FIELD: pulse-code modulation equipment, alarm systems. SUBSTANCE: device has direct current power supply for feeding amplification circuit, grounding unit for detection of voltage potential between positive and negative terminals of direct current power supply, comparator which compares voltage potential to ground voltage, detector which detects control possibility using output level of comparator after detection duration and output of control signal if unbalance is detected. In addition device has display which displays alarm signal when control signal is received. EFFECT: increased functional capabilities. 5 cl, 5 dwg
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