ProMinent DULCO turb C Series, Assembly And Operating Instructions Manual, Page: 39 / 76

You can either deactivate the alarm
(OFF) or program it so that it works in
accordance with one of the following
modes:
n
Alarm HI: The relay triggers the
alarm in the event that the tur‐
bidity value exceeds the pro‐
grammed alarm value for at least
the specified period of time
n
Alarm LO: The relay triggers the
alarm in the event that the tur‐
bidity value drops below the pro‐
grammed alarm value for at least
the specified period of time
n
Alarm ERROR: The relay triggers
the alarm when an internal system
error occurs
Limit value alarm
The turbidity threshold at which the
alarm is triggered is referred to as the
„Limit value alarm“ . You can con‐
figure the limit value across the entire
display range of the device in steps of
0.01 NTU.
Delay period alarm
The alarm delay times prevent the
alarm from being triggered in the
event that the turbidity briefly exceeds
or drops below the threshold value.
The delay function works as follows:
n
Delay time
„Alarm on“: The tur‐
bidity must exceed the
„Limit
value alarm“ for a period of at
least the time configured here,
before the alarm will be triggered.
If the time for
„Delay alarm on“ is
set to 5 seconds and the turbidity
only exceeds
„Limit value alarm“
for 4 seconds, then the alarm will
not be triggered. However, if the
turbidity exceeds the
„Limit value
alarm“ for 5 seconds or longer,
then the sensor triggers an alarm.
n
Delay time
„Alarm off“: The tur‐
bidity must drop below
„Limit
value alarm“ for a period of at
least the number of seconds con‐
figured here, before the alarm will
be triggered. If the time for
„Delay
alarm off“ is set to 5 seconds and
the turbidity only exceeds
„Limit
value alarm“ for 4 seconds, then
the alarm will not be deactivated.
As soon as the turbidity remains
below
„Limit value alarm“ for at
least 5 seconds, the sensor deac‐
tivates the alarm.
Commissioning
39