BS EN 14897:2006 pdf download

BS EN 14897:2006 pdf download.Water conditioning equipment inside buildings — Devicesusing mercury low-pressure ultraviolet radiators ——Requirements for performance, safetyand testing.

4.2 Radiation chamber
The radiation chamber is made of corrosion resistant and UV resistant materials. Materials and substances used shall be suitable for contact with dflnking water.
NOTE Product Intended br use In water supply systems should conwly, when existing. with national regulations and testing arrangements that ensure fitness for contact with dnrtlng water. The Member states, relevant regulators and the EC Cor,wnission agreed on the principles of a future unique European Acceptance Scheme (EAS). which would provide a common testing and approv arrangement at European level. If and when the EAS is adopted. European Product Standards wiN be amended by the addition of an Annex Z1EAS under Mandate M/136, which WI contain formal references to the testing, certification and product marking requirements of the EAS.
The mechanical design and the construction shall comply with the relevant requirements for the pressure present, Direct or indirect leaking of radiation from the radiation chamber to the environment with a wavelength below 400 nm shall be avoided.
Radiation chambers shall be constructed in a way that they are easily serviceable.
For UV disinfection devices, the radiation chamber shaM be provided with a sensor for a representative irradiation measurement. The location of the sensor shall be designed so that the irradiation measurement is not disturbed by gas bubbles or sediment deposits.
4.3 Low-pressure mercury UV lamps
In order not to produce ozone, only lamps with a radiation range above 240 nm shall be used, At the line of 254 nm shall be 85 % of the total radiation intensity in the UV C range at the mercury resonance.
Lamp(s) shall be marked with a designation of type. Only those lamps used for the type test shaM be used in the UV devk The UV lamp(s) shaM be approved for the device by the manufacturer or he equivalent to the approved type used at the type test.