FIELD: fire safety.
SUBSTANCE: in the device the second signal sensor is added, located at the side of the supply mains, a capacitor is located between the junction point of the sensors and the wire of supply neutral, a comparator of sensor pulses that determines the localisation of the signal source, and the generating pulse of blocking initialisation with the polarity determined by this localisation. The unit of pulse shaping of blocking, interrupting in the signal localisation from the external net the formation of the accumulative pulse and blocking the possibility of its formation for a time sufficient for attenuation of the input pulse, and a unit of blocking pulse inhibit, where the inhibit is initiated by accumulative pulse and is carried out with a delay, the duration of which is less than the initialisation pulse duration of signal blocking, but greater than its time of rise.
EFFECT: increase in interference immunity to the effects of the chains adjacent to the protected chains of the device.
2 cl, 5 dwg
