The present invention relates to an absorption gas analyzer for measuring a concentration of at least a component gas in a sample gas. The absorption gas analyzer comprises a main absorption cell (102) for containing the sample gas for measurement therein. At least a narrow band emitter (108) emits electromagnetic radiation in at least a predetermined narrow wavelength band which is transmitted through the main absorption cell (102). A reflecting device (110) is disposed for reflecting the electromagnetic radiation after transmission through the main absorption cell (102) such that the electromagnetic radiation is transmitted again therethrough. At least a detector (112) detect the electromagnetic radiation and provide at least an intensity signal in dependence upon the concentration of the at least a component gas. The absorption gas analyzer enables simultaneous determination of concentration of a plurality of individual component gases with a high level of accuracy.
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