The EX-31B-PN is a mini photoelectric sensor from the UZB3 series designed for thru-beam detection with a screw fitting M4 connector. This sensor features a sensing range of 500 mm and can detect opaque objects as small as f2 mm with a repeatability of 0.05 mm or less, ensuring precise detection in industrial applications. The sensor operates on 12 to 24V DC supply with low current consumption (emitter: 10 mA or less, receiver: 15 mA or less) and includes both stability and operation indicator lights for easy monitoring. It is designed for simple installation into standard M4 mounting holes and is commonly used in production line automation, object detection, and positioning applications where reliable and accurate sensing is required.