Replacing the NPD Bead
Instruction Guide 5
Preparing the GC
1 Gather the following:
• Lint- free gloves
• T- 10 Torx screwdriver
2 Set the NPD bead voltage to 0.0. (Do not set it to Off.)
Agilent data system users: After setting the bead voltage to
0.0, 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 keypad to set the voltage. To do
this, the GC 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.)
3 Set Adjust Offset to Off.
4 Cool the detector to 60 °C or lower. Leave all gas flows on. To
cool the detector faster, raise the GC detector cover and open
the hinged NPD cover.
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.
WARNING
Hazardous voltages are present when the electronics top cover is
open.
NPD Bead Replacement.book Page 5 Monday, October 13, 2008 2:32 PM
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