Keyence FU-40 Fiber Optic Sensor

The Keyence FU-40 is a 2‑meter fiber‑optic sensor that detects presence, position, or surface changes without contact, making it well-suited for tight spaces and small targets where standard photoelectric sensors struggle. It uses fiber‑optic light transmission and reception with a flexible multi‑fiber head and a 2‑meter cable, and provides a discrete digital output that is variant dependent (NPN or PNP) and typically powered from 12–24 V DC. LED indicators display power and output status, and the unit is designed for industrial environments with an appropriate protection rating and an industrial‑spec operating temperature range; mounting involves routing the fiber to the target area. Applications include manufacturing automation, packaging lines, conveyor systems, robotic cells, and inspection stations for non‑contact detection of small parts, presence, surface changes, or motion.