YOKOGAWA FC400G User Manual

< 8. Maintenance >
8-2
IM 12F5A1-01E
showninFigure8.2.Theelectrodemechanismblockisxedtothemeasuringtankusing
two screws at the lower part of the mechanism block.
Fixing
screws (2 pcs)
Electrode
mechanism
block
Electrode
mechanism
block cover
 Figure8.1 ElectrodeMechanism  Figure8.2 UnderMaintenance
BlockFixingScrews
(2) Removing the Indicator Electrode
Removetheelectrodemechanismblockcoverfromthedetector.Holdthegearssothat
the drive shaft does not turn and remove the indicator electrode. The electrode is screwed
into the drive shaft; turn the electrode counterclockwise. This time, do not touch the rotating
contact.(Figure8.5)Thedeformedrotatingcontactdisableselectrodefunction.)
Electrode surface
 Figure8.3 AppearanceoftheIndicatorElectrode
(3) Polishing the Electrode Surface of the Indicator Electrode
Spread the provided abrasive (alumina) onto dampened gauze and thoroughly clean the
electrode surface using such gauze so that any contamination such as oil and grease
iscompletelyremoved.Thenwasho󰀨anyabrasivesadheringtotheelectrodeinclean
running water.
Afterpolishingandcleaning,conrmthatcontaminationhasbeencompletelyremoved.
The clean electrode surface must be uniformly wetted.
CAUTION
Polish the electrode surface (gold electrode) by following the instructions below when it has
become corrugated or deformed from the original shape (about 3 mm in diameter).
Polishtheelectrodesurfacewithsandpaper(about#600)untilthesurfacebecomesnally
rounded. Then, polish it with sandpaper (about #2000), and lastly with polishing powder
(alumina). Make sure the electrode surface is clean and then install the indicator electrode.
Reduce the amount of ceramic beads if the electrode has deformed greatly. The ceramic beads
shouldbelledupto5mmunderthebottommostnotchofthebeadscasewhentheindicator
electrode is inserted.
(4) Installing the Indicator Electrode
Holdthegearssothatthedriveshaftdoesnotturn,andsu󰀩cientlyscrewtheelectrodeinto
the shaft. During installation, be careful not to touch the electrode surface.
Note: Polish the electrode surface again if you have touched it.

YOKOGAWA FC400G Specifications

General

Brand	YOKOGAWA
Model	FC400G
Category	Measuring Instruments
Language	English