Detectors 5
Advanced Operation Manual 193
column in the constant pressure mode, choose Column
+makeup=constant.
c If your column is not defined, enter a makeup gas
flow. Only constant flow is available.
13 Monitor the offset adjustment process.
a If Auto Adjust is On, the adjust offset process starts
automatically when the detector reaches setpoint. If
Auto Adjust is Off, the Bead Voltage will gradually go to
the last setpoint after the bead reaches setpoint
temperature and the Dry Bead time has elapsed.
b If you need to set a new target offset, enter an Adjust
offset value. Adjust offset starts when the detector
reaches setpoint.
c If Auto Adjust is Off, you can manually start the Adjust
offset process by scrolling to Adjust offset, then pressing
[On/Yes].
d If your standard operating procedures require that you
set the bead voltage directly, see “Setting NPD bead
voltage manually (optional)” on page 199.
Selecting an NPD bead type
Three beads are available:
Tabl e 50 NPD beads
Bead type Part number Advantages Disadvantages
White ceramic G1534-60570 Standard Phosphorus tails
Black ceramic 5183-2007 Durable, no
phosphorus
tailing
Lower nitrogen
sensitivity,
about 40%
Blos bead G3434-60806 Moisture
resistant, long life
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