Helium Carrier Gas Conserving Inlet for Gas Chromatography Edward B. McCauley, P. Magni, M. Santoro, S. Pelagatti Thermo Fisher Scientific, Milan, Italy FIGURE 1. TRACE 1300 Series GC modularity with user-installable modules. Previously, split/splitless injectors used a single gas as a carrier, for septum purge, and for sample split. Usually,