Pressure sensor usage precautions - Solutions - Huaqiang Electronic Network

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A pressure sensor is a sensor that converts this pressure into an output signal that can be utilized when pressure is felt. It is manufactured according to the principle of piezoelectric effect. Usually, a piezoelectric sensor can only measure dynamic pressure. It can not be used in static measurement situations. This is because the charge generated when subjected to mechanical external force has an infinite input resistance only when it is in the loop, and can be saved at this time. In everyday industrial practice, pressure sensors have become a very widely used sensor, and many industries have invested heavily in controlling the quality of the environment.

The pressure sensor was developed based on the polarization effect. So what is this polarization effect? Crystal, I believe everyone is familiar with it. Crystals are anisotropic, not crystalline, and are isotropic. When some crystal medium is subjected to mechanical external force in a certain direction and its shape changes, this will form a polarization effect. When this mechanical external force disappears, the crystal will return to its original uncharged state. Therefore, the so-called polarization effect means that when subjected to mechanical external forces, some of the crystals may have electrification effects inside.

Many unit industries have great problems when using pressure sensors. Therefore, before you use them, you should understand the issues that need to be paid attention to during use. First, avoid touching the transmitter with corrosive and overheated media to avoid damaging it; the location of the pilot tube is preferably where the temperature fluctuations are small; when measuring some media with high temperatures At that time, the condenser must be connected, because the temperature of the transmitter should be kept above a certain limit during operation; keep the conduit unobstructed; if it is installed outdoors during cold winters, If you want to pay attention to taking anti-freeze measures, this is to prevent the liquid in the pressure-inducing port from expanding due to icing, which is easy to damage the sensor; the user should wear the cable when wiring The waterproof joint is either a reductive tube and then tightens the sealing nut, which prevents liquid from leaking through the cable into the housing of the transmitter. Now let's talk about the precautions when measuring liquid pressure and gas pressure. When measuring the pressure of the liquid, the pressure tap must be opened on the side of the process pipe. This is to prevent the sedimentation of the dross. At this time, the place where the transmitter is installed should prevent the impact of other liquids. The sensor is damaged due to excessive pressure. When measuring the gas pressure, the pressure port must be opened at the top of the process pipe. Note that this is the difference from the pressure of the liquid. Then the transmitter must be installed in the upper part of the process pipe. This is convenient. The accumulated liquid can be easily injected into the process piping.

In the daily life, the use and purchase of pressure sensors need to have a certain understanding, especially when using, if you do not understand the precautions, it is easy to cause the machine to malfunction or damage the sensor phenomenon, or cause measurement The accuracy is reduced or even the data is wrong.