2 • DP/SP Description
Doc. 065031-04 1/08 21
2.2.4 Vacuum Degassing Module
The DP/SP vacuum degassing module provides continuous, online eluent
degassing. Eluent quality significantly affects DP/SP performance, and
vacuum degassing eluents is one way to ensure high eluent quality.
Degassing helps prevent bubbles (caused by eluent outgassing) from
forming in the eluent proportioning valves (gradient pump only), pump
heads, and detector cell. Degassing eluents is especially important when
combining aqueous and nonaqueous components (for example, water and
acetonitrile).
The vacuum degassing module is either single-channel (in an isocratic
pump) or quad-channel (in a gradient pump). The module consists of:
• A degas chamber (with degassing membranes) with internal capacity
of 670
μL per channel
• A dual-stage diaphragm vacuum pump
• An on-board vacuum sensor
• The electronics required to operate the vacuum pump
• Tubing, fittings, and other accessories
The vacuum degassing module is automatically activated when the DP/SP
power is turned on. Allow about 10 minutes for the module to equilibrate.
NOTE Make sure the run time is long enough to ensure
that the vacuum degassing module delivers the
optimal degassing performance.
Manual Control of the Vacuum Degassing Module
The vacuum degassing module normally remains on continuously. To turn
it off (for example, to investigate a leak), follow these steps:
1. In Chromeleon or Chromeleon Xpress, select Command on the
Control menu or press the F8 key.
2. In the Commands dialog box, select the pump name.
3. Select the Degasser command.
4. Select Off and click the Execute button.
5. To turn on the degasser again, select On and click Execute.
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