Sample introduction and the injection chamber

The injector, which is the sample s entrance to the chromatograph, has different functions. Besides its role as an inlet for the sample, it must vaporize, mix with the carrier gas and bring about the sample at the head of the column. The characteristics of the injectors, as well as the modes of injection, differ according to column type. The use of an automatic injection system can significantly enhance measurement precision. 

For capillary columns able to handle only a small capacity of sample, even the smallest volume that it is possible to inject with a micro-syringe (0.1 p.L), can saturate the column. Special injectors are used which can operate in two modes, with or without flow splitting (also called split or splitless). 

O-Ring who seals the syringe needle during injection 

Duckbill-like aperture opens easily and seals reliably 

It becomes possible to inject greater volumes with standard syringies avoiding needle-induced discrimination. Furthermore, compounds having low boiling points (particularly solvents) can be eliminated. 

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