Evoqua WALLACE & TIERNAN DEPOLOX 5 E, Instruction Manual

Page: 59 / 92

DEPOLOX
®
5 E flow cell
Maintenance
5.
59
5.4 Checking electrode cleaning sand
Every week, check if there is sufficient electrode cleaning sand in
the cell body. The cleaning sand must be swirled around in the
bottom part of the cell body. The electrode cleaning sand is
necessary for cleaning the electrode of the 3-electrode measuring
cell and wears with time. Replace if necessary. See chapter 5.7
“Replacing or cleaning electrode cleaning sand, electrolyte
solution, reference electrode and diaphragms”.
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.
Proceed as follows:
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
cannot be cleaned. The diaphragms should be white in color. Any
discoloration is an indication that they are clogging and should be
replaced.
If the sample water quality is poor (e.g. high iron content), the dia-
phragms 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 diaphragms can remain
installed for up to a year, after which they must be replaced. See
chapter 5.7 “Replacing or cleaning electrode cleaning sand, elec-
trolyte solution, reference electrode and diaphragms”.
Figure 1 Cross-section through electrolyte tank
A Diaphragms
A