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Jun 2001 5 of 24

Contents

Agilent 6890 Gas Chromatograph Service Manual

Leak testing the PTV module only ..........................................................42

Forward pressure valve leaks..........................................................43

Locating leaks on the flow manifold...............................................43

Correcting leaks ................................................................................45

Potential leak points .........................................................................45

250 Volatiles Interface

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

Split mode ............................................................................................1

Splitless mode.....................................................................................2

Direct mode .........................................................................................4

Gas saver ..............................................................................................7

Replacement procedures ...........................................................................8

Replacing or cleaning the interface ..................................................8

Replacing the heater/sensor assembly ...........................................11

Replacing the EPC manifold............................................................14

Calibrating your interface ................................................................18

Replacing the filter............................................................................19

Replacing or cleaning restrictors ....................................................20

Replacing the gang fitting.................................................................21

Leak testing the volatiles interface .........................................................22

Leak checking....................................................................................22

Preparing the interface for a leak test ............................................25

Leak testing the EPC module only..........................................................26

Forward pressure valve leaks..........................................................27

Locating leaks on the flow manifold...............................................27

Correcting leaks ................................................................................29

Potential leak areas...........................................................................30

260 Solvent Vapor Exit Accessory

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

Replacement procedures ...........................................................................2

Replacing the valve/fitting assembly ................................................2

Replacing the bleed restrictor column .............................................4

Replacing the tri-column assembly...................................................5

Replacing the pre-column assembly .................................................6

Agilent Technologies 6890 Series Service Manual

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