Sample introduction system
AssigneeCiba-Geigy Corporation
InventorHansueli Buser
Life of this patent
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Abstract
A sample introduction system for a gas chromatograph having a chamber containing a needle for piercing a sample held in a holder and introduced into the chamber via a lock. The needle has a conical point into which a passageway opens perpendicular thereto, the passageway communicating directly with a separating column connected to the chamber. The needle is so shaped that as the sample is pushed onto the point over the entrance to the passageway the sample is sealed against the conical surface and on further penetration of the needle a gap is formed between the needle and the sample to allow ingress of a carrier gas supplied to the chamber.
Claims11
A sample introduction system for a gas chromatograph comprising:
- (a) a chamber;
- (b) a lock on said chamber;
- (c) an inlet for introducing carrier gas to said chamber;
- (d) a separating column;
- (e) a needle mounted in said chamber, said needle having a conical top part which converges upwards to a point, a bottom part having surfaces which converge upwards towards said top part and wherein the generatrices of the bottom part are at a smaller angle to the needle axis than the generatrix of the top part, and a passage extending from said bottom part up through said top part to emerge at an opening in the surface thereof, said bottom part having a bore to receive said separating column and communicating directly with said passageway;
- and
- (f) a sample holder mounted to introduce a sample via said lock into said chamber and onto said needle in sealing engagement with the surface of said top part, the bottom part of said needle having a configuration such that when said sample reaches said bottom part a gap is formed therebetween to allow carrier gas introduced via said inlet to enter said sample.
A sample introduction system for gas chromatograph comprising:
- (a) a chamber;
- (b) a lock on said chamber;
- (c) an inlet for introducing carrier gas to said chamber;
- (d) a separating column;
- (e) a needle mounted in said chamber, said needle having a conical top part, a bottom part, and a passage extending from said bottom part up through said top part to emerge perpendicular to the surface thereof in an opening therein, said bottom part having surfaces which converge upwards towards said top part and wherein the generatrices of the bottom part are at a smaller angle to the needle axis than the generatrix of the top part, and having a bore to receive said separating column and communicating directly with said passageway;
- and
- (f) a sample holder mounted to introduce a sample via said lock into said chamber and onto said needle in sealing engagement with the surface of said top part, the bottom part of said needle having a configuration such that when said sample reaches said bottom part a gap is formed therebetween to allow carrier gas introduced via said inlet to enter said sample.
Dependencies are inferred from the claim text.