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Gas analyser ??7000-TKV is designed for determination of hydrogen in nitrogen (H2+N2), hydrogen in air (H2+air), hydrogen in carbon dioxide (H2+CO2), helium in air (He+air), sulphur dioxide in nitrogen (SO2+N2), sulphur dioxide in air (SO2+air), carbon dioxide in nitrogen (CO2+N2), methane in nitrogen (CH4+N2), helium in nitrogen (He+N2), argon in nitrogen (Ar+N2), argon in hydrogen (Ar+H2), argon in air (Ar+air), argon in oxygen (Ar+O2), hydrogen in oxygen (H2+O2), oxygen in hydrogen (O2+H2), hydrogen in argon (H2+ Ar), helium in argon (Ne+Ar), hydrogen in hydrogen chloride (H2+ HCl), hydrogen in ammonia (H2+NH3), nitrogen in helium (N2+Ne). The principle of operation of the EN7000-TKN gas analysers is based on the thermoconductometric method of measurement.