Agilent Technologies 7890A Instruction Guide

12 Instruction Guide
Replacing the NPD Bead
9 Reconnect the bead assembly cable to the NPD cable and
twist the ring to lock the connection.
10 Close the NPD cover and reinstall all GC covers. All covers
must be closed to get a stable NPD baseline.
11 For the 7890A GC, 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.
12 Restore normal NPD operating gas flows.
13 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.
14 Increase the temperature to operating value (310 to 320 °C
recommended). Allow 15 minutes for equilibration.
1
2
NPD Bead Replacement.book Page 12 Monday, October 13, 2008 2:32 PM

Agilent Technologies 7890A Specifications

General

Brand	Agilent Technologies
Model	7890A
Category	Laboratory Equipment
Language	English