140 Maintaining Your GC
7 Maintaining the COC Inlet
To Replace a Needle in a Syringe
1 Gather the following (see Table 15, “Recommended parts for
injections onto 0.25-mm fused silica columns,” on page 121):
• Syringe barrel
• Needle, 250-µm or 320-µm
2 Unscrew the syringe barrel cap and remove the spring.
3 Make sure that the needle has the PTFE disk as shown below.
If the syringe barrel does not have the PTFE disk, use the
instructions in the syringe box to wrap the needle.
4 Check the new needle for a small wire inserted for shipment.
Remove the wire if present.
5 Slide the spring and the cap over the needle.
6 Insert the needle into the syringe barrel.
7 Screw the cap back on the syringe barrel.
Plunger
Barrel
Needle
Spring
Cap
PTFE disk
Needle
Stop
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