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- Hewlett-Packard Reference Manual

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Preventive Maintenance
Nitrogen-phosphorus detector (NPD)
178
is best to have a new jet on hand to exchange if a damaged jet is
suspected.
Nitrogen-phosphorus detector (NPD)
In addition to the detector itself, other systems associated with the
detector may also require routine maintenance.
Nitrogen•phosphorusdetectors use H
2
gas as fuel. If H
2
flow is on, and
no column is connected to the detector inlet fitting, H
2
gas can flow into
the oven and create an explosion hazard. Inlet fittings must have either
a column or a cap connected at all times.
WARNING
Cleaning
Both the jet and the detector base require occasional cleaning to remove
deposits (usually consisting of white silica from column bleed). Such
deposits reduce sensitivity and cause chromatographic noise and spikes.
Flame Ionization and Nitrogen-Phosphorus Detectors
Figure 8-14