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< 10. Spare Parts and Consumables >
10-2
IM 12F5A1-01E
10.2.3 Indicator Electrode (K9332MB)
The indicator electrode is always polished with ceramic beads; it gradually wears and
ultimately becomes unusable. This is the primary factor determining the life of the electrode.
Recommended replacement interval of the indicator electrode is one year generally.
The abrasion-based life may be used as a guidance in providing for indicator electrode
replacement. However, recommended practice is to keep one spare always available since the
electrode could be inadvertently damaged or otherwise become defective.
The same applies to gold alloy indicator electrode (K9334JP) used in combined chlorine
insensitive version.
Note : Refer to the following : cool storage requirements for electrically-conductive silicon grease for indicator electrode.
[ Applying Electrically-conductive Silicon Grease to Indicator Electrode ]
The indicator electrode needs to be electrically connected to the driven shaft.
This is achieved by applying electrically-conductive silicon grease to the tapped part of the
indicator electrode.
Before use, check that this has been done. If not, apply silicon grease as follows. You can
purchase 3 ml tubes of conductive silicon grease from Yokogawa, the part no. is K9044FX.
Be careful not to get this grease on the outer surface, particularly the gold surface.
Apply a small quantity (half a drop) of grease to a small flat screwdriver (about 3 mm wide blade)
and apply to three equidistant places around the tapped hole, about 3 to 5 mm inside the tip.
Next screw the indicator electrode into this tapped (threaded) hole. Next unscrew the electrode
and check that no grease has been extruded to the outer surface. If it has, remove it with a cloth
that has been wetted with alkaline soap solution.
NOTE
If the conductive silicon grease gets on the electrode surface, measurement accuracy is likely to
be affected.
Conductive silicon grease needs to be applied only once.
10.2.4 Counter Electrode (K9332MK)
The counter electrode does not wear like the indicator electrode ; it can be continuously used
without replacement.
However, recommended practice is to keep one spare always available, in case of accidental
breakage.
10.2.5 Fuse (A1111EF)
Yearly fuse replacement in the converter is recommended to avoid unexpected operation
stoppage. Fuse (2A
(Note) Fuse may be used more than one year, we recommend periodical replace for planning maintenance.