ASTM D2029-97
Standard Test Methods for Water Vapor Content of Electrical Insulating Gases by Measurement of Dew Pointstandard by ASTM International, 04/10/1997
1.1 These test methods describe the determination of the water vapor content of electrical insulating gases by direct or indirect measurement of the dew point and the calculation of the water vapor content.
1.2 The following four test methods are provided:
1.2.1 Method A describes the automatic chilled mirror method for measurement of dew point as low as -73