Apparatus for collecting fractions separated by gas-chromatography

... 1,010,767. Automatically collecting gas chromatography fractions. IMPERIAL CHEMICAL INDUSTRIES Ltd. Jan. 8, 1964 [Jan. 29, 1963], No. 3627/63. Heading B1L. An apparatus for collecting gas chromatography fractions comprises a detector which feeds signals to a recorder to give a chromatogram, a two position switch actuated by the recorder at any desired level rising or falling on the chromatogram. which switch is connected to another two position switch in such a way that an electric motor can be switched on or off by the first switch irrespective of the position of the second, the electric motor driving a multi-station stop-dwell-go mechanism which is connected to a rotary valve assembly having a stationary upper face with an inlet port leading to the discharge end of the detector and a lower rotating member having a plurality of exit ports which are aligned sequentially and automatically by the apparatus with the inlet port according to the fractions which emerge from the column. In a specific ...