User guide

Inlets 8
Advanced User Guide 201
8
Press [Prep Run] (see “Pre Run and Prep Run” on page 171)
before manually injecting a sample. This is automatic if an
Agilent sampler is used.
MMI solvent vent mode
This mode is typically used for large volume injections. For
single injection use a 50 to 500 µL syringe and the ALS variable
plunger speed to slowly inject the sample.
The sample is injected into a cold inlet. If conditions are
properly chosen and the sample is suitable, analytes deposit in
the inlet liner while the solvent evaporates and is swept out.
Large or multiple injections can be used to concentrate sample
in the inlet before transferring to the column for analysis.
Stage 1. Sample and vent
During sampling and venting, the split valve is open. The inlet is
at Initial temperature, which is at or below the solvent boiling
point.
Solvent vapors are swept out the vent, while sample deposits on
the liner walls or packing.