Heraeus Electro-nite International N.v.

Roth-technik Gmbh & Co. Forschung Fur-automobil-und Umwelttechnik

Kernforschungszentrum Karlsruhe Gmbh

Roth-technik Gmbh & Co.

Forschung Fur Automobil- Und Umelttechnik

Roth-tecknik Gmbh & Co. Forschung Fur Automobil Und Umwelttechnik

Ulrich Schonauer

Karl-Heinz Hardtl

Edelbert Hafele

Michael Tafferner

Andreas Krug

Hagen Fischer

Peter Gerstel

Oxygen sensor for measuring resistance as a function of oxygen partial pressure, made of alkaline-earth-doped perovskitic lanthanum ferrites with the general formula

Oxygen sensors made of alkaline-earth-doped lanthanum ferrites and

The invention relates to a catalytic layer system on a resistive gas sensor, especially on a resistive gas sensor layer on a titanate base, with at least one first layer and a second layer lying over the first layer, where, according to the invention, the first layer exhibits a catalytically active substance whose volume percentage in the layer ranges from 20 to 80%. In addition, the first layer contains a titanate that corresponds to at least one titanate of the underlying gas sensor layer. This attribute guarantees favorable adhesion between the layers. Furthermore, an oxide mixture that contributes to the improved mechanical stability of the layer system is provided in the second layer instead of the catalytically active substance. To manufacture the catalytic layer system, the individual layers are applied to the sensor in a screen printing process, which allows for a rational method of production and the precise dosing and distribution of the individual layer components.

Catalytic layer system

Cover layer for electrical conductors or semiconductors

Oxygen sensors made of alkaline-earth-doped lanthanum ferrites

Electrically conducting connection

The invention concerns a device for continuously monitoring the level of at least one gaseous constituent in a mixture of gases. The drawbacks of the known devices are complexity, high power consumption, large size, and, due to their high mass, non-uniform distribution of temperature, entailing imprecise measurement, and inertia, especially at the commencement of operation. These drawbacks are eliminated with a base in the form of a water with at least two electrodes in the form of separated thin coatings and with a temperature sensor separated from the electrodes on one side and with a heater in the form of an electric-resistance heating coating on the other side.

Device for monitoring the concentration of gaseous constituents in

Manufacture of inert, catalytic or gas-sensitive ceramic layers for gas

Semiconductor for a resistive gas sensor having a high response speed

Growing community of inventors

Karlsruhe, Germany

Ulrich Schonauer