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Polyimide Capacitive Humidity Sensors
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The need for a full-range, low cast humidity sensor has led Honeywell to develop a capacitive relative humidity (RH) sensor with resistance to environmental contaminants. The sensor is used in a bridge circuit to give either a voltage or a current output. In our application, the bridge circuit also has a temperature sensor and is used to sense the enthalpy of outdoor air for an economizer cooling cycle.
Lofgren, H.; Mills, F. (1988). Polyimide Capacitive Humidity Sensors. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from