To Replace The Fused Silica Needle In A Syringe For The Coc Inlet - Agilent Technologies Agilent 7890 Series Maintenance Manual

To Replace the Fused Silica Needle in a Syringe for the COC Inlet

N O T E
WA R N I N G
Maintaining Your GC
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.
Gather the following:
1
• New fused silica syringe needle (See
Parts for the COC Inlet"
• Solvent
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.
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.
Push the plunger down until it bottoms. The needle will
4
be flush with the plunger end.
Fused silica needle
PTFE ferrule
Finger- tighten the retaining nut. Pull the needle gently to
5
be sure the PTFE ferrule has formed a tight seal with the
needle. Tighten the retaining nut further, if necessary.
Maintaining the COC Inlet
"Consumables and
on page 102.)
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