Apparatus combining spectrophotometry and flame ionisation detection for analysing a gas composition

Apparatus combining spectrophotometry and the detection of the ionization of a flame for analyzing a gas composition, said apparatus including a tubular burner comprising at least one nozzle for continuously admitting a gas sample to be analyzed, and coaxially to this nozzle:

• a first tubular sleeve having a bottom traversed by said nozzle, this sleeve successively delimiting with said nozzle an annular chamber used for admitting a combustive gas, such as hydrogen originating from a source, then a first combustion chamber extending beyond the extremity of the nozzle,
• a second tubular sleeve having a bottom through which said nozzle passes, this second sleeve successively delimiting with the first sleeve an annular chamber for admitting an oxidizing gas, such as air, and a second combustion chamber, which extends beyond the extremity of the first tubular sleeve, this second tubular sleeve including an orifice for removing the gases originating from combustion,
• first and second electrodes electrically connected to a circuit for measuring the conductivity of a combustion zone located in the second chamber, wherein said first electrode comprises the first tubular element, and wherein said second electrode comprises an annular electrode rendered integral with the second tubular sleeve so as to encircle, at least partially, the second combustion chamber,
• focusing optics coaxial to each of the sleeves and designed to focus the image of the flame generated in at least the first combustion chamber on the input orifice of a spectrophotometric mounting,
• said apparatus further including a processor able to process the data delivered by the measurement circuit and/or the spectrophotometric mounting so as to deduce therefrom the composition and the concentration of the searched elements of the sample.