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4 MAINTENANCE
4.1 General Cleaning
Warning. Before removing any electrode from a
flow line, ensure that any isolating valves have been
closed.
To ensure accurate monitoring, keep the electrodes free of
contaminants by periodic cleaning, the frequency of which
depends on the particular application.
4.2 Liquid Junction and Electrolyte Level
The procedures in this section are appropriate for both pH and
redox (ORP) electrode cartridges.
4.2.1 Replacing Liquid Junction – Fig. 4.1
Caution. Carry out the following procedure with
the cartridge inverted, as shown in Fig. 4.1, to prevent
spillage of the electrolyte.
Note.
A tool for removing and fitting liquid junctions is provided
in the electrolyte replenishing kit (part no. 7670 088).
Remove the liquid junction
using the key provided.
1
Electrolyte
level
(bottom of
junction
thread)
Fig. 4.1 Removing/Replacing the Liquid Junction
10
Note. After removing
the liquid junction ensure that
the O-ring is still in place in the
filling hole before fitting the
liquid junction. If the O-ring is
missing, leakage of electrolyte
will occur.
2
Screw in the old/new liquid
junction firmly.
O-Ring
4.2.2 Checking Electrolyte Level – Fig. 4.1
Periodically check the level of electrolyte (approximately every
three months) as follows:
a) Remove the electrode cartridge from the system.
b) Use the procedure in 4.2.1 to remove the liquid junction
observing necessary cautions and notes.
c) View the electrolyte level through the liquid junction hole
and top up to the bottom of the junction thread, if
necessary, using the pipette and electrolyte provided with
the replenishment kit.
d) Fit the liquid junction, or replace with a new one if
necessary, and install the electrode.
4.3 Storage of the Electrode
Caution. Failure to ensure the glass membrane
and reference element do not dry out may irreversibly
affect the response of the electrode.
If it is necessary to remove the electrode from the sample line,
fill the retained protective cap (see Fig. 2.6) with water and
cotton wool, or equivalent, and fit it to the cartridge.
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