Patent ID: 6367309
Filing Date: 2002-04-09
Classification: G01N

Abstract:
A sensor for measuring an oxygen concentration in a gas mixture, said sensor comprisingsensor means for generating a detection voltage (UD) depending on said oxygen concentration in said gas mixture; a heating device (50) associated with said sensor means; and an insulation layer (60) in which said heating device is arranged, said insulation layer (60) being made by a method comprising the steps of: a) providing an insulation base material consisting of a homogeneous mixture of aluminum oxide and at least one flux ingredient, wherein said at least one flux ingredient is selected from the group consisting of barium oxide, strontium oxide, compounds that generate barium oxide by thermal decomposition and compounds that generate strontium oxide by thermal decomposition, and wherein said insulation base material is silicate-free; b) applying said insulation base material to said heating device (50) to coat the heating device (50); and c) heating said heating device (50) with said insulation base material applied thereto to a temperature of approximately 1350Â° to 1600Â° C. to sinter said insulation base material and thus form the insulation layer (60) on the heating device (50).