High pressure sample injector and injection method

Details High pressure sample injector and injection method High pressure sample injector and injection method

G - Physics

01

N

73/93

G01N 30/36 (2006.01) G01N 30/22 (2006.01)

Patent

CA 1045408

HIGH PRESSURE SAMPLE INJECTOR AND INJECTION METHOD Abstract of the Disclosure An injection apparatus and method for use in high pressure Liquid chromatography. A cylindrical sample holding means con- taining several sample cells is maintained in a chamber whose pressure is approximately equal to that of the head of the chromatograph separation column. The sample cells are bores through the cylinder, parallel to its axis and spaced along a cylinder of revolution concentric to the axis. The cells are preloaded with samples to be analyzed. Stationary carrier fluid inlet and outlet conduits extend into the chamber above and below corresponding points on the cylinder defined by the sample cell placement. The inlet conduit is connected to a high pressure source of carrier fluid. As the sample holder is rotated, successive sample cells are aligned with the inlet and outlet conduits such that the sample is forced through the outlet conduit into the column. This struc- ture eliminates the need for movable high pressure seals between the outlet conduit and the sample cells, due to the maintenance of all the cells at an elevated pressure. -1-

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