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871C Tubular Analog Sensors are self-contained, general purpose, solid-state devices designed to sense the presence of ferrous and nonferrous metal objects without touching them. These special versions provide a 0...10V sourcing analog output proportional to the sensing distance. 3-wire operation. 18…30V DC. 12 mm, 18 mm and 30 mm diameters. 2 m (6.5 ft) PVC cable connection. Short circuit, overload, reverse polarity, and transient noise protection