Abstract: An electrochemical gas sensor is provided. The electrochemical gas sensor has a housing divided in a transverse direction by a partition extending in a height direction of the housing into a housing inner area and a housing outer area, a measuring electrode, a reference electrode, and a hydrophilic membrane. The measuring electrode and the hydrophilic membrane are disposed in the housing inner area. The hydrophilic membrane has a membrane arm for receiving the reference electrode. The membrane arm extends from the housing inner area into the housing outer area so that the reference electrode is disposed in the housing outer area.

Abstract: A gas measuring device (100) measures cyanogen in the presence of hydrogen cyanide. The gas measuring device (100) includes a measuring chamber (101), a heating element (103, 203) and an electrochemical sensor (105, 200). The measuring chamber (101) is configured to receive a sample. The heating element (103) is configured to thermally decompose cyanogen contained in the sample into decomposition products. The sensor (105, 200) is configured to detect the decomposition products of cyanogen, which are obtained by the thermal decomposition. A process measures cyanogen in the presence of hydrogen cyanide.