Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1987-02-09
1988-02-02
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204406, 204412, 204425, 204426, G01N 2758
Patent
active
047227796
ABSTRACT:
An air/fuel ratio sensor having two units of probe is disclosed each of which comprises two sensing elements, each having a pair of porous electrodes on oppostie sides of an oxygen ion-conductive solid electrolyte; a gas compartment which is formed in contact with one porous electrode for each sensing element and which communicates with the gaseous atmosphere of interest by way of a gas diffusion limiting portion; and an internal reference oxygen source which is formed in contact with one sensing element on the porous electrode side which is opposite the side where said gas compartment is provided. The oxygen source communicates with the outside by way of a leakage resisting portion. The gas compartment in the first unit of probe communicates directly with the gaseous atmosphere of interest by way of a first gas diffusion limiting portion while the gas compartment in the second unit of probe communicates with the gas in the first unit of probe by way of a second gas diffusion limiting portion.
REFERENCES:
patent: 4578171 (1986-03-01), Yamada et al.
patent: 4594139 (1986-06-01), Asayama et al.
Hayakawa Nobuhiro
Hayashi Keiichi
Nakajima Toyohei
Okada Yasushi
Yamada Tetsusyo
Honda Giken Kogyo Kabushiki Kaisha
Kaplan G. L.
NGK Spark Plug Co. Ltd.
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