Chapter: Injectors
Topic:
On-column InjectorOperation
The
oe-eeemn injector consists of:
1) The septum, ( partll'8671)..1353 )
wI1id1
IS
~
pjug
oIs.ilicor>e
rubber
wI1d!
allows
ee syringe
to
penetrate bul
whd!
pre–
v&nlS
thecarrier gas
from
escapOOQ. The
septum used
on
SRI
GCs
is
sometimes
called
a
' shimac1zu plug' type 1Ieplum
and
is widely
aval~b'"
from
GC supply
cata–
..
'
2)
The
Sj)eQal
seplum nul ( partll867G–
9090 )
10<
26-27
gauge syringe
needles
The
extended snoot on the septum nul
helps guode the syringe
needle
straight
onto
the column.
3)
The
wide-bol"e
capillaIYcolumn
adapter ( part#8690-9093 )
which
aligns
ee synnge needleand
the
column Ins.ode
the on-<:oll.rnnin,ector body
4) The injector
body
fitting
( partll8671)..
9094 ). ThIS
is
a stainless steel
swagelok
type IilIiogmodified
with
the
a<ldillon
of
~
carner gasmleltul>e
which
is
wekled mto
the side
5) A 118" to06mmgraphite r&dudng
femJle secures
the
wide-borfl ( .53mm )
capOUaIY column ir1to the injector
body
fiI·
ting. Eithef
soft
or hard graphrte
femJles
may be used
WIth
capillary columns
6) A 1/8'
swageIoI<
type
nut (slainless or
brass )
is used
to
COmpl'esslhe graphite
IemJlearourld
the
column. Stainless is
recommended
10<
OVen temperatures
_,OO'C
7) Awide-borecapdlary c:<:Mumn (
53mm
i d l 01 any length. The on.ooumn injec–
tor
is
normally
tIsed
w;th
wide"bore
capO~
lery or t/8" packedcolumns. not with
ce–
umnswhose Insidediameter ISless
than S3mms;nce
that
is
the
smallest dI–
ameter
intowI1ich
a standard 26 gauge
syrillQe ";1
fit.
Manl l2.nuh
As!lllown
above.
the
26 gaU9" needle on
the
stan–
dard
10 ul GC syrillQe
fits
perfectly into the bore 01
a .S3mmwK,le--bore capinaIYcolumn
