FIELD: physics, signalling.
SUBSTANCE: invention relates to fire and security alarms. The self-contained fire alarm system comprises fire alarm units with heat sensors which are connected to a receiving device by a two-wire link. The heat sensor used is a thermojunction battery which acts at the power supply for the fire alarm unit. The fire alarm unit is a transformer self-contained generator of sinusoidal vibrations. Each channel of the receiving device uses a filter to select the frequency of the corresponding fire alarm unit and an electronic switch to facilitate flashing of an indicator with the number of the emergency facility.
EFFECT: simple design and low power consumption.
3 cl, 2 dwg
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