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3.2
Replacing Consumable Parts
3.2.1
Replacing Liquid Junction
Even after washing the liquid junction, if normal measurement cannot be made, replace the liquid
junction.
When replacing the liquid junction, fill the sensor with KCl solution to just before the solution
overflows through the liquid junction mounting hole. Use a 3.3 mol KCl solution (a higher
concentration of KCl or KCl powder) for this application.
1. When the liquid junction
is to be removed.
Figure 3.4
3.2.2
Replacing O-rings for Indicator Electrode
As the inside of the indicator electrode mounting hole must have high insulation resistance,
fluorocarbon rubber O-rings - with superior chemical and heat resistance - are used for sealing.
Except for special uses, this O-ring does not need individual replacement. If any damage - which
might cause problems - is detected in the O-ring, as a rule, replace it along with the indicator
electrode. Although the O-ring can be replaced individually if the O-ring deteriorates much
faster than the indicator electrode, it is recommended that the whole indicator electrode be
replaced to avoid possible deterioration of the O-ring inside the indicator electrode. For individual
replacement of the O-ring, use the one recommended by Yokogawa.
When installing the O-ring, wind a slip of paper or tape around the thread part on the indicator
electrode so as not to scratch the O-ring. Otherwise, such scratches may damage its sealing
properties.
For ordering, refer to the Customer Maintenance Parts List (CMPL) at the end of the book to
check the appropriate part number of the O-ring.
O-ring (Ø9/Ø12)
Before installing, wind a slip of paper or tape
around the thread part to prevent scratches.
Figure 3.5
2. When the liquid junction
is to be installed.
Replacing Liquid Junction
O-ring (Ø6/Ø9)
Screw
Installing the O-ring
< 3. Maintenance on operation >
F3.4.ai
IM 12C07J01-01E
8th Edition : Apr. 27, 2020-00
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