Selecting An Npd Bead Type - Agilent Technologies 7890 Series Advanced Operation Manual

Selecting an NPD bead type

Advanced Operation Manual
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.
Monitor the offset adjustment process.
13
If Auto Adjust is On, the adjust offset process starts
a
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.
If you need to set a new target offset, enter an Adjust
b
offset value. Adjust offset starts when the detector
reaches setpoint.
If Auto Adjust is Off, you can manually start the Adjust
c
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
voltage manually (optional)"
Three beads are available:
Table 50 NPD beads
Bead type Part number
White ceramic G1534-60570
Black ceramic 5183-2007
Blos bead G3434-60806
Ceramic beads
Detectors
"Setting NPD bead
on page 199.
Advantages Disadvantages
Standard Phosphorus tails
Durable, no Lower nitrogen
phosphorus sensitivity,
tailing about 40%
Moisture
resistant, long life
Blos bead
5
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