Polarographic oxygen sensor, particularly for combustion exhaust

Details Polarographic oxygen sensor, particularly for combustion exhaust Polarographic oxygen sensor, particularly for combustion exhaust

1987-11-03

1989-06-27

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204424, 204425, 204427, G01N 2746

Patent

active

048427136

ABSTRACT:
To accurately control access of measuring gas into the measuring electrode (15) of a polarographic sensor having a tubular body (12) of solid electrolyte material, the tubular body is enclosed within a protective sleeve (38) closed at one end and embodying a diffusion resistance element, or diffusion resistance zone (43/1, 43/2); if the sleeve is of metal, a separate diffusion resistance element, for example, made of aluminum oxide or spinell may be used; if the sleeve is made of ceramic, the end portion may be thickened and the diffusion resistance zone formed therein, for example, by micropores or microchannels or microducts extending therethrough.

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EPO Official Action Apr. 19, 1988 and allowed main claim, in EP84 116232.

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