BS EN 54-3:2014 pdf free.Fire detection and fire alarm systems Fire alarm devices一Sounders.
BS EN 54-3 The programme necessary to comply with this standard and any pre-set data, such as manufacturer’s settings, shall be held in non-volatile memory. Writing to areas of memory containing this program and data shall only be possible by the use of some special tool or code and shall not be possible during normal operation of the sounder.
Site-specific data shall be held in memory which will retain data for at least two weeks without external power to the sounder, unless provision is made for the automatic renewal of such data, following loss of power, within 1 h of power being restored.
Performance parameters under fire conditions
The sounder shall produce A-weighted sound pressure levels as declared by the manufacturer. The manufacturer may declare different sound pressure levels for operation under different conditions, for example, when operating on different voltage ranges or with different sound patterns. If this is the case the sound pressure level of each specimen shall be measured under each mode of operation (see 5.1.2). When tested in accordance with 5.3.1 the sounder shall produce A-weighted sound pressure levels of at least 65 dB(A) in one direction and the sound pressure level measured at each of the specified angles is not less than that declared by the manufacturer.
Frequencies and sound pattern This standard covers sounders which produce different frequencies and sound patterns and, therefore, does not specify a minimum and maximum frequency or specific sound pattern. The main sound frequency(ies),frequency range(s) and sound pattrn(s) shall be as declared by the manufacturer when tested as specified in 5.3.2.
NOTE Annex D gives information on some of the sound patterns and frequencies used in different European countries and on the intermational evacuation signal specified in ISO 8201.
Synchronisation Sounders may interact acoustically when they are installed in close proximity. To prevent this, sounders may have provision for synchronising warning signals and messages with that of other devices. If a synchronisation function is provided, it shall meet the compliance criteria of 5.3.3. When power interruption is used for synchronisation purposes, this shall not adversely affect the warning signal or the voice message.BS EN 54-3 pdf download.