Dionex ICS-3000 - No Amperometry Cell Ph Readout or Intermittent Readout; Leak in Ph Reference Electrode Compartment

8 • DC Troubleshooting
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3. If soaking does not fix the problem, replace the electrode (see
Section 9.24.4
).
8.28.4 No Amperometry Cell pH Readout or Intermittent
Readout
The pH reading is displayed on the Chromeleon or Chromeleon Xpress
EC Detector Control panel.
• Disconnected reference electrode
Verify that the reference electrode cable is securely connected (see
Figure 8-7
).
• Uncalibrated reference electrode
Calibrate the reference electrode (see Section 9.24.5
).
• Dry reference electrode
1. Soak the reference electrode in a solution containing 1 M KCl and
1M HCl
long enough to restore the electrode potential to
<30 mV when compared to an unexposed Ag/AgCl reference
electrode. To test the electrode potential, see “Using a Digital
Voltmeter to Determine Reference Potential Shift” on page 226.
2. If soaking the reference electrode does not fix the problem, replace
the electrode (see Section 9.24.4
).
To prevent a reference electrode from drying out, make sure that
eluent is being pumped continuously through the cell. If the cell will
not be used for a short time (less than 2 days), disconnect the tubing
from the inlet and outlet fittings and install fitting plugs. For longer
shutdowns, remove the electrode from the cell and store it in its
storage bottle filled with saturated KCl solution. See Section 4.1.2
for
detailed instructions.
• Contaminated pH reference electrode
Replace the reference electrode (see Section 9.24.4
).
8.28.5 Leak in pH Reference Electrode Compartment
• Defective pH reference electrode O-ring
Replace the pH reference electrode O-ring (see Section 9.24.6
).