SMC MQQLB20-40D Photoelectric Sensor Through Beam 2m Cable

SMC MQQLB20-40D is a through-beam photoelectric sensor from SMC that uses a separate emitter and receiver to detect object presence via beam interruption, delivered with a pre-wired 2 m cable for quick installation. In a through-beam configuration, the emitter projects a focused infrared beam to the receiver, and any interruption signals a change in the receiver’s output, making it suitable for conveyor lines, part-detection in automation cells, and end-of-line sensing. The MQQLB20-40D belongs to SMC’s MQQLB family of through-beam sensors, engineered for reliable performance in industrial environments where precise, non-contact detection is required along a defined sensing path. Typical applications include verifying that packages or parts are in position on a production line, triggering downstream machinery, or serving as a presence sensor in pick-and-place and packaging systems. With a 2 m pre-wired cable, this model minimizes wiring effort and simplifies mounting in tight spaces, while supporting integration with standard control systems that accept through-beam sensor outputs. This combination of compact form, dedicated beam path, and factory-floor compatibility makes the MQQLB20-40D a practical choice for manufacturers seeking straightforward, non-contact detection across a defined sensing zone.