13 Maintaining the NPD
To Maintain the NPD Collector, Ceramic Insulators, and Jet
220 Maintaining Your GC
To Maintain the NPD Collector, Ceramic Insulators,
and Jet
When replacing the jet, always install a new collector, ceramic insulators, and metal C-rings.
When replacing the collector, Agilent recommends replacing the ceramic insulators and metal
C-rings.
The insulation around the inlets, detectors, valve box, and the insulation cups is made of
refractory ceramic fibers. To avoid inhaling fiber particles, we recommend the following
safety procedures: ventilate your work area; wear long sleeves, gloves, safety glasses, and a
disposable dust/mist respirator; dispose of insulation in a sealed plastic bag; wash your
hands with mild soap and cold water after handling the insulation.
1 Gather the following:
• NPD ceramic insulator kit, see “Consumables and Parts for the NPD” on page 210.
• Collector
• Cap for the bead
• T-10 and T-20 Torx screwdrivers
• Tweezers
• Cotton swab
• Solvent
• Methanol
• Jet
• Lint-free gloves
• Compressed, filtered dry air or nitrogen
The bead is delicate. Be careful not to break or crack the bead. When performing
maintenance on the NPD, avoid touching the bead with your fingers, and prevent it from
coming in contact with other surfaces.
2 Turn off the bead and disable Adjust Offset.
3 Check and note the NPD leakage current for reference. See “To Check the NPD Leakage
Current” on page 225.
4 Place GC in maintenance mode: Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Start Maintenance. Wait for the GC to become ready to continue (all
zones cooled to safe handling temperatures).
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 216.
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