Chemistry: electrical and wave energy – Processes and products
Patent
1978-03-27
1979-12-04
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204195S, G01N 2758
Patent
active
041771125
ABSTRACT:
An oxygen concentration detector comprises an oxygen concentration sensor made of an oxygen ion conductive metal oxide which produces an electromotive force in accordance with a difference between an oxygen concentration in gas components of a gas under test and an oxygen concentration in a reference gas, an electrode formed on a surface of the oxygen concentration sensor which is to be exposed to the gas under test and an electrode formed on a surface of the oxygen concentration sensor which is to be exposed to the reference gas so that the electromotive force produced by the oxygen concentration sensor is taken across the electrodes, a first porous coating of a refractory metal oxide formed on the surface of the electrode which is to be exposed to the gas under test, said first coating having a number of pores through which the gas under test can pass, and a second porous coating of a refractory metal oxide formed on the surface of the first coating, said second coating having a number of pores which are larger than the pores of the first coating.
REFERENCES:
patent: 4019974 (1977-04-01), Weyl et al.
patent: 4021326 (1977-05-01), Pollner et al.
patent: 4097353 (1978-06-01), Kishida et al.
Nakamura Yasuo
Soda Kazuya
Suzuki Masatosi
Kaplan G. L.
Nippondenso Co. Ltd.
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