Evoqua DEPOLOX, Инструкция по эксплуатации

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7. Maintenance DEPOLOX® 400 M
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7.5.3 Checking diaphragms
The two diaphragms (A) in the electrolyte tank
form the connection between the reference
electrolytes and the sample water. They can-
not be cleaned. The diaphragms should be
white in color. Any discoloration is an indica-
tion that they are clogging and should be
replaced. If the sample water quality is poor
(e.g. high iron content), the diaphragms
become soiled. This influences the measuring
accuracy. The two diaphragms in the elec-
trode case must therefore be replaced regu-
larly.
If sample water quality is very good, the dia-
phragms can remain installed for up to a year,
after which they must be replaced (chapter
7.5.4).
Fig. 1 Cross-section through electrolyte tank
A Diaphragms
7.5.4 Replacing or cleaning electrode
cleaning sand, electrolyte solution,
reference electrode and diaphragms
Replace or clean if necessary:
• electrode cleaning sand
• electrolyte solution
• reference electrode
• diaphragms
• fine filter
• flow switch
• check valve
1 Switch off the power supply.
2 Close the shut-off ball valve at the sample
water inlet.
3 On the pressurized version, close the
shut-off ball valve at the sample water
outlet.
4 Open the drain screw on the sample
taking unit and empty the cell body. To do
so, hold a collection vessel under it and
temporarily loosen a plug or sensor to
allow air to flow in.
5 When the cell body is empty, close the
drain screw once more.
6 Remove the housing cover.
7 Remove the sensors from the mounting
hole in cell body cover and keep them in a
safe place. See appropriate sensor opera-
ting instructions.
8 Separate the cable gland from electronics
module. Hold the cable while doing this as
it must not be allowed to twist.
9 Unscrew cap to the 3-electrode measu-
ring cell counterclockwise up to the mark
and take it offf (chapter 5.13.1).
10 Remove the signal cables (red, blue,
white).
Replacing electrolyte solution
11 Unscrew the upper knurled nut from the
electrolyte tank.
12 Take off or unscrew the cell body cover.
13 Remove the electrolyte tank complete
with electrode support from the cell body.
Rinsing out cleaning sand
14 Rinse the cleaning sand out of the elec-
trode mount with distilled water.
15 Unscrew the knurled nut from the elec-
trode mount and pull the electrolyte tank
out of the electrode mount.
16 Pull the electrolyte tank upwards out off
the electrode support.
17 Pull the plug out of the electrolyte tank.
Emptying electrolyte
18 Turn the electrolyte container upside
down and drain the KCI electrolytes by
lightly shaking it.
A
NOTICE
Steps 1 to 14, 22, and 25 to 34 apply only to
replacement and cleaning of the electrode
cleaning sand.