Standard Test Method of
Measuring Humidity with Cooled-Surface Condensation
(Dew-Point) Hygrometer1

This standard is issued under the fixed designation D 4230; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of the last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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 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 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
precautionary statements, see Section 8.

2. Referenced Documents

2.1 ASTM Standards:
D 1356 Terminology Relating to Sampling and Analysis of
Atmospheres2
D 3631 Test Methods for Measuring Surface Atmospheric
Pressure2

3. Terminology

3.1 Definitions:

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