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Principle and Application of Negative Pressure Gauge

Negative pressure gauge, also known as vacuum gauge, is an instrument used to measure pressure below atmospheric pressure. It is widely used in various industrial and scientific research fields, such as chemical, medical, environmental protection, aerospace and so on. Negative pressure gauges can provide important information about the vacuum level in a system, which is vital to ensure the normal operation of equipment and process safety. In this paper, we will introduce the working principle of the negative pressure gauge, types, applications and considerations in practice.

The working principle of the negative pressure gauge

The basic working principle of the negative pressure gauge is to determine the vacuum level by measuring the pressure difference between the measured environment and atmospheric pressure. Most of the negative pressure gauge consists of a sealed metal diaphragm, one side of the diaphragm is connected to the measured negative pressure source, the other side is open to the atmospheric pressure environment. When the pressure of the measured environment is lower than atmospheric pressure, the diaphragm deforms due to the pressure difference. This deformation is converted by a mechanical linkage into a movement of the pointer, which indicates the pressure value on the dial.

The types of negative pressure gauge

  1. Mechanical negative pressure gauge: this is the most common type, which measures and displays pressure through physical deformation. The advantages are simple structure, low cost, no power supply, but the accuracy and stability is relatively low.
  2. Air pressure regulator digital: It uses sensors and electronics to measure pressure and can provide higher accuracy and stability. Digital Negative Pressure Gauges are usually equipped with an LCD display, which can visually display more information, such as pressure trends, peak recordings, and so on.
  3. Capillary Negative Pressure Gauge: Uses the difference in height of a liquid in a capillary tube to measure pressure. This type of negative pressure gauge is usually used in the laboratory, for very low pressure can also provide high measurement accuracy.

The application of negative pressure gauge

  1. Chemical industry: In the chemical production process, many reactions need to be carried out under specific pressure conditions, the negative pressure gauge is used to monitor and control the pressure of the reactor to ensure safety and improve yield.
  2. Medical equipment: In the medical field, negative pressure gauges are commonly used in suction equipment and ventilators to monitor and regulate the strength of negative pressure to ensure patient safety.
  3. Environmental monitoring: In environmental monitoring, negative pressure gauges are used to detect pressure changes in closed environments, such as pollutant sampling equipment.
  4. Aerospace: In the aerospace field, negative pressure gauges are used to monitor the environmental pressure in spacecraft to ensure the safety of the equipment and crew.
  5. The use of negative pressure gauge precautions

    1. Regular calibration: In order to ensure the accuracy of measurement, the negative pressure gauge needs to be calibrated regularly. Temperature and humidity changes in the environment may affect the accuracy of the negative pressure gauge.
    2. Correct installation: When installing the negative pressure gauge, you need to make sure that the connection between it and the measured system is well sealed to avoid leakage, which is especially important for low-pressure measurement.
    3. Protective measures: when using the negative pressure gauge in high temperature, corrosive or humid environments, additional protective measures may be required, such as the use of special materials made of negative pressure gauges or the installation of protective covers.

    Conclusion

    The negative pressure gauge is a very useful tool that plays an important role in several fields. Understanding how it works, the different types and how to use and maintain it correctly is crucial to giving full play to its function and prolonging its service life. With the development of technology, the accuracy and functionality of negative pressure gauges are constantly being improved, offering the possibility of a wide range of complex and delicate applications.


Post time: 2024-04-30 14:55:15
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