Sensing and Controlling Humidity

In the energy control business it is usually necessary to monitor humidity, as well as temperature. Sensing humidity cannot be done as easily or as accurately as temperature sensing. For example, a temperature sensor in outside air will provide dependable service for the life of the mechanical equipment. A humidity sensor in outside air that must withstand temperatures from -20° to 100°F, as well as all sorts of pollution, may give dependable readings for only six months before it is destroyed or requires service. Outdoor humidity sensors require protection from the elements. Although a shield provides protection, an aspirated enclosure may provide the best solution.