Method and device utilizing electrochemical sensor to measure gas strength

The invention provides a method and a device utilizing an electrochemical sensor to measure gas strength. A tested sample passes through the electrochemical sensor at least twice in sequence, one time is for detecting the zero point of the sensor and recording the response current value of each time of measurement; and the measurement equation relation between the current value measured by the electrochemical sensor at each time and the concentration of the sample and the quality equation relation between the concentration change caused by electrolysis and the consumed electrical quantity form a simultaneous set to solve the concentration of the tested sample and the calibration parameters of the sensor.