Routine Maintenance: Inlets
Maintaining a cool on-column inlet
Released: March 2004 6850 Series II GC User Information page 174 of 256
6. Remove the existing insert from the inlet by gently pushing it out from
below with a wire or piece of column. Store the insert for possible later
use.
7. Drop the new insert straight into the inlet from the top.
8. Replace the spring on top of the insert.
9. Reinstall the septum nut or duckbill septum and cooling tower assembly
and tighten finger tight.
10. Reinstall the column, nut, and ferrule.
Replacing the fused silica syringe needle
1. Load the SERVICE method or reset the inlet and oven temperatures to
OFF or turn the main power switch off. Let the heated zones cool to room
temperature. Also, make sure that:
• If you have entered parameters that you do not want to lose, store
them as a method
• If the detector is on, turn it off.
2. Hold the syringe vertically and insert the fused silica needle so it is visible
inside the syringe barrel. If the fused silica needle cannot be inserted into
the syringe barrel, the Teflon ferrule (part no. 0100-1389) may be blocked.
You may need to replace the ferrule. Push the plunger down until it bot-
toms. The needle will now be flush with the end of the plunger.
3. When the needle is inserted, tighten the retaining nut to firm finger
tightness. Pull the needle gently to be sure the Teflon ferrule has formed a
tight seal with the needle. Tighten the retaining nut further, if necessary.
Fused silica needle
Ferrule sleeve
Teflon ferrule
To Next Page
Loading...
