The Keyence FS-L40 is a diffuse reflective fiber sensor head engineered for general-purpose detection tasks requiring high accuracy, compactness, and reliability. Designed with a cable length of 1.9 m, it offers flexibility in installation, making it well-suited for applications in assembly automation, electronics manufacturing, packaging, and quality inspection systems.

At the core of its capability is the wide detection distance range of 30 to 150 mm, allowing the FS-L40 to detect both medium-sized objects and very small targets. The standard detection object used in specifications is white matte paper (4 mm²), which reflects consistent light levels for stable detection. Beyond standard materials, the FS-L40 demonstrates its precision by reliably identifying extremely fine targets such as 0.1 mm diameter copper wire, making it suitable for industries that handle miniature components and fine assembly lines.

The sensor achieves this performance with a spot size of 4 mm or less, ensuring that only the intended detection area is monitored. This small spot sensing ability enhances detection accuracy in tightly packed machinery or when distinguishing between closely spaced parts. Combined with a hysteresis of 10% or less within the detection range, the FS-L40 minimizes false detections and maintains consistent operation.

Durability is another key advantage of the FS-L40. The transmitter side is constructed with glass fiber covered in PVC, while the receiver side uses plastic fiber with a polyethylene covering, ensuring resilience against bending, environmental stresses, and long-term wear. The allowable bending radius of R30 mm makes the unit flexible enough for routing through compact installations without performance degradation. Weighing only about 30 g, it remains lightweight yet durable.

The environmental specifications further emphasize its reliability, with an operating temperature range of 0 to +60 °C and a humidity tolerance of 35 to 85% RH without condensation. This enables the sensor to function stably in typical industrial environments, whether on fast-moving production lines or in assembly equipment.

The FS-L40 is designed to integrate seamlessly with Keyence’s amplifier units, allowing operators to take advantage of advanced tuning and control options for stable detection. Its compact design and high-performance optical characteristics make it a versatile choice for detecting reflective surfaces, small objects, and components where space and precision are critical.

In summary, the Keyence FS-L40 Reflective Sensor Head provides an ideal balance of compact design, wide detection range, small-spot precision, and rugged fiber construction. These qualities make it a trusted solution for industries that demand both durability and accuracy in compact sensing applications.