Sample injector for a high-pressure liquid chromatograph

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 that
• by 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.