In PSA air separation equipment, "dew point" refers to the content of water vapor in the gas when it reaches a saturated state, and is a measure of the absolute humidity of the gas. Generally speaking, the lower the dew point, the drier the air. Of course, the above are only for the normal pressure state, if the pressure is involved, the dew point will also change accordingly. For example, in 0.7MPa compressed air, the "pressure dew point" is assumed to be 2°C, then the dew point under normal pressure is -23°C. When the pressure is increased to 1.0MPa, under the same "pressure dew point" (2°C), the corresponding atmospheric pressure dew point drops to -28°C. It can be seen that under the environment of constant "pressure dew point", the higher the pressure, the lower the corresponding atmospheric dew point.

In response to this rule, some people have shown the conversion relationship between atmospheric pressure dew point and pressure dew point through calculation and chart. I believe the following table will bring some convenience to the relevant personnel in the compressed air purification industry and the industry using compressed air.