12 Injection Port
12.4
12.
120
GC-2010 Plus
12.4Removing and installing the septum
Q Type of septum
The type of septum to install depends on the temperature of the injection port.
(1) Silicon rubber septum … When the temperature of the injection port is below 350 °C.
(2) Low bleed septum … When the temperature of the injection port is above 350 °C.
Q Removing the septum
Remove the septum according to the following procedure.
(1) Check the following items before removing the septum.
・ The temperature of the column oven and injection port should be below 50 °C. (Check
this before setting the column inlet pressure to 0 kPa.)
・ The column inlet pressure should be 0 kPa.
NOTE Removing the septum when the injection port is under pressure causes an abrupt pressure shift which
can change the position of the glass wool in the insert.
(2) Remove the septum nut, and take out the needle guide and septum.
Fig. 12.4.1
WARNING
Danger of burns.
Do not perform injection port maintenance until the temperature has
dropped below 50 °C.
CAUTION
Wait until the injection port has cooled to loosen screws and nuts to
prevent them from binding.
Top of Injection port
Septum nut
Septum
Needle guide
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