ASTM D4230 - 20

    Standard Test Method for Measuring Humidity with Cooled-Surface Condensation (Dew-Point) Hygrometer

    Active Standard ASTM D4230 | Developed by Subcommittee: D22.11

    Book of Standards Volume: 11.07


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    Significance and Use

    5.1 Humidity information is important for the understanding of atmospheric phenomena and industrial processes. Measurements of the dew-point and calculations of related vapor pressures are important to quantify the humidity information.

    1. Scope

    1.1 This test method covers the determination of the thermodynamic dew- or frost-point temperature of ambient air by the condensation of water vapor on a cooled surface. For brevity, this is referred to in this test method as the condensation temperature.

    1.2 This test method is applicable for the range of condensation temperatures from 60°C to −70°C.

    1.3 This test method includes a general description of the instrumentation and operational procedures, including site selection, to be used for obtaining the measurements and a description of the procedures to be used for calculating the results.

    1.4 This test method is applicable for the continuous measurement of ambient humidity in the natural atmosphere on a stationary platform.

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

    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 specific precautionary statements, see Section 8.

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1356 Terminology Relating to Sampling and Analysis of Atmospheres

    D3631 Test Methods for Measuring Surface Atmospheric Pressure


    ICS Code

    ICS Number Code 07.060 (Geology. Meteorology. Hydrology)

    UNSPSC Code

    UNSPSC Code 41112300(Humidity and moisture measuring instruments)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D4230-20

    Citation Format

    ASTM D4230-20, Standard Test Method for Measuring Humidity with Cooled-Surface Condensation (Dew-Point) Hygrometer, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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