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SRI GCs canbe factory equippedwith
several types of injectors. Themost
common is the “on-column” injector
which is suitable for .53mm capillary,
1/8” packedand ( in some cases ) nar-
row-bore capillary columns ( where the
sampledoes not require splitting ).
To install a1/8” packed column in the
on-column injector, slidea1/8” swagelok
nut andbrass ferrule set ( front andback
ferrule ) ononeendof the column. We
like tousea stainless steel nut becase
at temperatures over 200Cabrass nut
discolors and starts tobecome very soft.
We likebrass ferrules because they
seal better than stainless ferrulesespe-
cially the secondof third time they are
removedand re-tightened.
Slide the column into theon-column in-
jector from theoven sideuntil it bumps
upagainst the septum. Pull the column
back about 1 centimeter and tighten the
nuts and ferrules usinga7/32” wrench.
If you tighten the columnwith theendof
the column touching the septum, this
could stop the carrier gas flow since the
septumwould seal theendof the col-
umn.
Somepacked columnspurchased fromSRI
haveagashnear oneendof the column
specifically toprovidea
path for the carrier gas in
theevent it is installed
with theendof the col-
umn jammedupagainst
the septum
Column Installation
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On-column injector
1/8” brassswagelok ferruleset
1/8” stainlesssteel swageloknut
Gash incolumn
Septumnutwith
septum inside
Column Installation in theSRI Model 8610 and
Model 310GasChromatographs
equippedwith the on-column injector
