IM 50.560CA UA (B/4-03) 81
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
b. Drain the cell by unscrewing the drain plug.
c. When the cell block is empty, install the drain plug.
d. Unscrew the electrolyte reservoir clamping nut (2) and remove
the cell cover (3).
e. Withdraw the complete electrode/electrolyte reservoir assembly
(4 to 11) from its housing. This can be achieved by exerting a
gentle pressure at the top of the electrolyte reservoir. Rinse off
the reservoir to remove any remaining grit particles.
f. Being careful of the cable connector, replace the assembly en-
suring that the keying pin in the base of the cell block locates
into its corresponding hole in the electrode housing (8).
g. Empty a half capful of grit into the cell block and replace the
cover. The assembly should then be secured in its housing with
the clamping nut.
h. Open the sample water shut-off valve at the inlet to the measur-
ing cell assembly.
i. Leave the cell running for an hour, to allow the system to settle
down, and then carry out the zero calibration procedure. This
procedure may be repeated after 24 hours if required.
• Electrode and membrane replacement
The membranes, which form the contact point between reference
electrode and sample water, cannot be cleaned. With very good water
quality, membrane life may extend for up to three years continuous
use. After this period of time however, they should be replaced. Where
the quality of the sample water is particularly poor, fouling of the
membranes may occur with a corresponding loss in cell efficiency
(Refer to the note in “Bimonthly check,” above, for further details).
With the electrode/electrolyte reservoir assembly withdrawn from
the cell block as described above, the electrodes may be removed and
replaced as follows (see Dwg. 50.560.000.010):
a. Slacken the cable gland locking nut and unscrew the cable gland
(11) taking care to avoid rotating the cable.
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