Patent ID: 7998327

Claim:
A measuring sensor for determining a physical property of a measured gas, comprising: a sensor element capable of being exposed to the measured gas, the sensor element includes a ceramic element made of solid electrolyte layers, an outer electrode situated on a surface of the ceramic element, and a porous protective lining coating the outer electrode; a protective layer at least partially coating the sensor element, the protective layer protecting against a harmful component in the measured gas, the protective layer covering the porous protective lining, wherein the protective layer includes one of highly active γ-aluminum oxide (Al 2 O 3 ) and highly active δ-aluminum oxide (Al 2 O 3 ), the aluminum oxides having additives of one of the alkaline metals group, the alkaline earth group, the IV B subgroup, and the lanthanides group, wherein a material of the protective lining includes zirconium oxide (ZrO 2 ) having a small proportion of aluminum oxide (Al 2 O 3 ), and wherein the protective layer has a substantially higher proportion of aluminum oxide than the protective lining; and a porous adhesive layer covering the protective lining, wherein a material of the adhesive layer includes zirconium oxide (ZrO 2 ) having a proportion of aluminum oxide (Al 2 O 3 ).