| 摘要 |
A frame is described, that is part of an injector which is used to load a sample at high pressure into a chromatographic column, wherein a tube coupling hole in the frame can not only couple to a standard 1/16th inch tube, but can also couple to a much smaller diameter tube which is useful for minimizing dispersion when small samples or small chromatographic columns are used. The tube coupling hole has a cylindrical inner end portion of a diameter substantially equal to the smaller tube diameter to closely receive it, a tapered middle portion, and a threaded outer portion. Ferrules for sealing tubes to the tapered hole portion, include a first ferrule having a hole that closely surrounds the smaller diameter tube, with the end of the tube lying in the cylindrical inner end portion. A second ferrule has a hole that closely surrounds the standard size larger tube, the tip of the larger tube lying against the tapered hole portion.
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