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D12DAB6 Series sensors are compact, ac-coupled sensors designed for use with Banner glass or plastic fiber optics. They are intended for applications in which the light signal change is so small that sensitivity adjustment of ordinary dc-coupled sensors is difficult or impossible. D12DAB6 Series sensors can respond to even smaller signal changes than the standard D12 fiber optic sensors, and are less affected by gradual signal changes due to dirt buildup, etc. Typical applications include thread break detection, web flaw detection, and detection of small parts falling randomly from vibratory feeders or small presses.