The so-called dew point, the lower the temperature of the dew point sensor picture, the smaller the saturated water pressure. Therefore, for air containing a certain amount of water vapor, the temperature is lowered while the air pressure is constant, and the saturated water vapor pressure is reduced to a temperature equal to the actual water vapor pressure at that time, which is called a dew point. Supplement: When the temperature is below zero degrees Celsius, it is also called frost point. From this we can not see the dew point and pressure, the temperature has a close relationship.

The amount of water in a variety of traits often affects the performance, use, quality and storage of the substance. For example, the water content of the process gas will affect the electrical insulation properties and process state of the product; the moisture content of the power gas will affect the service life of pneumatic instruments and equipment. The reason is mainly that H2O is an extremely active substance, which is easy to chemically react with other substances, and is also easily decomposed into oxidizing substances. We usually refer to the water content in the ambient atmosphere as relative humidity. The moisture content of industrial gases is expressed by the dew point temperature or PPm value. The dew point analyzer is simply a dew point meter, which is an instrument used to measure the moisture content of a gas.