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Inductive Proximity Sensor Switch – LJ12A3-4-Z/BX NPN The Inductive Proximity Sensor Switch – LJ12A3-4-Z/BX NPN, also known as non-contact proximity switch are used for non-contact detection of metallic objects. The operating principle is based on a coil and oscillator that creates an electromagnetic field in the close surroundings of the sensing surface. The presence of a metallic object (actuator) in the operating area causes a dampening of the oscillation amplitude. Specifications : Operating Voltage : DC 6-36V range within Universal Output Type : NPN normally open three-line Detection object : metal objects Detection distance : 4 mm Output Current : 300 mA Response Frequency : 0.5KH Temperature range : -25℃ to + 60℃ within + (-) 10% detection distance Dimensions : 12 mm screw diameter Cable length : about 115 cm Material : Metal and plastic