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Jun 2001 7 of 24

Contents

Agilent 6890 Gas Chromatograph Service Manual

Cleaning an FID jet and collector ...........................................................23

Cleaning the collector.......................................................................23

Cleaning the jet..................................................................................23

320 Nitrogen Phosphorus Detector (NPD)

Theory of operation ....................................................................................1

EPC detector........................................................................................1

Manually controlled detector ............................................................3

Recommended settings ..............................................................................4

Equilibration time ...............................................................................4

Turning hydrogen off during a solvent peak....................................4

Turning hydrogen off between runs .................................................4

Bead voltage.........................................................................................4

Extending the life of the bead ...........................................................4

Temperature programming................................................................5

Jets and collectors ..............................................................................5

Correcting NPD hardware problems........................................................7

Replacement procedures .........................................................................10

Software .............................................................................................10

Replacing the entire detector ..........................................................10

Replacing the active element (bead) ..............................................13

Removing the collector assembly ...................................................16

Replacing the jet................................................................................18

Removing the electrometer..............................................................19

Removing an EPC flow manifold ....................................................20

Installing a Type 2 manifold.............................................................22

Replacing the detector interface board..........................................28

Cleaning the NPD jet and collector ........................................................30

Cleaning the collector.......................................................................30

Cleaning the jet..................................................................................31

Agilent Technologies 6890 Series Service Manual

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