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Agilent 6890 Gas Chromatograph 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.
Figure 260-1 Solvent vapor exit accessory flow diagram
Solvent Vent Valve
Solvent Waste Port
1
3
2
50 mm Bleed Restrictor
(SS) Transfer Line
(SS) Union
320 mm
Transfer line
Detector
Cool On-column Inlet
Column
Splitter
Retention
Gap
(5M, 530 mm)
Retaining
Pre-Column
(2M, 250 mm)
HP-5MS
Analytical Column
(30M, 250 mm)
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