224 Maintaining Your GC
11 Maintaining the NPD
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.
1 Gather the following:
• NPD ceramic insulator kit (see “Consumables and Parts
for the NPD” on page 208.)
• Collector
• Cap for the bead
• T-10 and T-20 Torx screwdrivers
• Tweezers
• Cotton swab
• Solvent
• Methanol
• Jet (see “Selecting an NPD Jet” on page 212)
• Lint-free gloves
• Compressed, filtered dry air or nitrogen
2 Set the bead voltage to 0.0 and Adjust Offset to Off.
3 Check and note the NPD leakage current for reference. (See
“To Check the NPD Leakage Current” on page 230.)
WARNING
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.
CAUTION
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.
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