Agilent Technologies Agilent 7890 Series Maintenance Manual page 281

Maintaining Your GC
Remove the large metal C- ring and the upper ceramic
9
insulator if they were not attached to the lid.
10 Remove the collector. If the detector is operated at high
temperatures, the collector parts may stick inside the
detector. Gently push and wiggle them to break the seal.
Figure 7 NPD collector, upper insulator, and metal C-ring
Use tweezers to remove the lower ceramic insulator and
11
the two small metal C- rings located above and below the
collector. If these parts are stuck together, do not
separate them. If they are not stuck, remember which
metal ring was on top of the insulator and which was
below it. The pieces must be reassembled in the same
orientation.
Figure 8 NPD lower ceramic insulator and metal C-rings
If not replacing the jet, skip to
12
Remove the column from the detector.
13
Maintaining the NPD
Metal C-ring, top
Ceramic insulator, upper
Collector
Metal C-ring, bottom
Ceramic insulator, lower
Metal C-ring, bottom
step 19.
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