8 • DC Troubleshooting
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3. If soaking does not fix the problem, replace the electrode (see
8.28.4 No ED Cell pH Readout or Intermittent Readout
The pH reading is displayed on the ED ePanel in Chromeleon 7 or the EC
Detector Control panel in Chromeleon 6.8.
•
PdH reference electrode selected
Select the AgCl reference electrode mode on the ED ePanel in
Chromeleon 7 or the EC Detector Control panel in Chromeleon 6.8, or in
the Chromeleon 7 instrument method or the Chromeleon 6.8 program.
•
Disconnected reference electrode
Verify that the reference electrode cable is securely connected (see
•
Uncalibrated pH-Ag/AgCl reference electrode
Calibrate the pH-Ag/AgCl reference electrode (see
•
Dry pH-Ag/AgCl reference electrode
1. Soak the pH-Ag/AgCl reference electrode in a solution containing
1 M KCl and 1 M 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
Voltmeter to Determine Reference Potential Shift” on page 274
.
2. If soaking the pH-Ag/AgCl reference electrode does not fix the
problem, replace the electrode (see
To prevent a pH-Ag/AgCl 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 all fitting plugs. For longer shutdowns,
remove the electrode from the cell and store it in its storage bottle filled
with saturated KCl solution. See
for detailed instructions.
•
Contaminated pH-Ag/AgCl reference electrode
Replace the pH-Ag/AgCl reference electrode (see
Содержание Dionex ICS-5000
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