Solvent Vapor Exit Accessory; Theory Of Operation - Agilent Technologies 6890 Series Service Manual

260

Solvent Vapor Exit Accessory

Theory of operation

The Solvent Vapor Exit (SVE) is a GC accessory for performing large volume
injections with a Cool On-Column inlet (COC). At the start of the run, the SVE
solenoid valve is open as the large volume sample is injected into the cool on-
column inlet and moves into the retention gap. The precolumn separates most
of the solvent from the analytes and vents it through the open valve. At a time
specified by the user to optimize the analysis, the valve closes, the oven
temperature program begins, and the retained solvent and analytes move onto
the analytical column for separation.
Solvent Waste Port
Cool On-column Inlet
Figure 260-1
Jun 2001
Solvent Vent Valve
1
Column
Splitter
Retention Retaining
Gap Pre-Column
(5M, 530 mm) (2M, 250 mm)
Solvent vapor exit accessory flow diagram
Inlets
Agilent 6890 Gas Chromatograph Service Manual
3
50 mm Bleed Restrictor
2
(SS) Transfer Line
Detector
(SS) Union
320 mm
Transfer line
HP-5MS
Analytical Column
(30M, 250 mm)
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