Evoqua WALLACE & TIERNAN MFC, Instruction Manual, Page: 204 / 268

204
WT.050.580.000.DE.IM.0714
Maintenance
MFC
7.
Checking for tightness (daily) Check the entire measuring device including all screw connections
for leakage. Repair any leakage points immediately!
Please note
Air bubbles in the sample water influence the measuring accuracy.
The cause must be determined and remedied.
Checking the cell sand (weekly) Check that there is sufficient sand in the cell body.
The cell sand must be swirled around in the bottom section of the
cell body.
The cell sand is necessary for cleaning the chlorine sensor
electrodes and must be replenished or replaced when required.
(Refer to 6.3.2 “Filling the cell sand (DEPOLOX® 5 only)" on
page 182 and “Replacing cell sand in DEPOLOX® 5 three-
electrode cell" on page 205).
Please note
When fresh sand is replenished, the electrode current may
increase slightly for approximately 3 hours. Do not calibrate during
this time.
You must calibrate each time the cell sand is replaced.
The calibration must be checked after one day.
mV measurement
Check Redox in buffer solution every 4 to 6 weeks Page 210
Conductivity
Check conductivity every 4 to 6 weeks Page 212
Task Period/ Interval page