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3 Use
3.1 Intended use
The Bewades N UV disinfection unit is used to disinfect drinking water.
In general, disinfection means a 99.99% reduction in the pathogenic
germs found in drinking water (4 log levels).
The standard unit is always used when highly controlled micro-
biological requirements are applied to the water and a certified unit
(e.g. ÖNORM M 5873-1, DVGW Worksheet W294) is required
For all series N BWT Bewades UV disinfection units, a UV fluence (do
-
sage) of 400 J/m
2
has been biodosimetrically verified. This leads to a loss
of the ability of the micro-organisms in the water to multiply (reproductive
cell death), so they no longer pose a danger to human health.
The UV disinfection process does not change the chemistry,
pH value, colour or taste of the water.
3.2 Foreseeable misuse
Operating the system with parameters other than those specified in this
documentation and in section 3.1.
Not adhering to the prescribed maintenance and service intervals.
Using spare parts and consumables not approved by BWT.
3.3 Disclaimer
The manufacturer is released from any liability if the customer intentio-
nally or forcibly removes guards or safety devices, if the customer wilfully
modifies or circumvents the same, or if the customer does not follow the
instructions in this operating manual or on the system.
3.4 Other applicable documentation
Observe all documents from suppliers that were included with delivery.
These are considered part of this documentation and must not be
changed or removed.
1. Electric circuit diagram / Electric cabinet with cabinet overview.
4 Function
The water to be treated flows upwards through the stainless steel
radiation chamber.
Special elements (para-flow concept) are installed in the radiation cham
-
ber to ensure that the radiation spreads equally to all parts of the water.
The UV emitters generate UVC rays at a wavelength of 254 nm, which
are particularly effective for disinfection. This UVC radiation deactivates
the germs in the water safely.
The UVC sensor that is integrated in a sensor window permanently
measures the current emission power in W/m².
The unit is controlled/monitored by a processor-controlled electronic
system.
4.1 Design of UV units
UV unit design is primarily based on the following parameters:
● Maximum flow (m3/h)
●
UV absorption of the water to be treated at 254 nm: Listed as SSK-
254 nm (1/m) or UV transmission based on a defined layer thickness
(e.g. % /cm).
●
Minimum reference emission power: This is the emission power
(wavelength 254 nm) that is measured with a standard UV sensor
in a standard sensor window in W/m². During operation, the power
must not fall below this value. If the value falls below this switching
point, the unit switches off and the water flow is interrupted.
●
Legal provisions and regulations, e.g. German Drinking Water
Ordinance [‘Trinkwasserverordnung’] and DVGW Worksheets.
Summary of Contents for Bewades 200W200/11N
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