Chapter 15 Maintenance and troubleshooting
15.1 Maintenance
196 HORIBA
Filling internal solution (inner tube)
The inner tube of the electrode is of an air-tight construction that allows almost no outflow.
Replace the internal solution (inner tube), however, when the electrode has been used for a
long period of time and only half or less of the internal solution (inner tube) remains.
(The filling frequency for internal solution varies depending on the usage and storage condi-
tions, but under normal use it is approximately once a year.)
To fill an electrode with internal solution (inner tube), the electrode must be disassembled.
Use sufficient care during disassembly.
Items necessary when replacing internal solution (inner tube) are: a syringe, #330 (gel) stan-
dard solution, and the standard solution specified for the particular electrode.
Filling the electrode: disassembly procedure
1. Remove the protective tube and tip-type ion electrode from the combined elec-
trode and put the rubber cap on the tip-type ion electrode part.
2. Remove the rubber stopper from the standard solution (outer tube) filler port,
then take out the internal solution using a plunger.
3. Twist the electrode cap by hand and move it approximately 5 to 10 centimeters
toward the electrode connector side.
4. Remove the internal body 1 of the electrode by holding the electrode cap by
hand, then pushing the electrode while it is standing vertically on a desk or
other horizontal surface.
Rubber cap
Liquid
junction
part
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