Agilent Technologies 6850 Series II User Information page 173

Changing the septum nut or cooling tower and septum
If you need to change the insert, refer also to the next section,
insert".
1.
Warning Be careful! The inlet fittings may be hot enough to cause burns.
2.
3.
4.
5.
Installing an insert
1.
2.
3.
4.
5.
Released: March 2004
Press [Oven] and set the oven to 35°C. When the temperature reaches
setpoint, turn the oven off. Press [Front Inlet] or [Back Inlet] and turn off
the inlet temperature and pressure.
Locate the septum nut or cooling tower assembly at the top of the inlet and
remove (see Figure
rings and unscrew. If you are using a septum nut, grasp the knurling and
unscrew.
There should be a small spring at the inlet base. If the spring is stuck to the
septum nut, place it back in the inlet base.
If you are using a septum nut, remove the old septum with tweezers,
hemostat, or septum remover. Use tweezers to install a new septum. Push
the septum into the septum nut until properly seated.
If you are using a cooling tower assembly, locate the duckbill septum and
install in the inlet base so that the duckbill is inserted inside the coil spring.
Install the septum nut or cooling tower assembly and tighten firmly.
Before making an injection, check the alignment of the entire assembly.
Choose an insert. See
insert.
Press [Oven] and set the oven to 35°C. When the temperature reaches
setpoint, turn the oven off. Press [Front Inlet] or [Back Inlet] and turn off
the inlet temperature and pressure.
Remove the column, column nut, and ferrule.
Locate the septum nut or cooling tower assembly at the top of the inlet and
remove it. If the septum remains in the septum nut, do not remove it unless
you want to change it. If necessary, replace the existing septum or duckbill
with a new one. See
instructions. Set the inlet septum nut or cooling tower assembly aside.
Remove the spring from the inlet with an extraction wire, and set it aside.
Be careful not to lose or damage it because you will use the spring to keep
the new insert in position.
6850 Series II GC User Information
30). If you are using a cooling tower, grasp the three
Table 33 or Table 34
"Changing septa" on page 175
Routine Maintenance: Inlets
Maintaining a cool on-column inlet
"Installing an
for instructions on choosing an
for detailed
page 173 of 256