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7 Maintenance
Maintenance of the UV system is restricted to cleaning the lamp protective tubes and the sensor
window replacing the wiper elements and O-ring of the clamping screw as well as to replacing
the UV lamps at the end of their maximum permissible useful life.
In the case of systems that have a fan installed in the control cabinet, the filter mats of the fan
and the air outlet filter in the control cabinet should be replaced at regular intervals (normally
once a year).
An operation log should be kept for documentation purposes; a corresponding form can be
found in the annex.
WARNING!
• Replace the UV-C lamps after the maximum permissible useful life at the latest!
Otherwise, operational reliability of the UV system can no longer be guaranteed.
• If not otherwise specified in the supplied datasheet, the maximum permissible useful life
is 14,000 hours.
• Disconnect the power plug or switch off the mains switch before performing any
maintenance/servicing work.
• Depressurise radiation chamber before performing maintenance work.
•UV-C radiation is harmful to the eyes and skin!
Place the UV lamps into operation only in their installed state!
Install the UV system in accordance with regulations and instructions before starting up
the UV lamps!
• Soiled filter mats of the fan and of the air outlet filter can cause overheating and
irreparable damage to the control cabinet.
7.1 Cleaning Lamp Protective Tubes
Iron, manganese or lime deposits can form on the lamp protective tubes during operation. Since
these deposits absorb UV radiation, they should be removed at regular intervals.
IMPORTANT!
The protective tubes should be cleaned at the latest when the sensor signal drops below
the warning threshold provided this is not due to other reasons such as lamp ageing or
substantial deterioration in UV transmission.
In many UV systems, it is sufficient to clean the lamp protective tubes once a year as part of the
lamp replacement procedure. More frequent cleaning – also daily – will be required if the system
is operated with dirty water.
All protective tubes in multi-lamp systems must be cleaned.
The lamp protective tubes can be cleaned in installed position with the manual wiper or by hand
when removed or by filling the radiation chamber with a cleaning solution. Acids are particularly
suitable for cleaning purposes such as diluted phosphoric acid, citric acid or diluted nitric acid.
CAUTION!
• Do not use acids that cause corrosion or stress corrosion cracking as hydrochloric acid!
• Observe the safety datasheet of the selected cleaning agent!
•Wear the necessary protective clothing when cleaning the system
(safety goggles, protective gloves ...)!
• Make sure that no cleaning solution enters the lamp protective tubes!
•Take particular care when cleaning UV systems to ensure that no cleaning solution
enters the piping system! This requirement applies particularly to drinking water
disinfection and similar applications.
NOTE!
Dispose of the used cleaning solution in accordance with valid guidelines and regulations!
Maintenance
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