NOVELTY - Electrolysis system (2) comprises an electrolyzer (4) which is provided with an electrolytic membrane having an oxygen outlet and a hydrogen outlet, and a separator outlet (50) used for carrying out separation of liquid/gas. The separator outlet is provided with an inlet which is fixed to an outlet connected to the oxygen outlet and the hydrogen outlet of the electrolyzer. A measuring device (60) is connected to the outlet of the electrolyzer. The measuring device is connected to an inlet of the separator outlet for measuring the content of hydrogen and/or oxygen in the fluid.    USE - The electrolysis system is useful for producing oxygen and hydrogen by electrolysis of water (claimed).    ADVANTAGE - The electrolysis system comprising the electrolytic membrane guarantees sealing between the oxygen compartment and the hydrogen compartment.    DETAILED DESCRIPTION - Electrolysis system (2) comprises an electrolyzer (4) which is provided with an electrolytic membrane having an oxygen outlet and a hydrogen outlet, and a separator outlet (50) used for carrying out separation of liquid/gas. The separator outlet is provided with an inlet which is fixed to an outlet connected to the oxygen outlet and the hydrogen outlet of the electrolyzer. A measuring device (60) is connected to the outlet of the electrolyzer. The measuring device is connected to an inlet of the separator outlet for measuring the content of hydrogen and/or oxygen in the fluid. The outlet of the electrolyzer is provided with an upstream inlet of the separator outlet. An INDEPENDENT CLAIM is also included for controlling the operation of the electrolysis system, comprising measuring the content of oxygen and/or hydrogen in the fluid fed along upstream of the inlet of the separator outlet, and feeding into the inlet of the separator outlet.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of electrolysis system.    Electrolysis system (2)    Electrolyzer (4)    Separator outlet (50)    Measuring device (60)