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Accuracy and Linearity of Sling and Digital Psychrometers

Accuracy and Linearity of Sling and Digital Psychrometers
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Ambient conditions can be critical to the success or failure of a coatings project. It has generally been assumed by the industry that a sling psychrometer is more accurate in determining Relative Humidity and Dew Point than electronic sensors. 

Product Number: 41207-367-SG
Author: Phillip K. Parson, Tom Swan
Publication Date: 2007
Industry: Coatings
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$20.00
$20.00

Ambient conditions can be critical to the success or failure of a coatings project. It has generally been assumed by the industry that a sling psychrometer is more accurate in determining Relative Humidity and Dew Point than electronic sensors. While this may be true for meteorological sling psychrometers that meet the criteria of ASTM E337 “Measuring Humidity with a Psychrometer (the measurement of Wet- and DryBulb Temperatures)”, the sling psychrometers in use in most coating applications appear to lose accuracy as temperatures increase above 80F. In the 80F range and above, electronic sensors appear to provide much more consistent data. When “red spirit” thermometers are slung in these temperature ranges, the dry bulb temperature may vary by ± 10F or more from the reading observed prior to slinging it.

Ambient conditions can be critical to the success or failure of a coatings project. It has generally been assumed by the industry that a sling psychrometer is more accurate in determining Relative Humidity and Dew Point than electronic sensors. While this may be true for meteorological sling psychrometers that meet the criteria of ASTM E337 “Measuring Humidity with a Psychrometer (the measurement of Wet- and DryBulb Temperatures)”, the sling psychrometers in use in most coating applications appear to lose accuracy as temperatures increase above 80F. In the 80F range and above, electronic sensors appear to provide much more consistent data. When “red spirit” thermometers are slung in these temperature ranges, the dry bulb temperature may vary by ± 10F or more from the reading observed prior to slinging it.

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