Agilent Technologies 6890 Series Service Manual page 8

Contents
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
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
Jun 2001
Splitless mode..................................................................................... 2
Contents
Agilent 6890 Gas Chromatograph Service Manual
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