ASTM E337-02(2007)
(Test Method)Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
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 to 80C, wet-bulb temperatures not lower than 1C, 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 to 50C, wet-bulb temperatures not lower than 1C and restricted to ambient pressures not differing from standard atmospheric pressure by more than 30 %.
1.4 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 more specific safety precautionary statements, see 8.1 and 15.1 .)
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Designation: E337 − 02(Reapproved 2007)
Standard Test Method for
Measuring Humidity with a Psychrometer (the Measurement
1
of Wet- and Dry-Bulb Temperatures)
This standard is issued under the fixed designation E337; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.3.2 Thismethodisapplicablewithintheambienttempera-
turerange5to50°C,wet-bulbtemperaturesnotlowerthan1°C
1.1 General:
and restricted to ambient pressures not differing from standard
1.1.1 This test method covers the determination of the
atmospheric pressure by more than 30%.
humidity of atmospheric air by means of wet- and dry-bulb
1.4 This standard does not purport to address all of the
temperature readings.
safety concerns, if any, associated with its use. It is the
1.1.2 This test method is applicable for meteorological
responsibility of the user of this standard to establish appro-
measurements at the earth’s surface, for the purpose of the
priate safety and health practices and determine the applica-
testing of materials, and for the determination of the relative
bility of regulatory limitations prior to use. (For more specific
humidity of most standard atmospheres and test atmospheres.
safety precautionary statements, see 8.1 and 15.1.)
1.1.3 This test method is also applicable when the tempera-
ture of the wet bulb only is required. In this case, the
2. Referenced Documents
instrument comprises a wet-bulb thermometer only.
2
2.1 ASTM Standards:
1.1.4 Relative humidity (RH) does not denote a unit. Un-
D861PracticeforUseoftheTexSystemtoDesignateLinear
certainties in the relative humidity are expressed in the form
Density of Fibers, Yarn Intermediates, and Yarns
RH 6 rh%,whichmeansthattherelativehumidityisexpected
D1193Specification for Reagent Water
to lie in the range (RH − rh)% to (RH + rh )%, where RH is
D1356Terminology Relating to Sampling and Analysis of
theobservedrelativehumidity.Alluncertaintiesareatthe95%
Atmospheres
confidence level.
D1357Practice for Planning the Sampling of the Ambient
1.2 Method A—Psychrometer Ventilated by Aspiration:
Atmosphere
1.2.1 This method incorporates the psychrometer ventilated
D3631Test Methods for Measuring Surface Atmospheric
by aspiration. The aspirated psychrometer is more accurate
Pressure
than the sling (whirling) psychrometer (see Method B), and it
D4023Terminology Relating to Humidity Measurements
offers advantages in regard to the space which it requires, the
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(Withdrawn 2002)
possibility of using alternative types of thermometers (for
D4230Test Method of Measuring Humidity with Cooled-
example, electrical), easier shielding of thermometer bulbs
Surface Condensation (Dew-Point) Hygrometer
from extraneous radiation, accidental breakage, and conve-
E1Specification for ASTM Liquid-in-Glass Thermometers
nience.
IEEE/ASTM SI-10Practice for Use of the International
1.2.2 Thismethodisapplicablewithintheambienttempera-
System of Units (SI) (the Modernized Metric System)
ture range 5 to 80°C, wet-bulb temperatures not lower than
1°C, and restricted to ambient pressures not differing from
3. Terminology
standard atmospheric pressure by more than 30%.
3.1 Definitions:
1.3 Method B—Psychrometer Ventilated by Whirling (Sling
3.1.1 For definitions of humidity terms used in this test
Psychrometer):
method, refer to Terminology D4023.
1.3.1 This method incorporates the psychrometer ventilated
3.1.2 Fordefinitionsofothertermsinthistestmethod,refer
by whirling (sling psychrometer).
to Terminology D1356.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D22 on Air contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Quality and is the direct responsibility of Subcommittee D22.11 on Meteorology. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Oct. 1, 2007. Published December 2007. Originally the ASTM website.
3
approved in 1931. Last previous edition approved in 2002 as E337-02. DOI: The last approved version of this historical standard is referenced on
10.1520/E0337-02R07. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E337 − 02 (2007)
3.2 Definitions of Terms Specific to This Standard: required for accurately measuring the humidity in the atmo-
sphere. Only the essential features of the psychrometer are
3.2.1 Method A—Aspirated Psychrometer:
specified.
3.2.1.1 aspiration—The wet and dry bulbs (and the
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
e1
Designation:E337 –84 (Reapproved 1996) Designation:E337 –02 (Reapproved 2007)
Standard Test Method for
Measuring Humidity with a Psychrometer (the Measurement
1
of Wet- and Dry-Bulb Temperatures)
This standard is issued under the fixed designation E337; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1
e NOTE—Section 20 was added editorially in April 1996.
1. 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)(RH) does not denote a unit. Uncertainties in the relative humidity are expressed in the formURH
6 urh % rh, %, which means that the relative humidity is expected to lie in the range (URH − urh)% to (U RH + urh )%, where
U 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 Thismethodincorporatesthepsychrometerventilatedbyaspiration.Theaspiratedpsychrometerismoreaccuratethanthe
sling (whirling) psychrometer (see Method B), and it offers advantages in regard to the space which it requires, the possibility of
usingalternativetypesofthermometers(forexample,electrical),easiershieldingofthermometerbulbsfromextraneousradiation,
accidental breakage, and convenience.
1.2.2 Thismethodisapplicablewithintheambienttemperaturerange5to80°C,wet-bulbtemperaturesnotlowerthan1°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 Thismethodisapplicablewithintheambienttemperaturerange5to50°C,wet-bulbtemperaturesnotlowerthan1°Cand
restricted to ambient pressures not differing from standard atmospheric pressure by more than 30%.
1.4 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 more specific safety precautionary statements, see 8.1 and 15.1.)
2. Referenced Documents
2
2.1 ASTM Standards:
D861 Practice for Use of the Tex System to Designate Linear Density of Fibers, Yarn Intermediates, and Yarns
D1193 Specification for Reagent Water
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D1357 Practice for Planning the Sampling of the Ambient Atmosphere
D3631 Test Methods for Measuring Surface Atmospheric Pressure
D4023 Terminology Relating to Humidity Measurements
D4230 Test Method of Measuring Humidity with Cooled-Surface Condensation (Dew-Point) Hygrometer
E1 Specification for ASTM Liquid-in-Glass Thermometers
1
This test method is under the jurisdiction ofASTM Committee D-22 on Sampling andAnalysis ofAtmospheres and is the direct responsibility of Subcommittee D22.11
on Meteorology.
Current edition approved Nov. 30, 1984. Published June 1985. Originally published as E 337 – 31 T. Last previous edition E 337 – 62.
1
This test method is under the jurisdiction of ASTM Committee D22 on Air Quality and is the direct responsibility of Subcommittee D22.11 on Meteorology.
Current edition approved Oct. 1, 2007. Published December 2007. Originally approved in 1931. Last previous edition approved in 2002 as E337-02.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
, Vol 07.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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E337 –02 (2007)
EI380EEE/ASTM SI-10 Practice
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