sample injector

in chromatography
A device by which a liquid or gaseous sample is introduced into the apparatus. The sample can be introduced directly into the @C00859@-gas stream, or into a chamber temporarily isolated from the system by values which can be changed so as to make an instantaneous switch of the gas stream through the chamber. The latter is a @B00766@.
Orange Book, 2nd ed., p. 98 [Terms] [Book]