The maximum possible water vapor partial pressure in the air is called saturation vapor pressure and is determined by the temperature. PTotal = pN 2 + pO 2 + pAr + pCO 2 + e‘ or pTotal = pa + e‘ For the total pressure of humid air, the following applies: Therefore, for fully dry air at sea level (1013.25 hPa) the following applies:Īnother common component of air is water vapor (= water in its gaseous phase). Other components of air can be ignored as their share is negligible. The main constituents of air are nitrogen (N 2), oxygen (O 2), argon (Ar) and carbon dioxide (CO 2). In contrast, the measurement of relative humidity (RH) indicates how close the air is to the saturation point.ĭalton's Law states the total pressure of an (ideal) gas mixture is the sum of the partial pressures of the individual gases. The dew point measurement relates to the absolute amount of water vapor contained in the air. The dew point, or dew point temperature (Td), is the temperature to which the air must be cooled for the water contained in the air to start condensing. Reliable measurement and continuous monitoring of the dew point in compressed air systems using dew point transmitters, such as the E+E Elektronik EE371, can help ensure smooth production processes and product quality. The following explains the basics of dew point measurement and what is important in practice. Therefore, operators of compressed air systems should address this issue before it causes serious and costly issues. A too high humidity content can have negative effects on the quality of the final product, lead to problems during the manufacturing process, or even result in complete system shutdown. The dew point provides information about the absolute humidity content of the compressed air. Wherever compressed air is used, accurate and continuous monitoring of the dew point temperature is advisable.
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