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ASTM E337-02

(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)

SIGNIFICANCE AND USE
The object of this test method is to provide guidelines for the construction of a psychrometer and the techniques required for accurately measuring the humidity in the atmosphere. Only the essential features of the psychrometer are specified. METHOD A—PSYCHROMETER VENTILATED
BY ASPIRATION   Top
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 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 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 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.)

General Information

Status
Historical
Publication Date
09-Oct-2002
ICS
07.060 - Geology. Meteorology. Hydrology
Technical Committee
D22 - Air Quality
Drafting Committee
D22.11 - Meteorology
Current Stage
Ref Project

Relations

Replaces
ASTM E337-84(1996)e1 - Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
Effective Date
10-Oct-2002
Replaced By
ASTM E337-02(2007) - Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
Effective Date
01-Oct-2007
Referred By
ASTM C1773-21 - Standard Test Method for Monotonic Axial Tensile Behavior of Continuous Fiber-Reinforced Advanced Ceramic Tubular Test Specimens at Ambient Temperature
Effective Date
10-Oct-2002
Referred By
ASTM C1899-21 - Standard Test Method for Flexural Strength of Continuous Fiber-Reinforced Advanced Ceramic Tubular Test Specimens at Ambient Temperature
Effective Date
10-Oct-2002
Referred By
ASTM D3924-16(2019) - Standard Specification for Standard Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials
Effective Date
10-Oct-2002
Referred By
ASTM D2724-19 - Standard Test Method for Bond Strength of Bonded, Fused, and Laminated Apparel Fabrics
Effective Date
10-Oct-2002
Referred By
ASTM D7779-20 - Standard Test Method for Determination of Fracture Toughness of Graphite at Ambient Temperature
Effective Date
10-Oct-2002
Referred By
ASTM F2016-00(2018) - Standard Practice for Establishing Shipbuilding Quality Requirements for Hull Structure, Outfitting, and Coatings
Effective Date
10-Oct-2002
Referred By
ASTM E1333-22 - Standard Test Method for Determining Formaldehyde Concentrations in Air and Emission Rates from Wood Products Using a Large Chamber
Effective Date
10-Oct-2002
Referred By
ASTM D4332-22 - Standard Practice for Conditioning Containers, Packages, or Packaging Components for Testing
Effective Date
10-Oct-2002
Referred By
ASTM C1819-21 - Standard Test Method for Hoop Tensile Strength of Continuous Fiber-Reinforced Advanced Ceramic Composite Tubular Test Specimens at Ambient Temperature Using Elastomeric Inserts
Effective Date
10-Oct-2002
Referred By
ASTM C1292-22 - Standard Test Method for Shear Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperatures
Effective Date
10-Oct-2002
Referred By
ASTM C1699-09(2023) - Standard Test Method for Moisture Retention Curves of Porous Building Materials Using Pressure Plates
Effective Date
10-Oct-2002
Referred By
ASTM C1323-22 - Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature
Effective Date
10-Oct-2002
Referred By
ASTM C1361-10(2019) - Standard Practice for Constant-Amplitude, Axial, Tension-Tension Cyclic Fatigue of Advanced Ceramics at Ambient Temperatures
Effective Date
10-Oct-2002

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ASTM E337-02 - Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)ASTM E337-02 - Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
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ASTM E337-02 - Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E337 –02
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. 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-
D861 Practice for Use of the Tex System to Designate
certainties in the relative humidity are expressed in the form
Linear Density of Fibers, Yarn Intermediates, and Yarns
RH 6 rh%,whichmeansthattherelativehumidityisexpected
D1193 Specification for Reagent Water
to lie in the range (RH − rh)% to (RH + rh )%, where RH is
D1356 Terminology Relating to Sampling andAnalysis of
theobservedrelativehumidity.Alluncertaintiesareatthe95%
Atmospheres
confidence level.
D1357 Practice for Planning the Sampling of theAmbient
1.2 Method A—Psychrometer Ventilated by Aspiration:
Atmosphere
1.2.1 This method incorporates the psychrometer ventilated
D3631 Test Methods for Measuring Surface Atmospheric
by aspiration. The aspirated psychrometer is more accurate
Pressure
than the sling (whirling) psychrometer (see Method B), and it
D4230 Test Method of Measuring Humidity with Cooled-
offers advantages in regard to the space which it requires, the
Surface Condensation (Dew-Point) Hygrometer
possibility of using alternative types of thermometers (for
E1 Specification for ASTM Thermometers
example, electrical), easier shielding of thermometer bulbs
E380 Practice for Use of the International System of Units
from extraneous radiation, accidental breakage, and conve-
(SI) (the Modernized Metric System)
nience.
1.2.2 Thismethodisapplicablewithintheambienttempera-
3. Terminology
ture range 5 to 80°C, wet-bulb temperatures not lower than
3.1 Definitions:
1°C, and restricted to ambient pressures not differing from
3.1.1 For definitions of humidity terms used in this test
standard atmospheric pressure by more than 30%.
method, refer to Terminology D4023.
1.3 Method B—Psychrometer Ventilated by Whirling (Sling
3.1.2 Fordefinitionsofothertermsinthistestmethod,refer
Psychrometer):
to Terminology D1356.
1.3.1 This method incorporates the psychrometer ventilated
3.2 Definitions of Terms Specific to This Standard:
by whirling (sling psychrometer).
1 2
This test method is under the jurisdiction of ASTM Committee D22 on Air For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Quality and is the direct responsibility of Subcommittee D22.11 on Meteorology. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Oct. 10, 2002. Published December 2002. Originally Standards volume information, refer to the standard’s Document Summary page on
e1
published as E 337 – 31 T. Last previous edition E 337 –84(96) . the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E337 –02
3.2.1 Method A—Aspirated Psychrometer: METHOD A—PSYCHROMETER VENTILATED
3.2.1.1 aspiration—The wet and dry bulbs (and the psy- BYASPIRATION
chrometer) are described as aspirated because there is provi-
sionfortheforcedventilationbydrawingairoverthebulbsby 6. Interferences
suction. The flow may be either transverse or parallel to the
6.1 When an aspirated psychrometer is used for measure-
axes of the bulbs.
ments in a small enclosed space
...

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5.1 This test method may be used for the determination of calcium, magnesium, potassium, and sodium in atmospheric wet deposition samples.  
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Range Tested
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0.009  
0.03–3.00  
0.168–2.939  
Magnesium  
0.003  
0.01–1.00  
0.039–0.682  
Potassium  
0.003  
0.01–1.00  
0.029–0.499  
Sodium  
0.003  
0.01–2.00  
0.105–1.84  
1.3 The method detection limit (MDL) as given in 1.2 is based on single operator precision. Detection limits vary by instrumentation. Laboratories may be able to achieve lower detection limits. The method detection limit for this method as described in 1.2 was determined in 1987 (2) .  
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 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. Specific warning statements are given in 8.3, 8.7, 12.1.8, and Section 9.  
1.6 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.

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ASTM
ASTM D4230-20(Test Method)
Standard Test Method for Measuring Humidity with Cooled-Surface Condensation (Dew-Point) Hygrometer

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.
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.

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