ASTM E337 - 15(2023)
Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
| Aviso: | Las normas ASTM en lectura se visualizan a través del área decliente. Los archivos no se pueden descargar |
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| Fecha edición: |
2023-01-01
En Vigor
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| Idiomas disponibles: | Inglés |
| Resumen: | |
| Keywords: | aspiration; humidity; psychrometer; psychrometric table; temperature; vapor pressure; ventilation; wet-bulb temperature; |
| Scope: | 1.1 General: 1.1.1 This test method covers the determination of the humidity of atmospheric air by means of wet- and dry-bulb temperature readings. 1.1.2 This test method is applicable for meteorological measurements at the earth's surface, for the purpose of the testing of materials, and for the determination of the relative humidity of most standard atmospheres and test atmospheres. 1.1.3 This test method is also applicable when the temperature of the wet bulb only is required. In this case, the instrument comprises a wet-bulb thermometer only. 1.1.4 Relative humidity (RH) does not denote a unit. Uncertainties in the relative humidity are expressed in the form RH ± rh %, which means that the relative humidity is expected to lie in the range (RH − rh) % to (RH + rh) %, where RH is the observed relative humidity. All uncertainties are at the 95 % confidence level. 1.2 Method A—Psychrometer Ventilated by Aspiration: 1.2.1 This method incorporates the psychrometer ventilated by aspiration. The aspirated psychrometer is more accurate than the sling (whirling) psychrometer (see Method B), and it offers advantages in regard to the space which it requires, the possibility of using alternative types of thermometers (for example, electrical), easier shielding of thermometer bulbs from extraneous radiation, accidental breakage, and convenience. 1.2.2 This method is applicable within the ambient temperature range 5 °C to 80 °C, wet-bulb temperatures not lower than 1 °C, and restricted to ambient pressures not differing from standard atmospheric pressure by more than 30 %. 1.3 Method B—Psychrometer Ventilated by Whirling (Sling Psychrometer): 1.3.1 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 Warning—Mercury 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. (For more specific safety precautionary statements, see 8.1 and 15.1.) 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. |
| ICS: | 07.060 - Geología. Meteorología. Hidrología |
| CTN: | D22.11 - D22.11 |
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Otras Relaciones |
Es referenciada por C1773-21 Es referenciada por C1368-18 Es referenciada por F1980-21 Es referenciada por D3267-20 Es referenciada por C1684-18R23 Es referenciada por C1469-22 Es referenciada por E0800-20 Es referenciada por D2724-19 Es referenciada por C1425-19 Es referenciada por C1899-21 Es referenciada por D5582-22 Es referenciada por E0606_E0606M-21 Es referenciada por F2825-18 Es referenciada por D3154-14R23 Es referenciada por C1819-21 Es referenciada por D7779-20 Es referenciada por D7295-18 Es referenciada por D3276-21 Es referenciada por D0584-10R18 Es referenciada por C1323-22 |
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