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12 Injection Port
12.2 Glass Insert and Packing Requirements
NOTE
The position of silica wool for being displayed fig. 12.2.1 is for injecting by Auto Injector for AOC-20i.
During manual injections, the needle often goes further int the insert than for injection by an auto injector. However, ther is no need to change the silica wool position for manual injections. By plasing a septum on the needle, the length of the needle can be shortened to approximately 40 mm. (Alternatively,
change the position of the silica wool for manual injections.)
<Example> Needle length
Septum
Approx. 40mm
(a) Manual injection performed
with an AOC 17/20 needle
(43 mm length)
(b) Manual injection with a
syringe with a 50 mm
long needle
Fig. 12.2.2 Proper needle length for manual injections
Q Packing the silica wool
Pack silica wool evenly without making it too densely pacleed or too fluffy.
Q Applying and releasing pressure
If the column inlet pressure is released abruptly, the silica wool could change position, In
particular, do not remove the septum or loosen the column nut when the injection port is
under pressure.
GC-2010
115