Electrochemical gas sensor with nonplanar diffusion membrane and electrode array

The present invention pertains to an electrochemical gas sensor with at least two electrodes, a diffusion membrane and an electrolyte, and relates to a process for making same. An electrochemical gas sensor, which has a substantially more compact design and is manufactured with a considerably reduced manufacturing effort. A conical, calotte-shaped, hemispherical or cylindrical outer housing is provided with gas admission openings (). A cover () as well as a layer structure is provided with, from the outside to the inside, the diffusion membrane () with the electrodes () applied thereto in a planiform manner, a layer () consisting of a mat material or a porous body, which accommodates the electrolyte, and an electrolyte space (), which is filled at least partially with the electrolyte.