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Jun 2001 9 of 24

Contents

Agilent 6890 Gas Chromatograph Service Manual

341 Micro-cell Electron Capture Detector (µ-ECD)

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

EPC detector........................................................................................2

Replacement procedures ...........................................................................3

Replacing the entire detector/detector cell .....................................3

Replacing the heater/sensor assembly .............................................6

Replacing the makeup gas adapter ...................................................9

Removing an EPC flow manifold ....................................................11

Installing a Type 2 manifold.............................................................13

Removing the signal board...............................................................18

Replacing the detector interface card ............................................20

Diagnostics.................................................................................................22

Frequency test ...................................................................................22

Leak test .............................................................................................23

Maintaining a µ-ECD detector .................................................................25

µ-ECD bakeout (thermal cleaning) .................................................25

Performing a radioactivity leak test (wipe test)............................26

350 Flame Photometric Detector (FPD)

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

Single wavelength FPD.......................................................................2

Dual wavelength FPD .........................................................................3

Operating conditions ..........................................................................3

Replacement procedures ...........................................................................4

Replacing the entire detector ............................................................4

Column installation.............................................................................6

Cleaning/replacing windows, filters, and seals ...............................8

Cleaning/replacing the jet ................................................................12

Replacing the transfer line fused silica liner .................................15

Replacing the photomultiplier tube ................................................18

Replacing the heater/sensor assemblies ........................................20

Replacing the ignitor glow plug.......................................................22

Removing an FPD flow manifold ....................................................24

Installing a Type 2 manifold.............................................................25

Agilent Technologies 6890 Series Service Manual

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