Routine Maintenance: Inlets
Maintaining a cool on-column inlet
Released: March 2004 6850 Series II GC User Information page 167 of 256
Hardware
Because you are injecting sample directly into the column, most of the
hardware required is determined by your column inside diameter. Injection
technique, manual or automatic, must also be considered. Table 32 is a
checklist for choosing hardware and shows where to find instructions for
installing the hardware and injecting the sample.
Note that if you are performing automatic injections on a 250 µm/320 µm
column using an autosampler, you must adapt it for on-column use. See
“Adapting for cool on-column injection” on page 228 for details.
Table 32. Hardware and Procedures Checklist
Automatic injection Manual injection with septum nut Manual injection with cooling tower
Hardware
See Table 33 for part numbers See Table 33 for part numbers See Table 34 for part numbers
❒ Septum nut
❒ Insert
❒ Stainless steel needle
❒ Septum nut
❒ Solid septum
❒ Insert
❒ Stainless steel needle
❒ Cooling tower
❒ Duckbill septum
❒ Insert
❒ Fused silica needle (columns ≥200 µm)
or
❒ Stainless steel needle (columns ≥250 µm)
Where to find instructions
❒ “Installing an insert” on
page 173
❒ “Changing the septum nut or
cooling tower and septum” on
page 173
❒ “Installing an insert” on page 173
❒ “Changing the septum nut or
cooling tower and septum” on
page 173
❒ “Installing an insert” on page 173
❒ “Changing the septum nut or cooling
tower and septum” on page 173
❒ “Check the needle-to-column
size” on page 170
❒ “Manual injection with septum
nut” on page 171
❒ “Manual injection with cooling tower” on
page 171 (bottom) and “Replacing the
fused silica syringe needle” on page 174
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