12 Maintaining the NPD
To Maintain the NPD Collector, Ceramic Insulators, and Jet
Maintaining Your GC 197
Be careful! The oven or detector fittings may be hot enough to cause burns.
5 Remove the bead. See “To Replace the NPD Bead Assembly” on page 192.
This step exposes the interconnect spring. Be careful not to touch or disfigure the spring
while working on the FID. Any dirt or bending will reduce the sensitivity of your detector.
Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.
6 Remove the screws that secure the lid, then lift up the lid and set aside. The top metal
C-ring and upper ceramic insulator may be attached to the lid.
7 Remove the screws that secure the cover base, then lift up the cover base and set aside.
8 Remove the screws that secure the interconnect cover, then lift up the cover and set aside.
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