The elementary analyzers vario EL  and varia MICRO cube work according to the principle of catalytic tube combustion in an oxygenated atmosphere and high temperatures. The combustion gases are freed from foreign gases (for instance volatile halogen). The desired measuring components are separated from each other with the help of specific adsorption columns and determined in succession with a thermal conductivity detector (TCD). Helium (He) serves as flushing and carrier gas.