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Inductive Proximity Sensor,LJ12A34-Z/BX ,NPN,3-wire NO,diameter 12mm,Proximity Switch
Connect the wires in the following order by finger twisting the bare ends together and covering the bare connection with the small wire nut. The black common should be connected to the power feed common of the control power system. The brown wire will tied to the power feed voltage, 12VDC to 36 VDC, depending on the type of switch. The blue wire will be connected to the device that is being electrically controlled, usually a small electric relay.
LJ12A3-4-Z Datasheet