Sample injector and sampling method, in particular for liquid chromatography
AssigneeProlab Instruments GmbH
InventorWerner DÖBELIN
Life of this patent
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Abstract
A sample delivery system for liquid chromatography is provided. The sample delivery system includes: a sample receptacle; a sample aspiration cannula for aspirating a sample located in the sample receptacle, the sample aspiration cannula being directed using a drive in a direction towards the sample receptacle so that a tip at a distal end of the sample aspiration cannula is immersed in the sample; and a guide element for the sample aspiration cannula provided above the sample receptacle, the guide element being designed as a washing device. The sample aspiration cannula can be retracted using the drive at least so far from the sample receptacle such that the distal end of the sample aspiration cannula may be cleaned in the washing device.
Claims22
A sample delivery system for liquid chromatography, the sample delivery system comprising:
- a. a sample receptacle;
- b. a sample aspiration cannula for aspirating a sample located in the sample receptacle, the sample aspiration cannula being directed using a drive in a direction towards the sample receptacle so that a tip at a distal end of the sample aspiration cannula is immersed in the sample;
- and
- c. a guide element for the sample aspiration cannula provided above the sample receptacle, the guide element being designed as a washing device, wherein
- the sample aspiration cannula can be retracted using the drive at least so far from the sample receptacle such that the distal end of the sample aspiration cannula may be cleaned in the washing device.
A method of retrieving a liquid sample from a sample vessel using a sample delivery system, the method comprising the steps of:
- a. lowering a sample aspiration cannula into the liquid sample so that a distal end of the sample aspiration cannula is immersed in the liquid sample so that an aspiration opening is positioned below a liquid level of the liquid sample;
- b. aspirating at least part of the liquid sample into and/or through the sample aspiration cannula;
- c. lifting the sample aspiration cannula;
- d. cleaning an outside of the sample aspiration cannula using a washing solvent, wherein the cleaning is carried out during the lifting step,
- and wherein an entirety of the distal end is wetted, preferably flowed around, by the washing solvent.
Dependencies are inferred from the claim text.