Pr
o
Minent
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Maintenance
7.1
Cleaning of the lamp protection tube
Deposits (e.g. iron, manganese or lime) may form on the lamp protection tube during operation.
These deposits absorb UV radiation and must thus be removed in regular intervals.
NOTE
A cleaning is to be performed at the latest if the UV C sensor signal undershoots the alarm
threshold and if this fact is not the result of other causes such as lamp ageing or
significant deterioration of the UV transmission.
For many UV disinfection systems, an annual cleaning of the lamp protection tube together with
the lamp replacement is sufficient. For UV disinfection systems which are used to disinfect
waster water, partially a cleaning every one to two months is required.
The lamp protection tube can be cleaned when removed or by filling the radiation chamber with
a cleaning solution. In particular acids such as diluted phosphoric acid, citric acid or diluted
nitric acid are suitable for cleaning.
CAUTION
•
Do not use any corrosion- or stress crack-promoting acids such as hydrochloric acid!
•
Observe the safety datasheet of the chosen cleaning agent!
•
Wear appropriate protective clothing during cleaning
(safety goggles, protective gloves …)!
•
Ensure that no cleaning solution gets into the lamp protection tube!
•
Ensure that no cleaning solution gets into the piping network during the cleaning of UV
disinfection systems!
This applies in particular to drinking water disinfection and similar applications.
NOTE
Dispose of the used cleaning solution according to the valid provisions and regulations!
Version 1: Removal of the
lamp protection tube
왘
Press START/STOP
for 2 seconds to switch off the system
왘
Disconnect the mains plug
왘
Close the shut-off valves upstream and downstream of the radiation chamber
왘
Open the water drain screw as well as the bleed screw or the drain and bleed valve
왘
Drain the radiation chamber
왘
Loosen the knurled nut at the bracket of the lamp protection tube by hand
왘
Pull out the lamp cover such that the connector of the connecting cable can be removed
from the lamp
왘
Remove lamp and place aside
왘
Loosen the bracket of the lamp protection tube using the enclosed hook spanner
왘
Remove the bracket of the lamp protection tube from the radiation chamber by screwing it
out
왘
Pull out the lamp protection tube
왘
Remove the O-ring from the lamp protection tube
왘
Clean the lamp protection tube with cleaning solution or immerse in cleaning solution until
the deposits are completely removed
왘
Rinse the lamp protection tube with clean water and dry with a soft cloth
IMPORTANT
Examine the lamp protection tube for damages before the installation!
A damaged lamp protection tube may not be reinstalled.
왘
Examine the O-ring for damages; replace damaged O-ring
왘
Push the O-ring approx. 40mm over the open end of the lamp protection tube
왘
Insert the lamp protection tube into the radiation chamber
BA_DS_011_02_07_GB.p65
12.02.2007, 12:03 Uhr
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