Omron E3FA-BN21 is an NPN coaxial retro-reflective photoelectric sensor with a 500 mm sensing distance and an M12 connector. It works with a reflector, and its coaxial optics with the P-opaquing function help detect transparent objects such as bottles and films. The connector allows quick cable replacement without rewiring. It is part of the Omron E3FA Series. Explore more Omron photoelectric sensors.