Robert Boschgmbh

Manfred Schonborn

Horst Jahnke

Georg Zimmermann

Horst Magenau

Brigitte Moro

Hans Siebke

Brunhilde Becker

Control system and apparatus for measuring and monitoring the nitrogen oxides content of internal combustion engine exhaust gases. The exhaust gases are contacted with the reducing electrode of a sensor cell having a predetermined potential established between the cell electrodes so that the reducing electrode is able to reduce both the nitrogen oxides and oxygen content of the exhaust gas. The current flowing through the sensor cell is measured to determine whether the nitrogen oxides content of the exhaust gas is sufficiently low.

Controls for maintaining low nitrogen oxides content in internal

A stable oxygen electrode which is in an active state and retains said activity for a long service life. The electrode comprises an electrode carrier and an activated transition metal chelate of 5,14-dihydrodibenzo(5,9,14,18)tetraaza(14)annulene. Said metal chelate is activated by heating in an inner gas atmosphere at a temperature of between about 600.degree. and 1000.degree.C for at least 5 minutes.

Activated stable oxygen electrode

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Gerlingen, Germany

Manfred Schonborn