humidity indicator / card / portable / irreversible
Non-Reversible Delayed Response Maximum Humidity Indicator Discs
The TA378-HC-MHI marks a significant breakthrough in the monitoring of humidity inside long-term storage containers for sophisticated military/electronic and corrosion-susceptible equipment.
The element warns of dangerous humidity levels by staining a white disc a brilliant orange (turning later to a dark brown) when it has been exposed to humidity ranging from 55% RH for an eight hour continuous period to 85% RH for two hours. Humidity levels below 55% will not cause the indicator to stain, regardless of duration.
Unaffected by temperature, it gives an unmistakable indication of the need for desiccant replacement, regardless of when it is checked.
The element is designed to be installed into our standard housing at the time the container is desiccated. Installation is accomplished with a 0.50 in. (13 mm) hex key wrench.
Each element is individually packaged in a MIL-B-22191 transparent barrier bag with desiccant. Quantities are overpacked in sealed metal containers.