Allen-Bradley 42GDU-9204-QD8 Photoelectric Sensor

Allen-Bradley 42GDU-9204-QD8 PhotoSwitch photoelectric sensor is a polarized retroreflective device with built-in diagnostic capability for reliable detection of reflected targets in industrial environments. Part of Rockwell Automation's PhotoSwitch family, this 42GDU-9204-QD8 model provides a normally open output and operates on 90–264 V AC supply, enabling straightforward integration with standard factory power. With a sensing range of up to 4.87 m (16 ft) and polarized retroreflective sensing, it is suited for applications where a reflector establishes the sensing zone, such as part detection on conveyors, packaging lines, and automated assembly workflows. The diagnostic feature offers on-board status information to assist maintenance and troubleshooting, helping minimize downtime on production lines. This sensor’s specifications support reliable operation across typical industrial environments where consistent object detection is required for process control and automation tasks. Manufactured by Allen-Bradley (Rockwell Automation), this sensor aligns with standard industrial control architectures and is supported by Rockwell documentation and training resources.