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Agilent Technologies 7890 Series - About the Multimode Inlet; Septum tightening (MMI)

Agilent Technologies 7890 Series
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Chromatographic Symptoms 3
Agilent 7890 Series Troubleshooting 55
Sample Decomposition in Inlet/Missing Peaks
Lower the inlet temperature.
Check for air or water in the carrier gas; verify gas purity and
functionality of traps.
Verify that the liner is appropriate for the sample being run.
Perform complete inlet maintenance: Replace all consumable
parts and bake out the inlet.
Install a deactivated liner (if liner is used).
Check for leaks at the septum, liner, and column fittings. (See
“Checking for Leaks”.)
Install an Agilent Direct Connect liner.
Use a pulsed pressure method for quicker sample transfer to
column.
Bake out the inlet. See the following:
To Bakeout Contaminants from the Split/Splitless Inlet
To Bakeout Contaminants from the Multimode Inlet
To Bakeout Contaminants from the Purged Packed Inlet
To Bakeout Contaminants from the COC Inlet
To Bakeout Contaminants from the PTV Inlet
To Bakeout Contaminants from the VI Inlet
Clean the inlet. See the following:
To Clean the Split/Splitless Inlet
To Clean the Multimode Inlet
To Clean the Purged Packed Inlet
To Clean the COC Inlet
To Clean the Septumless Head on the PTV Inlet
To Clean the Septum Seat in the Septum Head Assembly
of the PTV Inlet
To Clean the VI

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