The SICK WLA16P-24162100A00 is a photoelectric retro-reflective sensor from the W16 family, rated for a 10 m sensing distance with a visible red PinPoint LED. It outputs NPN, PNP, or push-pull signals selectable via wiring, and switches in 500 µs — fast enough for counting or positioning on a moderate-speed conveyor. The M12 4-pin connector mates directly to standard breakout cables; no pigtail splicing required.
The 20 mm wide housing fits standard 20 mm mounting brackets, and the IP66/IP67/IP69 rating means this sensor survives high-pressure washdown (up to 80 bar at 80 °C per IP69K test conditions) — suitable for food-and-beverage or car-wash lines. Operating temperature spans -40 °C to +60 °C, so it works in cold storage or near ovens without derating.