Yes, a low dew point of refrigerated air dryer means the compressed air is dry because dew point is the temperature at which water vapor in the air condenses into liquid water. A low dew point indicates that there is very little water vapor present, meaning the air must be cooled to a much lower temperature before moisture will form, which signifies a drier air.
Pressure Dew Point (PDP): For compressed air, the relevant measurement is the Pressure Dew Point (PDP). This is the temperature at which water vapor condenses at the specific pressure of the compressed air system.
Low PDP = Low Moisture: A low PDP value means there are small amounts of water vapor in the compressed air.
High PDP = High Moisture: Conversely, a higher PDP value means there is more water vapor in the air.
Significance: In industrial applications, a low dew point is crucial to prevent condensation, corrosion, and other problems in pneumatic systems.