Maintaining the NPD 14
Maintaining Your GC 277
16
Close the NPD cover, install the GC detector top cover,
and install the electronics top cover. All covers must be
closed to get a stable NPD baseline.
17 Configure the new bead.
• Set the bead type.
• Review the Maximum Bead Voltage setting and adjust,
if necessary.
• Review the Dry Bead and Auto Adjust Bead settings.
18 Restore normal NPD operating gas flows.
19 With all gases on, heat the detector to 150 °C and hold
for about 15 minutes, then increase the temperature to
250 °C and hold for 15 minutes.
20 Increase the temperature to operating value (310 to
320 °C recommended). Allow 15 minutes for equilibration.
21 Check the NPD leakage current. (See “To Check the NPD
Leakage Current” on page 285.) If > 2.0 pA, verify bead
installation or see the Troubleshooting manual.
22 If using an Agilent data system, connect to the
instrument.
23 Restore the analytical method. Confirm the detector
hydrogen, air, makeup gas flow rates.
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