Patent ID: 6148680
Filing Date: 2000-11-21
Classification: G01N

Abstract:
A sample injector for a high-pressure liquid chromatograph, comprising:a sample needle through which a sample which is to be chromatographically analyzed can be drawn in by action of a metering device;a means for moving the needle into a sample intake position and into a sample injection position;a capillary system for transporting solvent delivered by a solvent delivery system at high pressure to a chromatographic column and for transferring samples to the chromatographic column;said metering device being adapted for drawing a metered amount of sample through the sample needle and for releasing this amount of sample when the metering means is connected to the solvent delivery system, characterized in thatby the means for moving the needle in X, Y, Z axes, the sample needle is movable to various sample intake positions on a sample tray and to the injection position in which position injection into the capillary system takes place, whereby the means comprises a mechanism for vertical movement and a robot arm comprising a jib for X-slide movement and a rotation arm which is freely hingeable at the free end of the jib and which is in a position to carry out movements .+-.180.degree. in order to position the sample needle attached to the free end of the rotation arm along the X and Y axes;and in that the sample needle for high-pressure injection is connected to a flexible connection capillary comprising a glass capillary and a plastic coating.