ASTM-E104 › Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
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Scope
1.1 This practice describes two methods for generating constant relative humidity (rh) environments in relatively small containers.
1.2 This practice is applicable for obtaining constant relative humidities ranging from dryness to near saturation at temperatures spanning from 0 to 50°C.
1.3 This practice is applicable for closed systems such as environmental conditioning containers and for the calibration of hygrometers.
1.4 This practice is not recommended for the generation of continuous (flowing) streams of constant humidity unless precautionary criteria are followed to ensure source stability. (See Section 9.)
1.5 Caution-Both saturated salt solutions and sulfuric acid-water solutions are extremely corrosive, and care should be taken in their preparation and handling. There is also the possibility of corrosive vapors in the atmospheres over the saturated salt solutions and over the sulfuric acid solution.
1.6 This standard does not purport to address all of the safety problems 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 more specific safety precautionary information see 1.5 and 10.1.
Keywords
Aqueous solutions; Atmospheres-conditioning/testing; Atmospheric analysis-meteorological measurements; Conditioning-electrical insulating materials; Humidity-relative; maintaining constant relative humidity, by aqueous solutions, practice; ICS Number Code 19.040 (Environmental testing)
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19.040 (Environmental testing Including testing equipment)
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Document Number
ASTM-E0104-20A
Revision Level
2020A EDITION
Status
Current
Modification Type
Reapproval
Publication Date
Dec. 21, 2020
Document Type
Practice
Page Count
5 pages
Committee Number
D22.11