ASTM E337-15(2023)

5.1?The object of this test method is to provide guidelines for the construction of a psychrometer and the techniques required for accurately measuring the humidity in the atmosphere. Only the essential features of the psychrometer are specified.

1.1?General:?

1.3?Method B1.3.1?This method incorporates the psychrometer ventilated by whirling (sling psychrometer).

1.3.2?This method is applicable within the ambient temperature range 5 ?C to 50 ?C, wet-bulb temperatures not lower than 1 ?C and restricted to ambient pressures not differing from standard atmospheric pressure by more than 30 %.

1.4?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5?WarningMercury has been designated by many regulatory agencies as a hazardous material that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.

1.6?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.