Patent ID: 8758698

Claim:
A combustion tube for receiving a sample for combustion thereof to form combustion products, the combustion tube comprising: a primary combustion chamber for receiving a sample for combustion thereof to form first combustion products; and a secondary combustion chamber for receiving the first combustion products for further combustion thereof to form second combustion products, the secondary chamber being disposed around the primary chamber and comprising a plurality of combustion compartments, each successive combustion compartment being disposed around the preceding combustion compartment and each combustion compartment defining a respective elongate and substantially annular gas flow channel having an inlet opening at one end and an outlet opening at the opposite end, wherein each successive as flow channel shares its inlet opening with the outlet opening of the preceding channel; wherein each respective combustion compartment comprises a longitudinal sidewall and each combustion compartment comprises a respective first static gas mixer fixed to the respective sidewall for effecting mixing of gases during their flow through the combustion tube, each first static gas mixer comprising a respective plurality of ribs fixed on the respective sidewall within the respective combustion compartment and formed in accordance with either a positive or a negative screw direction, wherein one or more of the combustion compartments further comprises a second static gas mixer fixed to the respective combustion compartment sidewall, the second static gas mixer comprising another plurality of ribs fixed on the sidewall of the respective combustion compartment and formed in accordance with a screw direction that is opposite to the screw direction associated with the first static gas mixer within the same respective combustion compartment.