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ASTM E 337 Document Information:
Title
Standard Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
ASTM International
Publication Date:
Oct 10, 2002
Scope:
General:
This test method covers the determination of the humidity of
atmospheric air by means of wet- and dry-bulb temperature
readings.
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.
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.
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.
Method A—Psychrometer Ventilated by Aspiration:
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.
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 %.
Method B—Psychrometer Ventilated by Whirling (Sling
Psychrometer):
This method incorporates the psychrometer ventilated by whirling
(sling psychrometer).
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 %.
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
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