| 摘要 |
The invention relates to a method and an apparatus for measuring the concentration of a gas mixture constituent in a flowing gas mixture, in particular for determining the H2S content in a biogas using an electrochemical sensor (ECS) which detects the gas mixture constituent, said method having the following method steps: a) a gas mixture volume to be detected, preferably a static gas mixture volume, is kept at a predetermined pressure, b) a preferably permanent carrier gas stream is produced from a carrier gas which is not contained in the gas mixture constituent to be detected, c) a gas type flow is produced in a gas line with alternating separate gas type volumes, which are delimited by phase boundaries, by introducing at least one gas mixture volume of a predetermined size into the carrier gas stream, d) the gas type flow is applied to the electrochemical sensor and at least one preliminary measured value below the measured value corresponding to the actual concentration of the gas mixture constituent is determined, the preliminary measured value is used in a measured value conversion device in which the actual concentration of the gas mixture constituent is determined by means of back-calculation on the basis of calibration values and is preferably displayed. |
