Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 48 / 268

48
WT.050.580.000.DE.IM.0714
Functions
MFC
4.
Adjusting the measurement
signal input
The µA signal input of the DEPOLOX
®
5 flow block assembly is
adjusted on the sensor module as follows:
The DEPOLOX
®
5 flow block assembly measuring cell current (µA
current signal) is directly proportional to the disinfectant
concentration in the sample water. Depending on how the
DEPOLOX
®
5 flow block assembly is used, the µA measuring
range on the sensor input must be adjusted according to the
operating conditions.
Please note
The µA measuring range setting depends on the cell, disinfectant
concentration and the type of disinfectant.
Setting guideline The difference between the µA cell current at 0 % disinfectant(or
sample water stop) and the maximum measured value must be
within the following µA measuring ranges:
• 0–70 µA
• 0–100 µA (factory setting)
• 0–200 µA
• 0–1000 µA
Please note
Select a higher µA- measuring range for a correspondingly high
concentration of disinfectant.
The "µA Meas. Range" parameter can be modified in the "Meas.
Range" menu of the respective module.
Setting the Upot
potential voltage
A variable potential voltage is output between the working
electrode and the reference electrode. If a disinfectant other than
Cl
2
is used, the potential voltage must be adjusted:
• Chlorine 250 mV (factory setting)
• Chlorine dioxide, ozone,
potassium permanganate
300 mV
The "Upot" parameter can be set in the "Meas. Range" menu of
the respective module.