5.2 Normal mode
In normal mode, the UV sensor continues to monitor the UV
output:
If the UV output falls below the warning threshold: a warning is
emitted.
If the UV output falls below the safety threshold: The shut-off valve,
fitted on site, closes, a wiper cycle is triggered and the flushing
valve, fitted on site, opens.
The UV system switches off and enters fault mode
if the safety threshold is still not exceeded after
completion of one wiping cycle.
In this mode, the operator of the UV system has to
ensure, for the purpose of disinfecting the water,
that the flow of water is reliably interrupted and no
unradiated water can be conveyed.
5.3 Controlled operation
UV radiation is automatically adjusted in controlled operation. The
UV sensor measures the UV output and forwards the measured
UV current value to the control. The UV setpoint is either entered
directly in the control (operating mode: control, internal
[INT]) or
using a variable 4 ... 20 mA standard signal (operating mode: con‐
trol, external
[EXT]).
5.4 Automatic wiper
During the wiper process, the warning and safety
thresholds are not monitored, consequently the
shadowing caused by the wiper does not trigger a
false alarm.
If you press the
[F3] key [Wiper] in the standard display, then the
wiping process is triggered. This is independent of whether the
system is
‘ON’ or ‘OFF’ .
If you have activated regular wiping, then a wiping cycle occurs
automatically after the set interval has elapsed.
If the interval is set to
[0], then regular wiping is deactivated.
5.5 Temperature Monitoring
The water temperature in the radiation chamber is monitored
throughout the entire time the UV lamp is operating.
As soon as the water temperature exceeds the maximum tempera‐
ture, the UV system goes into fault mode.
Manually triggering a wiper cycle
Regular wiping
Function
17
