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°C (−99°F).
1.2.2 Method B describes the manual chilled mirror or dew cup method for measurement of dew point as low as − 73°C (−99°F).
1.2.3 Method C describes the adiabatic expansion method for measurement of dew point as low as − 62°C (−80°F).
1.2.4 Method D describes the capacitance method for measurement of dew point as low as − 110°C (−166°F).
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warnings, see 8.1.1, 9.2, 10.1.2 and 10.2.5.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1933 Specification for Nitrogen Gas as an Electrical Insulating Material
D2472 Specification for Sulfur Hexafluoride
D3283 Specification for Air as an Electrical Insulating Material
adiabatic expansion; aluminum oxide; chilled mirror; condensation; dew point; electrical insulating gas; fog; hygrometer; moisture content; SF6; silicon oxide; water vapor content; Dew/frost point; Electrical insulating gases; Water vapor content
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Citing ASTM Standards
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