226 Maintaining Your GC
11 Maintaining the NPD
8
Pull the electrometer away from the detector to free the
interconnect. Turn the electrometer to the right to obtain
working space. Be careful not to touch or bend the spring. Be
careful not to lose the EMI suppressor.
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.
Figure 6 NPD collector, upper insulator, and metal C-ring
Spring
EMI suppressor
Metal C-ring, top
Ceramic insulator, upper
Collector
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