Humidity sensitive device

Details Humidity sensitive device Humidity sensitive device

1985-11-12

1986-06-10

Albritton, Clarence L.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

338 34, 324 65R, H01L 700

Patent

active

045945691

ABSTRACT:
A humidity sensitive device for sensing the humidity of an ambient humidity comprising a humidity sensitive resistor 15 which comprises as main component at least one selected from the group consisting of ZrO.sub.2, TiO.sub.2, Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 and an electric heater 13 applied near and for heating and retaining the humidity sensitive resistor 15 at a temperature above 200.degree. C. The humidity sensitive resistor 15 and a fixed resistor are series connected across an AC voltage source 17, and a voltage across the humidity sensitive resistor 15 or the fixed resistor 16 is rectified by a AC/DC converter and compared with a reference voltage by a comparator, thereby an output responding to humidity in the atmosphere can be measured for a wide range of temperature.

REFERENCES:
patent: 3478573 (1969-11-01), King et al.
patent: 3926858 (1975-12-01), Ichinose et al.
patent: 4011538 (1977-03-01), Froemel
patent: 4015230 (1977-03-01), Nitta et al.
patent: 4017820 (1977-04-01), Ross
patent: 4080564 (1978-03-01), Nitta et al.
patent: 4086556 (1978-04-01), Nitta et al.
patent: 4326414 (1982-04-01), Terada et al.
patent: 4378691 (1983-04-01), Terada et al.
patent: 4419021 (1983-12-01), Terada et al.

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