Request InfoSICK Inc.The WTB4 multiline photoelectric sensor from Sick Inc. uses specially designed optics to create two line-shaped light spots to continuously detect objects with large gaps, such as PCBs, or products that are shiny or dark from leading edge to trailing edge. It is suitable for a variety of packaging and semiconductor applications. To activate the output, both light sources must reflect light back to the sensor. Once both light sources have returned, the sensor will remain active, even if one of the beams is not returned. 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