Humidity indicator paper won't hide transients
A
Brownell product story
Edited by the Engineeringtalk editorial team
Oct 25, 2002
A new nonreversible humidity indicator paper avoids the risk of misleading readings and missed signals of a temporary but potentially damaging problem.
A new Brownell nonreversible humidity indicator paper avoids the risk of misleading readings and missed signals of a temporary but potentially damaging problem not shown by conventional indicator papers that change back to a clear reading when transient high humidity levels revert to normal.
The nonreversible indicator records the maximum humidity exposure by changing colour from orange to a distinct and permanent brown that is stable and not affected by exposure to the same humidity but changes to indicate a higher humidity level.
Increments of 10% relative humidity can be detected over a range of 50 to 90% RH.
These indicators are available in cards for installation into boxes and packages or in panel mounting housings for pipeline and enclosure monitoring applications.
Conventional paper indicates humidity by changing from 'dry' blue to 'wet' pink in a process that is fully reversible and most commonly used to signal when an adsorption agent is active or saturated.
It leaves no record of temporarily high relative humidity levels that often cause equipment failure or temporary malfunction caused by corrosion, condensation and icing.
Similarly, it does not indicate temporary malfunctions from water vapour condensing and causing an electrical short circuit or fogging of an optical instrument which subsequently 'clears' when the temperature change causes the humidity to change.
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