Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound
Patent
1995-04-05
1997-11-04
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For oxygen or oxygen containing compound
204424, 204427, 2057835, 205787, G01N 27409
Patent
active
056835701
ABSTRACT:
A method is provided for measuring the concentration of a sample gas in an oxygen-containing carrier gas by continuously flowing the oxygen-containing carrier gas which also contains the sample gas whose concentration is to be measured, into and through a central, solid electrolyte inner detector tube, having a particular configuration to eliminate back-diffusion of air thereinto, the inner detector tube having an internal electrode, provided with a first, electrically-conductive output lead, in contact with its interior surface, and an external electrode, provided with a second, electrically-conductive output lead, in contact with its external surface. This bathes a first interface comprising the internal electrode and the interior of the inner detector tube with only the continuously flowing oxygen-containing carrier gas, at a predetermined temperature. A reference gas is also continuously flowed into the annulus between the inner detector tube and an outer, concentric non-porous tube, having a particular configuration to eliminate back-diffusion of air into such annulus. This bathes a second interface comprising the external electrode and the exterior of the inner detector tube with only the continuously flowing reference gas, at that temperature. The carrier gas and the reference gas are prevented from intermingling by a particular structural relationship. An electrical signal is generated between the electrodes, the electrical signal being directly proportional to the concentration of the sample gas to be determined. The so-generated electrical signal is measured to determine the concentration of the sample gas as a linear correlation of the electrical signal.
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E. Hafele, K. Kaltenmaier and U. Schonauer; Application of the ZrO.sub.2 Sensor Determination of Pollutant Gases; 1991.
Furue Hiroshi
Pacey Philip D.
Dalhousie University
Tung T.
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