ISO 12239-2021 pdf free download – Smoke alarms using scattered light, transmitted light or ionization.
4.5Alarm condition4.5.1 Aural indicator
4.5.1.1 Signal temporal pattern
The smoke alarm aural signal temporal pattern shall be either:a) the emergency evacuation signal defined in ISO 8201, orb)the auditory danger signal defined in ISO 7731.
NOTE The selection of the signal temporal pattern is related to the installation requirement of the smokealarm and can be a requirement of national regulation.
4.5.1.2Signal sound pressure level – Optional function
The alarm condition aural indicator shall commence sounding at a level not greater than 45 dBA, risinggradually to the maximum level of not more than 105 dBA over a period of between 3 s to 10 s (see 5.18and 5.19).
4.5.1.3 Signal frequency characteristics – Optional function
The audible alarm signal shall have a fundamental frequency of 520 Hz with odd harmonics toapproximate a square wave.
4.5.2 Visual indicators
4.5.2.1 Interconnectable smoke alarms – Optional function
Interconnectable smoke alarms shall be provided with an integral red visual alarm condition indicator,by which the smoke alarm, when in alarm condition, may be identified.The indicator shall flash or becontinuously illuminated when the alarm condition is present. Visual indicators shall not operate oninterconnected smoke alarms that have not detected smoke. This visual indicator may also performother additional functions, but the alarm condition indication needs to be distinct from any additionalfunction.
4.5.2.2 Non-interconnectable smoke alarms
Smoke alarms that do not include an interconnection function shall be provided with an integral redvisual alarm condition indicator. The indicator shall flash or be continuously illuminated when the alarm condition is present.The indicator may be combined with the fault condition visual indicator.The failure of any visual alarm condition indicator shall not prevent the alarm condition.
4.6External main power source-on visual indicator
A smoke alarm intended for connection to the mains or mains derived supply shall be provided with anintegral green visual indicator. The indicator shall be continuously illuminated when the external mainpower is present. The failure of any visual external main power source-on indicator shall not preventthe alarm condition.
4.7Fault condition visual indicator – optional function
The smoke alarm shall be provided with an integral amber or yellow visual fault condition indicator.Theindicator shall flash or be continuously illuminated when the fault condition is present.The indicatormay be combined with the alarm condition visual indicator. The failure of any visual fault conditionindicator shall not prevent the alarm condition.
4.8Visual indicator visibility
All visual indicators shall be visible from a distance of at least 1 m and from at least one point when thesmoke alarm is mounted in an ambient light intensity of 500 lux.
4.9Smoke alarm signals
The following conditions shall apply to smoke alarms which employ features in addition to therequirements of this document:
– The audible alarm signal shall take precedence over any other signal, even when such other signal
is initiated first.
The audible alarm signal shall be distinctive from the signals of non-alarm condition functions. Useof a common sounder is permitted if distinctive signals are obtained.
lf an audible fault condition signal is provided, it shall be distinctive from the audible alarm signalbut may be common to all functions employed.
Any fault condition associated with features, in addition to the requirements of this document, shallnot interfere with the operation and supervision of the smoke alarm.
4.10 Test facility
A test facility shall be provided to simulate the response of the sensing assembly to detect the presenceof smoke.The test facility may be integral to the smoke alarm enclosure or remote to the smoke alarm.The test facility shall be accessible from outside the smoke alarm when installed as specified in theinstallation instructions. Where the test facility is remote from the smoke alarm, it shall have thesame functionality as the test facility integral to the smoke alarm itself and be labelled to identify thefunction of the control.
4.11 Means of calibration
The means of calibration shall not be readily adjustable after manufacture.
4.12 User-replaceable components
Except for batteries or fuses, a smoke alarm shall have no user-replaceable or serviceable components.ISO 12239 pdf download.