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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.

Electrolyte

level

(bottom of

junction

thread)

Fig. 4.1 Removing/Replacing the Liquid Junction

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.

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.