Maintenance
50
4.
Remove the cathode electrode from the sensor holder.
Note
The surface of the gold cathode should be clean and smooth. Reading will be affected by the residual
contamination on the cathode surface.
5.
Clean up contamination on the cathode electrode surface.
Wipe off any remaining foreign matter on the cathode electrode with soft cloth or the
like.
If contamination still remains use detergent or nitric acid (0.1 mol/L).
If chemicals are not available or contamination still remains, polish the surface by a
abrasive paper attached.
After cleaning rinse chemicals by tap water throughly. If the pin jack is wet wipe and dry
it.
6.
Attach the cathode electrode to the sensor holder while taking care not to touch the
gold pole surface.
7.
Install the sensor holder on the measurement cell, and then close the sensor cap.
Before attaching the sensor holder, clean up residual beads on the thread and O-ring.
8.
Turn ON the converter.
9.
Wait until the reading becomes stable, it takes 3 hours minimum.
10.
Perform calibration.
Refer to “ Calibration ” (page 57).
Cleaning the other electrodes
It is not necessary to clean the anode, reference and electrochemical cleaning electrode.
The surface of the anode electrode will be oxidized and covered with silver chloride
according to the chemical reaction of measuring chloride. The surface of the reference
electrode is silver and silver chloride. The reference electrode is a probe to detect
potential of the sample water. The graphite electrochemical cleaning electrode is a
counter electrode of the cathode electrode for cleaning.
Cathode electrode
Pin jack
h19136 | UTC 2020/03/30 3:34:51
