Contents
Jun 2001 3 of 24
Contents
Agilent 6890 Gas Chromatograph Service Manual
Leak testing—EPC and manual inlets ....................................................10
Preparation ........................................................................................10
Performing the leak test—EPC inlets.............................................12
Performing the leak test—manual inlets........................................14
Leak testing the EPC module only..................................................15
Forward pressure valve leaks..........................................................16
Locating leaks on the flow manifold...............................................16
Correcting leaks ................................................................................18
Potential leak points .........................................................................19
230 Cool On-Column Inlet
Theory of operation ....................................................................................1
EPC inlet...............................................................................................2
Manually controlled inlet ...................................................................3
Replacement procedures ...........................................................................4
Replacing the inlet ..............................................................................4
Replacing the heater/sensor assembly .............................................7
Replacing the inlet EPC flow manifold ............................................8
Replacing the supply fitting on a Type 1 EPC flow manifold........9
Leak testing EPC and manual inlets .......................................................10
Preparation ........................................................................................10
Performing the leak test—EPC inlets.............................................12
Performing the leak test—manual inlets........................................14
Leak testing the EPC module only..................................................15
Forward pressure valve leaks..........................................................15
Locating leaks....................................................................................16
Correcting leaks ................................................................................18
Potential leak points .........................................................................19
240 Programmed Temperature Vaporization Inlet (PTV)
Theory of operation ....................................................................................1
Operating modes .................................................................................1
Sampling heads....................................................................................2
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