4
Function
INFORMATION!: The shut-off valves and rinse valves do not form
part of the scope of delivery of the UV system and are provided by
the operator on site.
The water to be treated flows through the stainless steel reactor
past the UV lamp. UV radiation disinfects the water.
A0917
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Fig. 1: Typical installation layout for a UV system
1 Shut-off valve
2 Shut-off valve
3 Rinse valve
4 Sampling taps, fireproof
5 Reactor
6 UV sensor
7 Controller
The UV low-pressure lamp used generates a very high output of
UV radiation, which is effective for the treatment of water. The UV
lamp is located in a quartz lamp protection tube with good UV
transparency.
The compact design of the reactor and the flow result in evenly dis‐
tributed radiation of the entire stream of water.
A control monitors the UV system in conjunction with the UV
sensor.
4.1 Commissioning
Once the UV system has been switched on, the UV lamps are
ignited. Following ignition, the UV lamps need several minutes to
reach operating temperature.
The UV sensor monitors the UV lamps. As soon as the UV output
has exceeded the safety threshold and commissioning rinse time
t4 has elapsed, the UV system switches to normal mode.
If the safety threshold is not exceeded within the maximum permis‐
sible warm-up time (which equates to commissioning rinse time t4),
the control switches off the UV system and goes into fault mode.
The UV system switches to normal operation mode after the com‐
missioning rinse.
4.2 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
output.
Function
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