Module consisting of an electrochemical sensor and a hydrogen sulfide generator, in which the sensor and hydrogen sulfide generator cells are placed in a housing with the possibility of gas flow from the generator gas generating electrode to the sensor working electrode, which are separated from the environment by a gas-permeable hydrophilic membrane. Wherein, the electrochemical sensor and the hydrogen sulfide generator are placed in the same housing, in the same horizontal plane, and the possibility of gas flow from the gas generating electrode of the generator to the working electrode of the sensor is provided by a gas channel directed tangentially to the axes of the cells, while maintaining free access of the air environment to the working electrode of the sensor.