Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – Including titration
Patent
1997-03-20
1999-12-28
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
Including titration
204402, 204425, 204426, 205784, G01N 27407
Patent
active
060076976
ABSTRACT:
A sensor cleaning method and a detection apparatus enabling easy and correct measurement for an uninterrupted prolonged time duration of the gas concentration.
The method is based on the value of a limiting current generated on applying a dc voltage across a pair of positive and negative electrodes of a sensor in which the electrodes are formed of a porous material and arranged in intimate contact with the surface of a solid electrolyte substrate exhibiting oxygen ion conductivity and in which pores of the negative electrode are used simultaneously as gas diffusion limiting holes for limiting the amount of diffusion of the gas for measurement. If the limiting current characteristics of sensor versus applied voltage are deteriorated, a voltage opposite to that used during measurement is applied for restoring the characteristics to a normal value.
REFERENCES:
patent: Re28792 (1976-04-01), Ruka et al.
patent: 2805191 (1957-09-01), Hersch
patent: 4950378 (1990-08-01), Nagata
patent: 5281314 (1994-01-01), Yagi et al.
patent: 5348630 (1994-09-01), Yagi et al.
patent: 5496461 (1996-03-01), Hotzel et al.
Horii Katsuhiko
Yagi Hideaki
NGK Spark Plug Co. Ltd.
Tung T.
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