Method for determining the concentration of a gas with an electrochemical gas sensor

Method for determining the concentration of a gas with an electrochemical gas sensor having at least one measuring electrode, at least a counter electrode and at least one reference electrode disposed in an electrolyte with a selectively acting for the gas to be determined reagent or mediator, comprising at least the following steps: - Start-up of the gas sensor in an amperometric mode and operational until a steady state is reached, - interrupting the power supply of the measuring electrode, - measurement of the potential at the measuring electrode, - re-recording of the voltage supply of the measuring electrode when a signal derived from the measurement of the potential at the measurement electrode on criterion is fulfilled, - Determination of the effluent after the resumption of the power supply of the measuring electrode charge and - allocation of one of the leaked charge corresponding concentration of the gas to be determined.