Dew point is defined as the temperature at which the water vapor
pressure of a gas equals the saturated water vapor pressure. It is
therefore the temperature at which condensation "just begins" to
occur if a gas is cooled. Dew point is a fundamental unit and
directly equivalent to water vapor pressure or parts per million.
It is a very convenient measure of actual water content of a gas
because it is not a function of temperature in the same way
relative humidity is.
How to Measure Dew Point?
Knowing the compressed air dew point is critical to many
processes. Excessive moisture can result in poor product quality,
significant downtime, or corrosion and damage to critical equipment
resulting in expensive repairs and lost revenue. To minimize
moisture problems, reliable on-line dew point measurement is a
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