228 Maintaining Your GC
11 Maintaining the NPD
19
Use a cotton swab wetted with solvent to clean the residue
from the inside of the collector and around the jet. If the
collector appears very dirty, replace it with a new one.
20 Install the bottom metal C-ring, the lower ceramic insulator,
and the top metal C-ring. See Figure 6.
21 Install the collector.
22 Install the upper ceramic insulator and top metal C-ring
above the collector. See Figure 7.
23 Install the lid, making sure that the NPD lid standoffs are in
their slots. Hold the lid flat while each of the screws is
tightened until they touch the lid. Tighten each screw evenly,
1/2 turn at a time, until tight. Do not overtighten.
24 Slide the electrometer interconnect into the slot on the lid
and lower the electrometer into the mounting tray. Be careful
not to touch or bend the spring.
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