Agilent Technologies Agilent 7890 Series, Maintenance Manual

Page: 110 / 354

110 Maintaining Your GC
7
Maintaining the COC Inlet
To Check the Needle-to-Column Size on the COC Inlet
1 Gather the following:
• Insert (See “Consumables and Parts for the COC Inlet”
on page 102.)
• Syringe needle
2
Load the inlet maintenance method and wait for the GC
to become ready.
3
Check that the needle is the correct size for the desired
column id. If needed, replaced the needle with one of the
correct size. See
“Consumables and Parts for the COC
Inlet” on page 102, and “To Replace a Needle in a
Syringe” on page 122 or “To Replace the Fused Silica
Needle in a Syringe for the COC Inlet” on page 123.
4 Identify the correct insert for the column size. (See
“Consumables and Parts for the COC Inlet” on page 102.)
Use the insert that is the same size as the syringe needle
to verify that the column you plan to use is the correct
size.
5 Make a clean cut on the end of the column. (See “To
Install a Capillary Column with the COC Inlet” on
page 107.)
6 Insert the column into one end of the insert.
WA R N I N G
Be careful! The oven and/or inlet may be hot enough to cause
burns. If either is hot, wear heat-resistant gloves to protect your
hands
.
WA R N I N G
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.