BS EN 14897:2006 pdf download
BS EN 14897:2006 pdf download.Water conditioning equipment inside buildings – – Devices using mercury low-pressure ultravio let radiators一 Requirements for performance, safety and testing.
— general malfunction signal shall be provided;
— when shutting down the device or in case of a breakdown of the electric power supply, a signal shall be provided which allows the stop of waterflow.
The following functions shall be displayed:
— device in function;
– failure signal for each lamp;
— Irradiance, in Ws’m2
— service time of the UV lamps;
— flow-related aLarm point(s).
4.42.2 Sensor
For the measurement of the irradiation, a sensor shall be provided to ensure disinfection under consideration of possible changes in water UV transmittance and lamp performance. Requirements for the device sensor are given in Annex A. Where national regulations apply, a sensor and monitoring window may have to fulfil certain requirements.
NOTE An example hr a monitotlng window us shown In Annex C
4.4.3 UV bacterIcidal treatment devices
The IN bactericidal treatment devices shall be equipped with a controller, which provides the following functions:
— operation and failure of the electrical function of the lamp(s) shall be indicated;
— general malfunction signal shall be provided.
The following functions shall be displayed:
— device in function;
— service time of the UV lamps.
4.5 Performance
The UV device shall apply a reduction equivalent fluence of at least 400 ,J1m2 at the end of the lamp service life for the specified flow rates and UV transmittance values.
The performance is evaluated with a type test for which the manufacturer shall provxle information in accordance with Annex D.
4.6 LabellIng
The information to be given on a nameplate, which shall be permanently fixed to the IN device and be legible when installed, shall be in accordance with Annex E.
4.7 Manual
The manual shall describe operation, control, deaning and service rneasures
The manual shall also contain at least the following information:
— operating diagram: transmittance vs. maximum admissible flow.
— water resulting from sampling (rinsing) shall be adequately disposed of to the provisions of EN 1717;
— replacement intervals for UV lamp(s), sensor (only for LJV disinfection devices).
5 Testing
5.1 General
The manufacturer shall provide the details arid documentation described in Annex 0. The device to be tested is checked for conformity to the documentation
The purpose of the type test is to verify that the UV fluence delivered by the device under test meets a reduction equivalent fluence of 400 Jim2 at the end of the lamp life, at the specified flow rates and transmittance values
Parameters to be changed during the test are the flow rate of the water and the UV transmittance of the water for the test of UV bactericidal treatment devices and the flow rate, the transmittance and the lamp-output, for the test of UV disinfection devices.
For the type test of UV disinfection devices the UV device shall be equipped with a sensor or with a specified monitoring window and a specified sensor if national regulation for these apply. The testing in the test rig comprises of five steps:
checking the compliance of the device to be tested with the specifications;
— data collection during the test (flow rate, water temperature, electrical power consumption );
— radiation physics tests. i.e determination of the irradiance (only for UV disinfection devices)
— microbiological test with the biodoswneter;
evaluation of the UV device and specification of the operating range.
The manufacturer shall provide data (flow rate versus UV transmittance), that give the testing pornts at which the UV fluence (400 Jim2) is reached at the end of the lamp service time and the percentage of UV output at the end of lamp service life (e.g. 70 %). The permissible operational range is determined by measurements of at least three test points which should cover the whole operational range.
The UV device to be tested shall have new lamps that have been in service for 100 n. The manufacturer shall provide an appropriate method to vay the output of the IJV lamps.
