Method of manufacture of an electric humidity detecting sensing

Details Method of manufacture of an electric humidity detecting sensing Method of manufacture of an electric humidity detecting sensing

1981-12-01

1984-04-10

Douglas, Winston A.

Chemistry: electrical and wave energy

Processes and products

73335, 204 37R, 204 38A, 338 35, C25D 1118, G01N 2556

Patent

active

044419686

ABSTRACT:
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.degree. to 110.degree. 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.

REFERENCES:
patent: 3075385 (1963-01-01), Stover
patent: 3406106 (1968-10-01), Garwood et al.
patent: 3523244 (1970-08-01), Goodman et al.
patent: 3861031 (1975-01-01), Furuichi
patent: 3987676 (1976-10-01), Bennewitz

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