Pepperl + Fuchs' ML8 photoelectric sensors
ML8 Series photoelectric sensors (31mm x 11mm x 23mm) offers tamper-proof construction to eliminate setting adjustments by unauthorized users. They have high ambient light immunity (40 klux) and provide a sensing range of up to 2.5 meters making them suited for conveying applications and over-sidewall sensing. LEDs provide sensor output status and are visible from the front and rear of the sensor. Sensing modes include diffused and polarized retro-reflective.