The combined Humidity Indicator and Relief Valve is designed to install in moisture sensitive instrument, such as electronic or electro-optic. It can also be used for other controlled humidity enclosure that is subjected to air transit. It needs only a single hole for installation; this is useful especially when equipment or containers have limited space.
The combined Humidity Indicator and Relief Valve monitor the changes in the moisture level/humidity and the change is indicated by a colour change in the indicative paper. If the humidity increases, the indicator paper turns from blue to pink, and turns back to blue when the humidity decreases.
Desiccant cartridges, like static desiccators, can be fitted in most of the units to remove moisture – ensuring only dry air enters the equipment.