YOKOGAWA RC400G, Руководство пользователя

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<8. Maintenance>
8-2
IM 12F4A1-01E
8.4 Glass Beads and Measuring Tank Cleaning
If the glass beads are contaminated, polishing effect is reduced and the indicator electrode is
likely to be contaminated.
Periodically clean the glass beads. At the same time, clean the measuring tank.
Conduct cleaning in the following procedure:
(1) Press [CELL] key in <MAINT.> mode to stop indicator electrode revolution.
When electrode rotation stops, <CELL> lamp extinguishes.
(2) Remove the electrode mechanism block.
Loosen two screws fixing the electrode mechanism block to the measuring tank bracket and
raise the electrode mechanism block.
(3) Remove the bead case, with glass beads contained, together with the beads case cover
from the measuring tank. Since the beads case cover is fit rather tight, take care not to
break it.
(4) Clean the measuring tank.
Remove contamination adhering to the measuring tank using a brush dipped in neutral
detergent. If manganese or iron adheres, clean the cell using diluted hydrochloric acid.
Finally, clean out the detergent using water.
CAUTION
Do not use organic solvents for cleaning the measuring tank. Otherwise, the transparency may
be damaged or cracks may occur.
(5) Transfer the glass beads to another container and wash the dirt off with dilute hydrochloric
acid. Then, rinse well with water.
(6) Clean the bead case and beads case cover.
Clean them according to the procedure described in step (4), cleaning the measuring tank.
NOTE
The beads case cover may become clouded in long-term use, which provides no harm in use.
(7) Install the bead case in the beads case cover and put the cleaned glass beads into the bead
case.
If the beads have obviously become smaller in size (much smaller than a diameter of 1.7 to
2.3 mm), replace them with new ones.
NOTE
Glass beads are worn in long-term use, thereby reducing the ability of polishing indicator
electrode.
The glass beads should be entirely replaced once every year.
For optimum polishing, the glass beads should be placed in the bead case so that the height of
bead bed reaches the lowest slit position with the indicator electrode inserted. (The polishing
ability cannot be recovered by replenishing the beads only by volume reduced by wear.)
(8) Reinstall the electrode mechanism block and fix it to the bracket using two screws.
(9) Turn on the power switch to restart operation.
14th Edition : Jul. 15, 2020