Oxygen sensor for monitoring exhaust gases

Measuring and testing – Gas analysis – By vibration

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338 34, 422 98, G01N 2712

Patent

active

043511821

ABSTRACT:
A sensor measuring the partial oxygen pressure in furnace exhaust gas has an active layer of palladium. When the sensor is maintained at a particular temperature, for example about 700.degree. C., the palladium changes to palladium oxide at a specific air number, namely 1.2. The change from palladium to palladium oxide and vice versa causes a change in conductivity by a factor of approximately 20. This change in conductivity is a clearly defined output signal which can be adjusted to occur at any desired air number in the region from 1.05-1.4, depending upon the temperature at which the sensor is maintained. Two sensors may be used, each maintained at a different temperature so that a control region is defined as the air number region wherein the sensor maintained at the lower temperature is oxidized while the second sensor is reduced. Preferably, the active layer consists not only of the metal oxide but also of a ceramic component such as cerium oxide which is doped with 0.5-10% by volume of Nb.sub.2 O.sub.5 or Ta.sub.2 O.sub.5.

REFERENCES:
patent: 3340014 (1967-09-01), Neal et al.
patent: 3426579 (1969-02-01), Lebel et al.
patent: 3865550 (1975-02-01), Bott et al.
patent: 4193965 (1980-03-01), Cullingford et al.

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