ASTM-E337 2002

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

Published By	Publication Date	Number of Pages
ASTM	2002	24

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Description

ASTM E337-02

Historical Standard: Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)

ASTM E337

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.)

Keywords

aspiration; humidity; psychrometer; psychrometric table; temperature; vapor pressure; ventilation; wet-bulb temperature

ICS Code

ICS Number Code 07.060 (Geology. Meteorology. Hydrology)

DOI: 10.1520/E0337-02

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Methods Significance and Use Interferences Apparatus
3	Precautions
4	Calibration Procedure Calculation
5	Precision and Bias Interferences Apparatus Precautions TABLE 1
6	Calibration Procedure Calculation —(See Section .) Precision and Bias Keywords A1. MERCURY-IN-GLASS THERMOMETERS SUITABLE WHEN THE UNCERTAINTY IN THE MEASURED RELATIVE HUMIDITY IS REQUIRED NOT TO EXCEED 3 % RH A1.1 TABLE 2
7	A2. DETERMINATION OF THE DISTANCE FOR WHICH THE WET-BULB COVERING MUST EXTEND ONTO THE THERMOMETER STEM TO LIMIT THE HEAT-CONDUCTION ERROR TO 0.05°C A2.1 A2.2 A2.3 A2.4 A2.5 A2.6
8	X1. SKELETON TABLE OF RELATIVE HUMIDITIES X1.1 TABLE X1.1
9	X2. SATURATION VAPOR PRESSURE OVER WATER X2.1 TABLE X2.1
11	X3. RELATIVE HUMIDITY—PSYCHROMETRIC TABLE X3.1 TABLE X3.1
22	X4. FACTORS (B) X4.1 X4.2
23	X5. PRESSURE CONVERSION FACTORS X5.1 REFERENCES TABLE X4.1

Additional information

Standard Title	E337-02 Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
Published Code	ASTM
Publication Date	2002
Pages Count	24