BS EN 54-25:2008 pdf free download – Fire detection and fire alarm systems Part 25: Components using radio links.
The verification of this calculation shall be made as defined in 8.3.3. Annex C gives an example for the calculation of the service life of the autonomous power source.
5.3.3 All components powered by an autonomous power source shall be able to transmit a fault signal (low power) before the power source fails. The following conditions shall be taken into account:
a) the component shall be capable of generating and transmitting a fault signal within 60 mm after replacing a good or new autonomous power source by a preconditioned power source representing a discharged power source at the end of its service life;
b) the component shall be capable of operating as intended when it is activated using the preconditioned power source representing a discharged power source at the end of its service life;
c) the components shall keep the alarm condition and/or another activated condition for at least 30 mm (where alarm condition is not applicable).
The procedure to verify this requirement is specified in 8.3.4.
5.3.4 The loss of the power source shall be indicated as a fault signal from point in accordance with EN 54-2. Where several power sources are used for different functions in one component, the fault signal shall be given for each power source, see 5.3.3.
5.3.5 The component shall either be designed to make polarity reversal impossible or, if not, the polarity of the connections of the power source shall be identifiable and the polarity reversal shall not damage the component.
The procedure to verify the reversal of polarity is specified in 8.3.5.
5.4 Environmental related requirements
5.4.1 General
Components shall be subjected to the environmental tests defined in the relevant part of EN 54. The functional tests of the radio part of the component before and after the environmental treatment shall be carried out in accordance with 8.3.
NOTE The type and seventy of the environmental tests are separately specified for the following main categories of equipment containing a transmitter/receiver:
— control and indicating equipment (CIE);
— other components (e.g. detectors, manual call points, input/output devices).
5.4.2 General test procedure
Unless otherwise stated, the components of the FDAS containing the transmitter and the receiver respectively shall be mounted in the radio frequency shielded test equipment as described in Annex A.
When testing the component transmitting the alarm signal, it shall be tested together with a typical component receiving the alarm signal and vice versa.
The measurements of the attenuation values A shall be always carried out with the component mounted in the test equipment, and with the fixtures closed correctly. However, during some of the environmental exposures the fixtures shall be opened or the equipment under test shall be taken out of the fixture.
The specimens submitted shall be deemed representative of the manufacturer’s normal production with regard to their construction and calibration. Where specimens comprise at least two parts: a base (socket) and a head (body) and the radio part and the power supply are located only in one of these parts, only this part shall be tested in accordance with this European Standard. The other part is used to trigger the radio part.
6 Documentation
The manufacturer shall prepare the documentation to evaluate the compatibility in the configuration(s) specified by the manufacturer. This documentation shall include at least the following.