700 P electronics module
Description
3.
23
3.4.3
Controller modes for chlorine control
The 700 P electronics module offers two options for controlling the
concentration of disinfectants:
•
Cl
2
single feedback closed loop control
•
CEDOX control
Cl
2
single feedback closed loop
control
In this mode, the required Cl
2
value is held at the setpoint using the
PI single feedback closed loop control (standard chlorine regula-
tion).
CEDOX control
In this mode, the chlorine setpoint is continuously and automati-
cally optimized using a PI single feedback closed-loop control in
order to maintain a constant ORP value. For this procedure, the
setpoint entered is not Cl
2
as normal, but the required ORP voltage
is set as the setpoint. A specially developed CEDOX mode calcu-
lates the amount of free chlorine required in the water based on the
demand. This internal chlorine setpoint is used to measure the
required quantity of disinfectant using the PI single loop feedback
controller.
The variable or optimized Cl
2
setpoint must remain between the
“Min setpoint” and “Max setpoint” limit values.
Please note
DIN 19643 (DIN = German Industrial Norm) stipulates the follow-
ing Cl
2
limit values: Min = 0.30 mg/l and Max = 0.60 mg/l.
Requirement for CEDOX control:
•
Chlorine measuring and control
•
pH measuring and control
•
mV measurement
Please note
CEDOX control only works if the pH value deviates from the pH
setpoint by no more than 0.30 pH
Содержание WALLACE & TIERNAN 700 P
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