6.6 Setting the limit values
Hysteresis
An hysteresis is installed here so that when in the
range of the limit value of the control module delta
®
,
switching is not constantly carried out between the
control and base load metering.
The hysteresis is approx. 2% of the measuring range:
–
(„Limit value up“ minus „Limit value down“) * 2 %
You have the possibility of setting the permissible value for the
controlling for each sensor type. When a measurement value lies
outside this limit value, the control will be discontinued. Basic load
control is only active in this case.
If the measurement value lies outside the limit value than a
warning is reported and the symbol
is displayed in the status
display of the delta
®
solenoid metering pump.
A0313
Clear
Main
proControl
Set
Controller
Set
Sensor calibr.
low: 0.0 ppm
Limit value
high: 10.0 ppm
Concentration
Chlorine sensor
Limit value
Controller
Basic load
Parameter
or
or
pH sensor
Redox sensor
low: 3.0 pH
Limit value
high: 12.0 pH
low: 200 mV
Limit value
high: 700 mV
Operation
Aux.
Setpoint
low: 0.0 ppm
Limit value
high: [10.0] ppm
Chlorine sensor
or
or
pH sensor
Redox sensor
low: 3.0 pH
Limit value
high: [12.0] pH
low: 200 mV
Limit value
high: [700] mV
Fig. 12: Setting the limit values
Sensor Factory setting Settings
top bottom
Chlorine 0 ppm 20 ppm 0 ppm up to the maximum value of the sensor. In incre‐
ments of 0.1 ppm
pH 0 pH 14 pH 0 pH to 14 pH. In increments of 0.1 pH
Redox 0 mV 1,000 mV 0 mV to 1,000 mV. In increments of 1 mV
Operating Schematics / Display Symbols
27
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