FIELD: automatics; alarm signalling systems. SUBSTANCE: device has N main and N additional capacitive sensors number of which depends on number of protected objects. Additional sensor is arranged in circuit of corresponding main sensor in zone of action of fringe effect. Device has also switches, object code shaper, operational amplifier, driving element, voltage divider, frequency detector, low frequency filter, threshold unit, display unit and passive element. EFFECT: enhanced noise resistance, enlarged operating capabilities. 7 dwg
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