Cleaning The Npd Jet And Collector; Cleaning The Collector - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

Hide thumbs Also See for 6890 Series:

Table of Contents

Nitrogen Phosphorus Detector (NPD)

Cleaning the NPD jet and collector

Both the jet and collector bore require occasional cleaning to remove deposits

(usually consisting of white silica from column bleed). Such deposits reduce

sensitivity and cause chromatographic noise and spikes.

Turn off the detector and its heated zone; also turn off gases to the detector

(particularly hydrogen). Allow time for the detector zone to cool.

Remove the collector as described in this chapter.

Use compressed air or nitrogen to blow out loose material from inside

the collector. Do this carefully so as not to disturb the active element.

Wash the collector in hexane or isooctane. Then carefully dry the

collector using compressed air or nitrogen.

Avoid polar solvents, especially water; polar solvents may dissolve the

rubidium salt coating on the active element.

Agilent 6890 Gas Chromatograph Service Manual

6890a 6890 plus