8 • Troubleshooting
Doc. 065031-04 1/08 185
ED Only
• Cell is off
Turn on the cell from the Control panel in Chromeleon or Chromeleon
Xpress.
8.7 Tailing Peaks
• Excess tubing void volumes
Check tubing connections for void volumes
• (CD) Long tubing lengths connecting
Minimize all tubing lengths between the injection valve and the detector.
• (DC Amperometry and Integrated Amperometry modes) Dirty or pitted
conventional (nondisposable) working electrode
Clean the working electrode with water and dry with pressurized air or
nitrogen.
Polish the working electrode (see Section 9.24.3
). If you are using a
disposable electrode, replace it.
8.8 Low System Backpressure
• Loose fitting
Make sure there are no liquid leaks in the flow system. Check tubing
connections throughout the system (including the check valves, injection
valves, and columns) and tighten or replace fittings as needed.
• RFIC Eluent Degasser tubing is ruptured
If flow from the EG waste line is normal but there is no flow through the
columns, the tubing assembly inside the RFIC Eluent Degasser has ruptured.
Replace the degasser (see Section 9.14
).
• Internal EluGen cartridge leak (from membrane barrier)
Leakage from the membrane barrier may trip the DP/SP low pressure limit
and shut down the pump. If all other causes of the low system pressure have
been eliminated, replace the EluGen cartridge (see Section 9.12
).
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