Dosing device for gas chromatography
AssigneeSiemens Aktiengesellschaft
InventorMax Braunweiler
Life of this patent
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Abstract
In a dosing device for gas chromatography which includes a portion coupled to the sampling stream, a sample evaporation chamber, and a dosing plunger, the portion of the dosing plunger which carries the dosing volume is made of a highly heat conducting material and a high capacity current source is provided for heating the dosing plunger rapidly in the area of the dosing volume in order to quickly bring the dosing plunger to a high temperature such that heat will be transferred from the dosing plunger to the sample in the sample chamber and heat the sample.
Claims14
In a dosing device for gas chromatography which includes a portion coupled to the sampling stream, a sample evaporation chamber for coupling to the separation column of the gas chromatography device and a dosing plunger having a dosing volume, in the form of a recess formed therein, slidable between a sample-receiving position where it is in communication with the sample stream and a sample evaporating position where it is in communication with the sample evaporation chamber, the improvement comprising:
- (a) the portion of the dosing plunger carrying said dosing volume being made of a highly heat conducting material;
- and
- (b) means for heating said dosing plunger in the area of said dosing volume rapidly, said means including a high capacity current source, whereby, utilizing said high capacity current source, said dosing plunger can be quickly brought to a high temperature and heat transferred from said dosing plunger to the sample in the sample chamber for heating said sample.
Dependencies are inferred from the claim text.