Maintaining the COC Inlet 7
Maintaining Your GC 141
To Replace the Fused Silica Needle in a Syringe for the COC Inlet
1 Gather the following:
• New fused silica syringe needle (See “Consumables and
Parts for the COC Inlet” on page 120.)
• Solvent
2 Loosen the retaining nut and remove the old needle.
3 Hold the syringe vertically and insert the new fused silica
needle so it is visible inside the syringe barrel. If the needle
cannot be inserted into the syringe barrel, the PTFE ferrule
may be blocked. You may need to replace the ferrule.
4 Push the plunger down until it bottoms. The needle will be
flush with the plunger end.
5 Finger-tighten the retaining nut. Pull the needle gently to be
sure the PTFE ferrule has formed a tight seal with the needle.
Tighten the retaining nut further, if necessary.
NOTE
The fused silica needle and syringe are only used with the cooling tower
and duckbill septum for manual, on-column injections onto 200-µm
columns.
WARNING
Wear safety glasses to protect your eyes from flying particles
while handling, cutting, or installing glass or fused silica capillary
columns. Use care in handling these columns to prevent puncture
wounds.
Fused silica needle
PTFE ferrule
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