Humidity sensor with negative coefficient of resistivity for...

Details Humidity sensor with negative coefficient of resistivity for... Humidity sensor with negative coefficient of resistivity for...

G - Physics

01

N

150/7, 73/71, 32

G01N 27/02 (2006.01) G01N 27/12 (2006.01)

Patent

CA 1044915

ABSTRACT OF THE DISCLOSURE 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 (Fe2O3) and 0.01 to 90 mole percent of at least one member selected from alkali metal oxides, which are lithium oxide (Li2O), sodium oxide (Na2O), potassium oxide (K2O) and cesium oxide (Cs2O). The amount of the alkali metal oxide in the sensor is preferably 0.01 to 25 mole percent. This sensor is ad- vantageous because it can accurately detect the changes in humidity and it has a long, stable life.

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