Selecting An Npd Bead Type - Agilent Technologies 7820A Advanced User's Manual

Selecting an NPD bead type

Advanced User Guide
flow mode, choose Constant makeup. For a column in the
constant pressure mode, choose Column +makeup=constant.
If your column is not defined, enter a makeup gas flow.
c
Only constant flow is available.
13 Monitor the offset adjustment process.
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 offset
b
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].
If your standard operating procedures require that you set
d
the bead voltage directly, see
manually (optional)"
Two beads are available:
Table 17 NPD beads
Bead type Part number
White ceramic G1534-60570
Black ceramic 5183-2007
Ceramic beads
"Setting NPD bead voltage
on page 94.
Advantages Disadvantages
Standard Phosphorus tails
Durable, no Lower nitrogen
phosphorus sensitivity,
tailing about 40%
5
Detectors
89