the power supply voltage.

9. Acknowledge the working environment. Whether there are oscillations or electromagnetic interference, etc

10. Recognize the electrical connection method, etc. That is, what the pressure sensor signal outputs to, whether it is PLC or others.

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