System response
The system response of the controller is
set under the menu item
[System response]
.
[Normal]
is the selec‐
tion for 1-way controlled processes.
[xp]
The
[xp]
value indicates the controller's
proportional range. The
[xp]
value relates
to the measuring range limit of a controller
and is given as an absolute value, for
example with pH
[xp]
=1.5. With measured
variables
[such as]
chlorine, the sensor's
measuring range, and thus the measuring
range limit, is selected. For pH, the meas‐
uring range end is 15.45. The default is
thus
[xp]
value 1.54 . The
[xp]
value states
that with a deviation of ± 1.54 pH from the
setpoint, the control variable is ± 100% .
The smaller the xp value, the more sensi‐
tively and faster the control reacts, how‐
ever the control also moves slightly into
the over-control range.
Temperature filtering
In the
[Temperature filtering]
setting, the
temperature measurement can be
calmed, if the measured temperature is
subject to rapid fluctuations. Only the
measured temperature value shown in the
display is affected by
[Temperature filtering]
. The measured
temperature value, with which tempera‐
ture compensation, is performed is funda‐
mentally filtered
[medium]
and is unaf‐
fected by the
[Temperature filtering]
setting.
The following filter stages are possible:
n
‘stable’
–
‘Stable’
temperature filtering
heavily calms the measured
value.
n
‘medium’
–
‘Medium’
temperature filtering
shows the real changes meas‐
ured.
n
‘fast’
–
‘Fast’
temperature filtering
quickly calms the measured
value.
Decimal places
The function shows the pH value in the
display with one or two decimal places. An
adaptation of the display to one decimal
place makes sense if a change in the
1/100 value is unimportant or if the value
is unsteady.
Factory setting: 2 decimal places
Fluoride Measured Variable
When measuring fluoride as the meas‐
ured variable, the sensor signal is con‐
verted into a 4 - 20 mA signal by a FPV1
or FP100V1 measuring transducer,
depending on the measuring range. The
measuring transducer is connected to the
controller's mA input. The REFP-SE refer‐
ence sensor is connected to the meas‐
uring transducer using a coaxial cable
with an SN 6 plug.
FPV1 measuring transducer: Measuring
range 0.05 ...10 mg/l.
FP100V1 measuring transducer: Meas‐
uring range 0.5 ... 100 mg/l.
Glossary
175
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