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Ahumidistat orhygrostat is anelectronic device analogous to athermostat but which responds torelative humidity, nottemperature. A typical humidistat is usually included with portable humidifiers or dehumidifiers. It can also be included with combined air cleaner or humidifier units to control a home's humidity level or any other indoor space.[1]
Humidistats are used in a number of devices includingdehumidifiers,humidifiers, andmicrowave ovens. In humidifiers and dehumidifiers, the humidistat is used where constant relative humidity conditions need to be maintained such as arefrigerator,greenhouse, orclimate-controlledwarehouse.[2] When adjusting the controls in these applications the humidistat would be what is being set. In microwaves they are used in conjunction withsmart cooking one-button features such as those formicrowave popcorn. Humidistats employhygrometers but are not the same. A humidistat has the functionality of aswitch and is not just ameasuring instrument like a hygrometer is.
Forheating, ventilation, and air conditioning (HVAC) of buildings, humidistats or humidity sensors are used to sense the air relative humidity in the controlled space and turn on and off the HVAC equipment.[3]
