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[Chemical Knowledge]：The working principle and use method of pressure gauge

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A pressure gauge is a widely used instrument for measuring pressure, vacuum and differential pressure. Its structure varies according to the principle of pressure measurement, but it generally includes a dial and a pointer, as well as a pressure measurement interface connected to the measured medium. Below we have a detailed understanding of the working principle and use of pressure gauges. The working principle of

1. pressure gauge The working principle of

pressure gauge depends on its pressure measuring principle. Common pressure measuring principle has the following several kinds:

1. elastic element method

elastic element pressure gauge is one of the most common pressure gauge, it through the elastic element (such as spring) transformation of the measured medium pressure deformation, by detecting the deformation to measure the pressure value.

2. vibration method

vibration pressure gauge using pressure acting on a vibration tube or vibration chip, and make their vibration frequency is affected, there is no connection when the normal frequency measurement can determine the pressure size.

3. hydrostatic pressure method

hydrostatic pressure gauge by directly measuring the hydrostatic pressure generated by the measured medium to determine the pressure value.

4. induction method

induction pressure gauge by measuring the change of the earth's field intensity to detect the change of the measured pressure, which is equivalent to the realization of contactless pressure measurement.

2. pressure gauge use method

1. need to check the accuracy of the pressure gauge before use, calibrate it.

2. The correct connection of the measured medium, the need to pay special attention to the range of the pressure gauge, do not exceed its range.

3. Keep the pressure gauge clean and do not let dust and oil affect the measurement results.

4. Pay attention to the temperature of the measured medium, because changes in temperature will have a certain impact on the pressure reading.

5. During use, avoid the emergency shock or vibration of the measured medium to avoid adverse effects on the pressure gauge.

6. after use should be properly kept, pay attention to prevent vibration and collision.

pressure gauge, as a common measuring instrument, is widely used in industry, metallurgy, aviation, chemical industry and other fields, and has an irreplaceable situation. Understanding its working principle and correct use can improve work efficiency and reduce work errors. It is an essential learning content for everyone.