Table of Contents
Advertisement
(1)
Face the sensor
tip up and
remove the
defective liquid
junction from the
sensor.
Figure 3.4
3.2.3
Replacing O-rings for Glass Electrode
As the inside of the glass 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 glass
electrode.
Although the O-ring can be replaced individually if the O-ring deteriorates much faster than the
glass electrode, it is recommended that the whole glass electrode be replaced to avoid possible
deterioration of the O-ring inside the glass 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 glass
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
Syringe
(2)
Add KCl solution
to just before it
overflow through
the liquid junction
mounting hole.
Replacing Liquid Junction
O-ring (Ø6/Ø9)
Screw
Installing the O-ring
< 3. Maintenance on operation >
(3)
Place a new
liquid junction in
position.
F3.4.ai
IM 12B7K1-02E
3-4
11th Edition : Dec.14,2018-00
Advertisement
Table of Contents
