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9 (00.4.1)
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Psychrometer construction for performance testing in temperature and humidity chambers, and the precision of humidity measurements -Meeting the challenge of quality engineering- |
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Abstract
When measuring the performance of the temperature and humidity chamber,
industrial standards have adopted the psychrometer (performance testing
psychrometer) as the standard humidity sensor. However, the standards do not discuss
the construction of the psychrometer itself, prescribing only the psychrometer equation
and the psychrometer coefficient to be used. Due to the improvement of humidity
measurement technology and the development of traceability systems in recent years,
we have again taken up the challenge of verifying psychrometer construction and
humidity measurement precision.
This report will also introduce quality engineering methods that we have applied
experimentally, as well as the methods we have used. |
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7 (99.3.31)
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Humidity measurement and psychrometers in environmental testing equipment
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Abstract
The use of psychrometers to measure humidity in environmental testing
equipment is practically universal. No other thermometers are available that can
stand up as well to the severe usage conditions of environmental testing equipment.
While some features need to be improved, the construction of the psychrometers is
simpler and more reliable than any other type of humidity sensor. Because of this, we
discuss features of psychrometers such as construction, working principles, precision,
factors of error, reliability, and points for caution in use. We also mention various
related standards. Finally, we also examine functions required for humidity
measurement in environmental equipment and future trends. |
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