Set of three devices that allow the physical and chemical separation of gases and/or liquids in which measures are obtained from the thermal conductivity of the sample. One is equipped with a flame photometric and thermal conductivity detector, and a HP3365 data processing station. The second is equipped with thermal conductivity detector, with Poraplot Q and Molecular Sieve columns, and an HP3365 data processing station. The third is equipped with an HP5971 selective mass detector and is fitted with an ATD 400 PerkinElmer thermal desorber .