Method of manufacture of an electric humidity detecting sensing element

摘要

Electric humidity detecting sensing element on the basis of a layer of porous aluminum oxide, treated by sealing in boiling water, passivation and tempering at 70 DEG to 110 DEG C., achieving thereby a substantial reduction of subsequent variations of calibrating curves. The time of tempering may range from 2 to 24 hours. A preferred average time of tempering is 8 hours, with a practical upper limit of 12 hours.