Q. What is a dew point meter and how to measure it?

Answer

The dew point is the temperature below which water vapor in air may condense as dew or frost. The amount of water vapor that the air can retain remains constant regardless of the temperature.Choose a gauge that can accurately measure the range a user needs.Instruments from Vaisala can be used under process pressure, however, there are other brands available that can't. They can be set up to measure dew point after compressed air has been expanded to atmospheric pressure, but if dew point is the desired measurement parameter, the dew point value measured will need to be corrected.Do what the manufacturer suggests. Because of the lack of airflow, dew point sensors should not be placed at the end of stubs or other "dead end" sections of pipe.