Humidity sensor

Details Humidity sensor Humidity sensor

1975-12-24

1977-08-09

Padgett, Benjamin R.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

73 29, 73 73, 733365, 23253R, 252194, 252408, H01C 1300

Patent

active

040414370

ABSTRACT:
This invention provides a humidity sensor having a negative coefficient of resistivity for relative humidity, which comprises 99.99 to 10 mole percent of iron oxide (Fe.sub.2 O.sub.3) and 0.01 to 90 mole percent of at least one member selected from alkali metal oxides, which are lithium oxide (Li.sub.2 O), sodium oxide (Na.sub.2 O), potassium oxide (K.sub.2 O) and cesium oxide (Cs.sub.2 O). The amount of the alkali metal oxide in the sensor is preferably 0.01 to 25 mole percent. This sensor is advantageous because it can accurately detect the changes in humidity and it has a long, stable life.

REFERENCES:
patent: 3200167 (1965-08-01), Reich
patent: 3671913 (1972-06-01), Mamiya et al.
patent: 3715702 (1973-02-01), Nicholas
patent: 3870655 (1975-03-01), Nanba
Chemical Abstracts, vol. 70, (1969) No. 61495g.
Shibata et al., Bulletin of the Chem. Soc. of Japan, vol. 42, 1969, pp. 871-874.

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