Patent ID: 6940287

Claim:
An unheated planar sensor element for determining a concentration of a gas component in a gas mixture, comprising: a first sensor foil composed of a solid electrolyte; a reference-gas channel; a first outer electrode situated on an outer side of the first sensor foil, the first outer electrode being exposed to the gas mixture; a first inner electrode situated on an inner side of the first sensor foil, the first inner electrode being exposed to a reference gas, the first inner electrode being situated inside the reference-gas channel covered on top by the first sensor foil; a second sensor foil covering an underside of the reference-gas channel, the second sensor foil being composed of a solid electrolyte; a second inner electrode situated on an inner side of the second sensor foil, the second inner electrode being situated inside the reference-gas channel; and a second outer electrode situated on an outer side of the second sensor foil, the second outer electrode being exposed to the gas mixture.