Sample injection needle assembly - for gas chromatograph

摘要

The pipette for the measuring out and introduction of the sample consists of a needle with a length axis extending capillary channel, the inlet opening of the needle lying on its peripheral surface, and in which the needle has a chamber for the evapn. of the sample, sepd. from the outside air by a seal, into which the needle can be inserted and withdrawn without breaking air tight seal of the chamber which is connected at one end of the carrier gas source and at the other to the column, which possesses an element directing the flow of the carrier gas into the inlet posn. of the pipette. towards the inlet opening of the capillary channel, the seal consists of rubber-elastic material and is situated at the end, of the evapg. chamber, while the needle is fabricated in a material which permits the penetration of the seal for the purpose of introducing the sample into the evapg. chamber, in such a way that the inlet opening of the capilary channel of the needle is covered over by the sleeve during its penetration of the seal.