Cleaning The Npd Jet And Collector - Agilent Technologies 7820A Service Manual

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Agilent 7820 GC Service
Reassembly is the reverse of these steps.
Reconfigure the modified GC from the software keypad,
supplying requested information.

Cleaning the NPD jet and collector

The collector requires occasional cleaning to remove deposits
(usually white silica from column bleed, or black, carbonaceous
soot). Deposits reduce sensitivity and cause chromatographic
noise and spikes. The cleaning procedure presented here
suggests you use an ultrasonic bath to clean the collector and
other parts of the detector. However, if your collector is not too
dirty, it may be sufficient to scrub it with a nylon brush and then
use a burst of compressed air or nitrogen to blow stray particles
away.