Multilayer ceramic NOx gas sensor device

A gas sensor element for detecting the concentration of two or more gas constituents in an exhaust gas, the sensor element comprising:

• a multilayer ceramic sensor body including a first sensing electrode placed on an outside surface of the body, and a second sensing electrode placed on an outside surface of the body, wherein at least one of the first and second sensing electrodes is a potentiometric sensing electrode for sensing a gas other than oxygen, and wherein the first and second sensing electrodes are configured to interact with an exhaust gas independently of each other;
• a metallic shared air reference electrode;
• a first heater element integrated into the ceramic body;
• a second heater element integrated into the ceramic body, the first and second heater elements being placed and adapted to create first and second temperature zones associated with the first and second sensing electrodes, respectively.

A gas sensor element for detecting the concentration of a gas constituent in an exhaust gas, the sensor element comprising:

• a sensor body including a first sensing electrode that generates a voltage signal measured potentiometrically, that is a function of the concentration of a first gas constituent being measured, said first gas constituent comprising NO or NO2;
• a second sensing electrode that generates a voltage signal that is a function of the concentration of a second gas constituent being measured, wherein the first and second sensing electrodes are configured to interact with said first and second gas constituents independently of each other;
• a first heater element integrated into the ceramic body;
• and
• a second heater element integrated into the ceramic body, the first and second heater elements being placed and adapted to create first and second temperature zones.