Maintaining the NPD 14
Maintaining Your GC 281
9
Remove the large metal C- ring and the upper ceramic
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.
11 Use tweezers to remove the lower ceramic insulator and
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.
12 If not replacing the jet, skip to step 19.
13 Remove the column from the detector.
Figure 7 NPD collector, upper insulator, and metal C-ring
Figure 8 NPD lower ceramic insulator and metal C-rings
Metal C-ring, top
Ceramic insulator, upper
Collector
Metal C-ring, bottom
Ceramic insulator, lower
Metal C-ring, bottom
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