METHOD AT DETECTION OF PRESENCE OF HYDROGEN GAS AND MEASUREMENT OF CONTENT OF HYDROGEN GAS

The present invention relates to a method at detection of presence of hydrogen gas and measurement of content of hydrogen gas. The detection is performed by means of a hydrogen gas sensitive semiconductor sensor, whose output signal is used for determination of the content of hydrogen gas in the gas sample. The semiconductor sensor is exposed to the gas sample during a detection interval, which is preceded by a time interval during which the semiconductor sensor is exposed to a surrounding gas atmosphere. The invention is characterized in that the gas atmosphere contains a negligible amount of oxygen and carbon monoxide compared to the gas sample and that the time interval is many times longer than the detection interval.