FIELD: signal systems for detection of oil leakage from pipe lines. SUBSTANCE: device has cable with two spiral conductors which are split by insulation to provide screw-shaped space between them. In addition device has detectors and alarm unit. Detectors operate by feature of special materials, in particular, butadiene-styrene or ethylene-propylene rubber, to increase its volume and length by several times. EFFECT: simplified design. 4 cl, 6 dwg
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