Patent ID: 7935234

Claim:
A planar electrochemical gas sensor, comprising: a working electrode; a counterelectrode; an electrolyte-filled, planar electrolyte carrier; a planar housing upper part with a planar surface; and a planar housing lower part with a planar surface, said working electrode and said counterelectrode being arranged such that they are in two-dimensional contact with the electrolyte carrier in a two-dimensional contact region, said housing upper part and said housing lower part being connected with one another by said planar surfaces such that said working electrode and said counterelectrode and said electrolyte carrier are pressed against one another by said planar surfaces such that they are secured against displacement, said planar surface of said housing upper part and said planar surface of said housing lower part being partially in two-dimensional direct physical contact with one another with a connection between said planar surfaces of said housing upper part and said housing lower part being present in a direct two-dimensional housing part contact region entirely along a closed figure, which surrounds said working electrode and said counter electrode and said electrolyte carrier; wherein said electrolyte in said electrolyte-filled electrolyte carrier has hygroscopic properties, said planar surfaces of said planar housing upper part and said planar housing lower part have elastically deformable areas which define a compensating volume and said electrolyte carrier has a plurality of indentations between said working electrode and counter electrode, said plurality of indentations of said electrolyte carrier also define said compensating volume.