Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1987-01-30
1988-08-09
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204410, 204425, G01N 2758
Patent
active
047626054
ABSTRACT:
A limited current type oxygen sensor comprises a solid electrolyte element formed from material having high oxygen-ion conductivity such as yittria-stabilized zirconia. Electrodes are provided on the top surface and the bottom surface of the element and are formed by calcining a mixture of small ceramic particles that are relatively sinter-retardant as compared with oxygen-ion conducting ceramics, of 200 .ANG. in average particle size fine precious metal particles, and a binder. A cover is provided over the second electrode and the cover includes at least one diffusion orifice that permits ambient gas to diffuse toward the second electrode. The dry-gas-based and humid-gas-based oxygen content of the gas is determined by applying a first voltage less than the theoretical water decomposition voltage and a second voltage greater than the theoretical water decomposition voltage to the electrodes to generate corresponding currents associated with the oxygen-ions which flow through the electrolyte element between the first electrode and the second electrode. A heater may be buried in the electrolyte element to increase the flow rate of oxygen ions between the electrodes.
REFERENCES:
patent: 3514377 (1970-05-01), Spacil et al.
patent: 4547281 (1985-10-01), Wang et al.
patent: 4601809 (1986-07-01), Kitahara
Masuda Masahiko
Shiraishi Hideo
Sugimoto Keisuke
Sugiyama Yuji
Takahama Teizo
Fuji Electric & Co., Ltd.
Kaplan G. L.
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