Replacing O-Rings For Glass Electrode - YOKOGAWA PH8EHP User Manual

3.3.3

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. 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 3.3
O-ring (Ø6/Ø9)
Screw
Installing the O-ring
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IM 12B7J2-01E
3-3
11th Edition : Nov.20,2018-00