ABSTRACT
The sensitivity and the resistance of ceramic humidity sensors depend on the structure of their pores. Ceramic humidity sensors can be classified according to different symptoms: the physical quantity function of humidity, the mechanism of electrical conductivity, the electrical properties of the ceramics, etc. The characteristics of these sensors allow for their implementation as key elements for restricting humidity. According to the physical quantity function of humidity there are resistive, capacitance, and current ceramic sensors. The sensors which have been described have a comparatively low resistance at low humidities. The application of humidity sensors in reality has imposed a more pragmatic method for defining and determining the response time. The temperature range over which a given sensor material can be used to measure humidity is specified for any of these materials. The parameters which determine this range are the stability of the material, the operating principle of the sensor, and its sensitivity.
