DEPOLOX® 400 M
7. Maintenance
77
EN
Replacing reference electrode
19 Replace the reference electrode. To do
this, screw the reference electrode out of
the electrolyte tank. Lightly moisten the
O-ring and screw a new reference elec-
trode into the electrolyte tank.
Replacing diaphragms
20 Remove both diaphragms from the elec-
trolyte tank using a suitable tool (e.g.
tweezers).
21 Push new diaphragms into the electrolyte
tank. Lightly moisten the O-ring before fit-
ting.
22 Reinsert the electrolyte tank into the elec-
trode support.
Filling electrolyte
23 Fill the tank with fresh electrolyte solu-
tion (approx. 3 cm above the water level
or up to the narrow section of the KCI
tank). Observe the use-by date of the
electrolyte solution!
24 Insert the plug into the electrolyte tank.
25 Reinsert the electrode mount complete
with electrolyte tank into the cell body.
The cell body’s locating pin must engage
in the corresponding hole in the electrode
mount.
26 Screw the upper knurled nut back onto
the electrolyte tank.
27 Reconnect the signal cable, observing the
correct colors (chapter 5.13.1).
28 Fit the cap.
29 Fill in electrode cleaning sand (chapter
30 Insert or screw on the sensor and connect
with electronics module.
31 Refit and engage the housing cover.
32 Open the shut-off ball valve at the sample
water inlet.
33 On the pressurized version, open the
shut-off ball valve on the sample water
outlet.
34 The cell body refills with sample water.
35 Re-establish the power supply.
7.6 Cleaning or replacing the fine
filter of Varia Sens C
The fine filter must be cleaned or replaced to
protect the membrane sensor’s delicate mem-
brane against soiling or damage and to pre-
vent clogging.
1 Switch off the power supply.
2 Drain the sample water inlet and outlet
line.
3 Remove the housing cover.
4 Release both knurled nuts (A).
5 Remove the complete filter unit.
6 Remove the fine filter (C). To do this,
screw the M6 screw into the fine filter
and pull the fine filter out of the filter
unit.
7 Rinse the fine filter with water, replace if
necessary.
8 Push the fine filter into the filter unit.
Ensure that the O-ring (B) is fitted cor-
rectly.
9 Fit the complete filter unit. Ensure that it
is in the correct position (top/bottom).
10 Tighten the knurled nuts (A).
11 Refit and engage the housing cover.
12 Reconnect the sample water inlet and
outlet lines.
13 Re-establish the power supply.
NOTICE
After topping up or replacing cleaning sand,
the electrode current may increase slightly
for about three hours. Do not calibrate
during this time. Recalibrate after each cell
sand replacement. The calibration must be
checked after one day.
NOTICE
After 2 to 3 hours running-in time, perform
a chlorine calibration. If necessary, repeat
the chlorine calibration after 24 hours. See
chapter 6.6. An initially rotating air bubble
at the bottom of the cell body does not
affect the measurement.
