Abstract
Humidity‐sensing characteristics in wet air of a gas polarographic oxygen sensor using a zirconia electrolyte have been investigated. This oxygen sensor showed two limiting current plateaus in wet air by analogy with the polarographic process, compared to one limiting current plateau in dry air. The first limiting current was approximately proportional to the oxygen concentration in the atmosphere. On the contrary, the second limiting current was related to the fact that oxygen ions, produced by the electrochemical decomposition of water vapor at the cathode of the sensor, passed through the zirconia electrolyte. As a result, the difference between the second and the first limiting currents increased with water vapor concentration in the ambient atmosphere. Thus, this oxygen sensor can be also used for detecting humidity in wet air.
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