Troubleshooting 175
4. Push the DPP shield to the right and slowly lift the DPP shield until it reaches
approximately a 90° angle, then gently lift the tab of the DPP shield and remove.
5. Loosen the thumb screw and lift the ISE cover.
6. Disconnect the electrode connectors.
7. Remove the thumbscrew (
1) to release the plate that secures the electrodes and the
block containing the electrode. (See Figure 5-38.)
8. Remove the electrode to replace.
Installing electrodes
NOTES
• Make sure the K and Na electrodes are conditioned. When the Cl and Ref electrodes
are taken out of their packaging, they are wet. Wipe the Cl electrode thoroughly, and
wash the Ref electrode using water.
• To store the reference electrode, refer to Storing the Reference Electrode on page
176.
1. Assemble the new electrodes in the correct order:
2. Set the electrodes in place, paying careful attention not to leave a space between
them.
Make sure an o-ring is between each electrode and that the ridges on the side of each
electrode fits into the depressions on the side of the electrode next to it.
CAUTION
Do not force the electrode. If a space exists between the electrode
connections, the plate retaining the electrodes cannot close. If you cannot
close it, move each electrode left and right little-by-little. Fasten the
thumbscrew tightly. If the retaining plate loosens during measurement, liquid
could leak, causing a problem with the instrument.
3. Tighten the thumbscrew while holding down each electrode with the retaining plate.
4. Insert the electrode connectors.
Priming the ISEs
1. At the ISE Operation window, select Execute to the right of the word Initialize.
2. Select
Yes when prompted to execute.
3. In the Bufferprime area, enter
3 into the Times field.
4. Select
Execute, then select Yes when prompted to execute buffer prime.
5. Verify the liquid is discharged smoothly from the dilution bowl during priming.
6. If the liquid is increasing without being discharged, a leak exists, an electrode is
incorrectly positioned, or a clog is in the drain system. If the liquid increases,
immediately stop the instrument.
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