The Siemens 3RG7401-0HH52 is a SIMATIC PXO320 K20 retro reflective sensor sized for detecting transparent objects. It runs on DC 10-30V, has a sensing range of 50 cm, and outputs NPN with light/dark-on programming selectable. Rated at 100 mA, it's cabled with 2 meters of PUR-jacketed 4x0.14 mm² wire and sealed to IP67.
The 50 cm retro reflective range is specific to transparent object detection — standard retro sensors may not trigger reliably on clear materials. The NPN output and 100 mA load limit match most PLC digital inputs; the 10-30V DC supply covers 24 V nominal panels. IP67 lets it live on a conveyor frame or in a washdown zone without a secondary enclosure.