The SICK EL4-P2638 is a cylindrical, retro-reflective photoelectric sensor that uses a visible red 660 nm light to detect targets by reflected beams. It covers a sensing range of 0.1 m to 3 m with a light spot of about 125 mm by 125 mm at 1 m, and it lists a PL80A reflector as a compatible option. The unit operates on 10 to 30 V DC and is commonly configured with a 4‑pin connection, cataloged under 1047826. This compact sensor is suited for reliable presence and edge-detection in automated setups where reflective targets are used.
