Possible values
Factory set‐
ting
Increment Lower value Upper value Remarks
Control
parameter
Tv
off 1 s 1 s 2500 s Function off
= 0 s
Additive
basic load
0 % 1 % -100 % +100 %
Manual
dosing
0 % 1 % - 100 % +100 %
↑ checkout
time
off 1 min 1 min 999 min
↑ checkout
time
off 1 min 1 min 999 min
Threshold 90 % 1 % 0 % 100 %
Declaration: What effect do checkout time
and threshold have?
↑ Checkout time
off
↓ Checkout time
off
A0745
Fig. 68: checkout time
The
[checkout time]
of the control should
prevent over dosing with chemicals in the
event of a fault.
Example: Sample water flows past the
sensor in such a way that in spite of
dosing, no chemicals reach the sensor.
The sensor cannot detect any change in
the measured value. There are now
enough chemicals in the sample water but
the controller continues dosing because it
does not detect any change in the meas‐
ured value. Here the
[checkout time]
pro‐
tects the control process. The controller
stops the control and thus also the dosing
of chemicals.
Control is stopped if during a settable time
(=
[checkout time]
) the control value lies
above a control value threshold
(=
[threshold]
). The
[checkout time]
can be
set differently for the control directions
[raise↑]
and
[lower↓]
. This makes sensor
for a two-sided pH control, if the concen‐
tration of the acids and alkalis are dif‐
ferent.
Operating Menus Independent of Measured Variables
127
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