FIELD: physics.
SUBSTANCE: invention relates to the field of controlled area protection. Security alarm device includes two types of detectors connected in series with one signal line to a receiving-control device. Each type of the detector is designed to operate in its own zone of the protected perimeter. Detector of the first type is configured to generate a single pulse signal with duration of 0.5 to 4 seconds. Detector of the second type is configured to generate two consecutive pulse signals, first from 0.3 to 0.5 seconds and second from 0.5 to 4 seconds.
EFFECT: technical result consists in improvement of noise immunity of protection system and simultaneous provision of possibility of distinguishing zone, in which triggered detector from group of annunciators.
5 cl, 5 dwg
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