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proximity sensor

Device to determine location of an object, usually for the purpose of automation. Often consists of a magnet and a voltage detector. For an automatic wagon tracking system, sensors might be placed in the onstage "playing" position and the offstage "storage" position.

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Allen-Bradley Sensors

Similar devices are found inside moving lights, to determine "home" positions of color and gobo wheels, pan and tilt ranges, et cetera.

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