Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 51 / 288

SFC
Functions
4.
51
4.2.3 Redox Measurement
The Redox voltage is a measured variable in the field of water
treatment. The electrical potential present during the Redox
reaction is described as Redox voltage and represents the
oxidation strength of a system. The Redox electrode is a single-rod
electrode including silver/silver chloride reference system, which is
very robust and low-maintenance.
Picture 2 Sensor measuring module
The Redox measuring system consists of:
• mV module with a solidly soldered connecting cable
• Redox electrode
The mV-module must be installed in the module slot of the SFC.
Various controller functions are available depending on the
application selected.
The electrode can be installed in the flow block assemblies
DEPOLOX
®
5/DEPOLOX
®
Pool/VariaSens or in a separate Y-
style flow through assembly.
Installation notes
Ambient conditions
The following must be taken into account when installing the
Redox measurement:
• Select the sample water extraction point that guarantees a
proper mixture of disinfectant and a bubble-free sample water
flow.
• This does not require a certain flow rate.
• The electrode must be immersed at least 2 cm deep into the
sample water.
Please note
No water carrying lines made of copper piping may be installed.
These would distort the measurements.
• If the Redox electrode is not installed right next to the SFC,
extension cables with plug connectors are available (see 8.
“Complete Units, Retrofit Kits and Spare Parts”).
• If an extension cable is used (max. 50 m), an impedance
converter (see 8. “Complete Units, Retrofit Kits and Spare
Parts”) must be used on the electrode in order to guarantee a
stable measuring signal.