38
5. Maintenance
DEPOLOX® 5 E flow cell
EN
5.5
Checking electrolyte solution
level
Check whether the electrolyte solution is filled
approx. 3 cm above water level (narrowing of
the KCL container) and replenish if necessary.
1 Remove the plug in the upper part of the
electrolyte tank.
2 Inject the electrolyte. Use the syringe in
the accessory kit.
5.6
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 electrode case must
therefore be replaced regularly.
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
5.7).
Abb. 1 Cross-section through electrolyte tank
A Diaphragms
5.7
Replacing or cleaning electrode
cleaning sand, electrolyte solu-
tion, reference electrode and
diaphragms
1 Switch off the power supply.
2 Close the shut-off ball valve (D) 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 (C) 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 (A) is empty, close the
drain screw once more.
6 Remove the housing cover of the DEPO-
LOX
®
5 E flow cell.
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 DFMe elec-
tronics module. Hold the cable while
doing this as it must not be allowed to
twist.
9 Unscrew cap (B) to the 3-electrode mea-
suring cell counterclockwise up to the
mark and take it off (chapter 4.15).
10 Remove the signal cables (red, blue,
white).
A
NOTICE
•
When replacing the cleaning sand,
check also the electrolyte solution, the
reference electrode, the diaphragms,
the fine filter, the flow switch and the
check valve. Replace or clean if neces-
sary.
•
Steps 1 to 14, 22, and 25 to 34 apply
only to replacement and cleaning of the
electrode cleaning sand.
