IM 01E20D01-01E
5-4
5. MAINTENANCE
5.2.3 Installing Replaceable Elec-
trodes
NOTE
It is recommended to replace the O-ring when
reinstalling the replaceable electrode. Use the O-
ring specified by Yokogawa (G9303SE: material
is fluororubber).
NOTE
Precautions for storage of O-rings:
• Keep them in a cool, dark place.
• Wrap them well.
• Do not use O-rings after one year since their
purchase.
(1) Push the electrode holder with end B of the tool
screwed into it, straight into the flowtube.
F0510.EPS
Electrode holder:
(Electrode A is engraved with "A"
and electrode B has no markings.)
Electrode lead wire:
Red: Electrode A
White: Electrode B
NOTE
• Check that the O-ring has not come off.
• Do not interchange electrodes A and B when
installing them. Install electrode A to the
electrode boss with the red lead wire and
electrode B to the one with the white lead wire.
(2) Using end A of the tool, tighten the electrode
holder.
F0511.EPS
Torque driver
Using the torque wrench or torque driver, tighten
the electrode holder to the following torque
values:
PFA lining:
8.0 N·m ±1 N·m (80 kgf·cm ±10 kgf·cm)
Polyurethane rubber lining:
3.0 N·m ±0.5 N·m (30 kgf·cm ±5 kgf·cm)
WARNING
If the electrode holder was not tightened to its
specified torque value, fluid leakage from the
electrode may result. Should fluid spill over the
electrode block, wipe it dry and check that the
O-ring has not come off.
(3) Fill the interior of the flowtube with the fluid and
check that there is no leakage from the electrode.
(4) Hold down the lead wire and terminal lug and
screw the mounting screw into the electrode using
the Phillips screwdriver.
F0512.EPS
Electrode mounting screw
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