Patent ID: 7406854
Filing Date: 2008-08-05
Classification: G01N

Abstract:
1. A gas sensor, comprising: a measuring element, which generates a measured signal that depends on the concentration of a measured gas; a cylindrical cap to delimit the gas sensor from the environment, said cylindrical cap having a top wall and a side wall made of a porous, gas-permeable and water-impermeable material, whereby gas passes through said top wall in an axial direction and gas passes through said side wall in a radial direction, said top wall and said side wall having a surface exposed to the environment; and a calibrating adapter having a gas admission pipe connection for supplying a calibrating gas to the cap of the gas sensor, said calibrating adapter being attached to or screwed on the cap, said cap having a smaller layer thickness and/or a higher porosity in an area of the gas admission pipe connection than in a remaining area.