A gas chromatograph for analyzing a gas mixture comprising: - at least one separation column (4, 6) for separating components of a sample of the gas mixture which is fed through the separation column (4, 6) by a carrier gas; - a thermal conductivity detector (5, 7) which has a sensing element (5', 7') arranged downstream from the separation column (4, 6) and having a first operating temperature, which thermal conductivity detector (5, 7) further is adapted to detect the separated components in a non-destructive manner and to generate a detector signal (S5, S7) in response to each of the detected components; - at least one further thermal conductivity detector (11, 12) which has a further sensing element (11', 12') arranged downstream or upstream from the thermal conductivity detector (5, 7) and which is adapted to detect separated components and to generate a further detector signal (S11, S12) in response to each of the detected components and - an evaluation unit for evaluating the detector signals (S5, S7) and further detector signals (S11, S12) to determine the concentrations of the detected components; characterized in that - the at least one further thermal conductivity detector (11, 12) is arranged immediately downstream or upstream from the thermal conductivity detector (5, 7) to detect the same separated components as the thermal conductivity detector (5, 7) and has a second operating temperature different from said first operating temperature; - the thermal conductivity detector (5, 7) and the at least one further thermal conductivity detector (11, 12) are calibrated for different concentration ranges; and - the evaluation unit is further adapted to compare for an actually detected component the detector signal (S5, S7) with the further detector signal (S11, S12) to determine in which of the different concentration ranges the concentration of the actually detected component is and to output a concentration value determined from the signal of the thermal conductivity detector that is calibrated for the concentration of the component measured. - at least one separation column (4, 6) for separating components of a sample of the gas mixture which is fed through the separation column (4, 6) by a carrier gas; - a thermal conductivity detector (5, 7) which has a sensing element (5', 7') arranged downstream from the separation column (4, 6) and having a first operating temperature, which thermal conductivity detector (5, 7) further is adapted to detect the separated components in a non-destructive manner and to generate a detector signal (S5, S7) in response to each of the detected components; - at least one further thermal conductivity detector (11, 12) which has a further sensing element (11', 12') arranged downstream or upstream from the thermal conductivity detector (5, 7) and which is adapted to detect separated components and to generate a further detector signal (S11, S12) in response to each of the detected components and - an evaluation unit for evaluating the detector signals (S5, S7) and further detector signals (S11, S12) to determine the concentrations of the detected components; - the at least one further thermal conductivity detector (11, 12) is arranged immediately downstream or upstream from the thermal conductivity detector (5, 7) to detect the same separated components as the thermal conductivity detector (5, 7) and has a second operating temperature different from said first operating temperature; - the thermal conductivity detector (5, 7) and the at least one further thermal conductivity detector (11, 12) are calibrated for different concentration ranges; and - the evaluation unit is further adapted to compare for an actually detected component the detector signal (S5, S7) with the further detector signal (S11, S12) to determine in which of the different concentration ranges the concentration of the actually detected component is and to output a concentration value determined from the signal of the thermal conductivity detector that is calibrated for the concentration of the component measured.