8 • Troubleshooting
Doc. 065031-04 1/08 187
with pressurized air or nitrogen. If the electrode is pitted, polish the
electrode (see Section 9.24.3
).
3. Check the value of the reference potential shift. See “
Using a Digital
Voltmeter to Determine Reference Potential Shift” on page 226. If the
value fluctuates by more than 30 mV, electrode passivation may occur
because potentials that are too high are being applied. Recalibrate the
reference electrode (see Section 9.24.5
). If the problem persists, replace
the reference electrode (see Section 9.24.4
).
Analog Output Option
• Analog output range set too high
Select a more sensitive analog output range.
8.11 High Background
• CR-TC is contaminated
Clean the trap column as instructed in the CR-TC manual. The manual is
included on the Dionex Reference Library CD-ROM (P/N 053891).
• Wrong eluent
Check that you are using the correct eluent for your application. For ED
detectors, verify that the pH readout is correct for your eluent.
• Background signal not offset from detector signal
Before injecting sample, allow the background signal to equilibrate, and then
press Autozero on the Control panel in Chromeleon or Chromeleon Xpress.
CD Only
• Background not suppressed by suppressor
Verify that the suppressor is turned on and the current is set to the correct
value. Refer to the suppressor manual for additional troubleshooting
guidance. Suppressor manuals are included on the Dionex Reference Library
CD-ROM (P/N 053891).
• Regenerant fails to suppress background
Use a higher regenerant flow rate. Refer to the suppressor manual for the
suggested regenerant flow rate for your application.
To Next Page
Loading...
