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4.3.5 Setting UV Lamp Current
The lamp current can be freely selected within a defined range in connection with ballasts that
feature a bus interface. This adjustment makes it possible to adapt the UV lamps to specific
operating conditions.
The lamp current is also adjustable in operating and flushing modes.
The permissible limits for the lamp current are not monitored when the system is switched off.
If a lamp current is set outside the permissible limits, the error message “Lamp Current” will
appear after switching on the system and initialising the bus.
IMPORTANT!
The lamps are to be operated with standard current. Any deviation is appropriate and
permitted only in very few exceptional cases.
The range of the permissible lamp current as well as the standard current is defined under
“Technical Data” in Section 8.
ATTENTION!
Operation of the UV lamps with a current outside the permissible range can lead to
premature failure:
• The lamp current set too high causes overheating of the lamps and a reduction in the
UV-C output.
•A lamp current set too low can cause a marked reduction in the UV-C output.
Water temperatures < 8 °C If there is a slight reduction in the UV output from the UV lamps at water temperatures < 8 °C,
the UV output can be increased by slightly increasing the lamp current by 0.1 to 0.3 A above the
standard current.
End of effective life The UV-C output of lamps close to the end of their effective life can be slightly extended by
increasing the lamp current by 0.2 to 0.4 A above the standard current.
Presetting 3.5 A
4.3.6 Sensor Signal Display
The UV-C sensor monitors the UV-C output.
A drop in the sensor signal can be caused by:
• A coating forming on the lamp protective tubes
• Distinct deterioration in the UV transmission of the water
• Reduction in UV-C output of the lamps due to lamp ageing.
It is possible to choose between an absolute display in W/m
2
and a relative display of the sensor signal in %.
IMPORTANT!
The sensor signal is shown in W/m
2
as standard. Observe the supplementary instructions
for special applications, in which the sensor signal is displayed in %!
Presetting W/m
2
Sensor signal
display
in: W/m
2
Control
Lamp current
= 3.5 A
(min. 3.0 A)
(max. 3.5 A)
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