About The Cool On-Column Inlet - Agilent Technologies 7820A Advanced User's Manual

About the Cool On-Column Inlet

Advanced User Guide
This inlet introduces liquid sample directly onto a capillary
column. To do this, both the inlet and the oven must be cool at
injection, either at or below the boiling point of the solvent.
Because the sample does not vaporize immediately in the inlet,
problems with sample discrimination and sample alteration are
minimized. If done properly, cool-on column injection also
provides accurate and precise results.
You can operate the inlet in track oven mode, where the inlet
temperature follows the column oven, or you can program up to
three temperature ramps. A cryogenic cooling option that uses
liquid CO or N from the oven cryogenic system can reach
2 2
sub-ambient temperatures.
Carrier Supply
80 PSI
Frit
Valve
PS
Ferrule
PS = Pressure Sensor Column
EPC Module
Valve
Septum
Cool on Column
Inlet Weldment
Column Adapter
Column Nut
Column
3
Inlets
Septum Purge
Frit
PS
43