Abus FURM50000 Mode D'emploi page 47

Warning
All optical smoke detectors which work in this way have the following problems:

They do not detect radiant heat.

They do not detect heated air.

Other forms of particles can imitate smoke or cause light to be dispersed (e.g. dust, water droplets,
insects or steam)

They are unable to detect smoke if air movement around the detector is restricted.
However, the benefits of optical smoke alarm devices are:

They are robust and reliable.

They do not require large and expensive batteries.
Acoustic alarm
The smoke alarm device
(A) at a distance of 3m from the detector.
The volume of the alarm sound is reduced by:

the distance from the detector

closed doors

thick curtains

locating the detector behind furniture or other objects
Radio signal
The smoke alarm device transmits a radio signal at 868.6625 MHz. This frequency is within the European
harmonised frequency band for alarm signalling. These radio signals are designed for compatible ABUS
alarm control panels and receivers. Radio signals from smoke alarm devices can be absorbed and
EN
uses a piezoelectric sound source, which generates a volume of at least 85 dB
17 EN