The Telemecanique XUB9ANANL2 is a polarized retroreflective photoelectric sensor from the XU series, housed in a cylindrical M18 threaded body with a straight face. It emits a modulated light beam that bounces off a reflector (not included) and returns to the receiver; the polarizing filter rejects false reflections from shiny targets, making it suitable for detecting opaque or reflective objects at distances up to 2 m. Its NPN output switches dark-on (load energized when the beam is broken), sourcing up to 100 mA at 12-24 VDC. Built-in overload, short-circuit, and reverse-polarity protection reduce the risk of field failures from miswiring or overcurrent.
The sensing method—polarized retroreflective—is the standout: it ignores mirror-like surfaces that fool standard retroreflective sensors, so you can mount it near shiny machine frames without false triggers. The 2 m range is typical for this class, enough for conveyor chutes, door detection, or pallet presence in warehouse aisles. Switching frequency of 500 Hz means it can count parts up to about 500 per second; not for high-speed pick-and-place (that needs 1-2 kHz+), but fine for most packaging and material-handling lines. The NPN output is common in older PLC installations or relay logic; if your input card is PNP, you'll need a converter or a different model. Environmental sealing to IP65/IP67 covers washdown zones and dusty floors, but note it has no NEMA enclosure rating—don't bury it in a submerged pit. The prewired bare cable (2 m) saves a connector purchase but adds a permanent tail; if the cable gets cut, the whole sensor must be replaced.