13 Maintaining the NPD
To Replace the NPD Bead Assembly
216 Maintaining Your GC
To Replace the NPD Bead Assembly
1 Gather the following:
• Replacement NPD bead assembly, see “Consumables and Parts for the NPD” on
page 210.
• Lint-free gloves
• T-10 Torx screwdriver
2 Set GC options for a new bead.
a On the GC touchscreen, go to Settings > Configuration > Detectors to enable Dry Bead
and Auto Adjust.
b Then go to Methods > Detectors, scroll to Detectors Specifics, turn off the bead.
Agilent data system users: Make the same changes noted above, apply them to the GC,
and then save the data system method and shut down the instrument session.
3 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).
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.
4 Turn off the NPD bead, and enable the Dry Bead and Auto Adjust settings.
Agilent data system users: After turning off the bead, save the data system method and
shut down the instrument session. (Note that in some data system versions, you may
need to use the GC touchscreen for these settings. To do this, the keypad must be
unlocked and you must close the GC parameters screen of the data system. Upload the
revised setting, then save the method and shut down the instrument session.)
5 Remove the GC detector top cover. See “To Remove the Detector Top Cover” on page 18.
Hazardous voltages are present when the electronics top cover is open.
6 Remove the electronics cover. See “To Remove the Electronics Cover” on page 20.
7 Put on lint-free gloves before touching any of the detector parts.
Be careful! The oven or detector fittings may be hot enough to cause burns.
Wear clean, lint-free gloves to prevent contamination of parts with dirt and skin oils.
8 Remove the screw from the NPD cover then lift up and set aside. See Figure 44.
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