The Keyence FU-35A Reflective Fiber Unit is a precision-engineered sensor accessory designed for applications that demand compact installation, high reliability, and dependable reflective detection. With its M3-sized body, the FU-35A is among the smallest fiber units available, making it particularly suited for machinery where space is at a premium or where sensors need to be installed in narrow gaps.

Employing a diffuse reflective detection method with a coaxial arrangement, the FU-35A ensures that light travels along the same optical path for both emission and reception. This configuration provides stable detection performance, minimizing errors caused by misalignment or angular displacement. It is especially effective for detecting small, irregularly shaped, or unevenly reflective objects, making it valuable in high-precision automation and quality control applications.

The fiber unit features a 0.5 m length and a straight design, offering simplicity in routing and integration. With a minimum bend radius of 25 mm, the FU-35A maintains reliable optical performance even when installed in constrained equipment layouts. Despite its small size, it achieves a detection distance of up to 20 mm, which is substantial for its class and supports a wide range of part detection and positioning tasks.

Designed for industrial reliability, the FU-35A operates under harsh environmental conditions, with a wide temperature tolerance from -40 to +70 °C. This resilience allows it to be used in environments where sensors are subject to extreme cold, heat, or fluctuating conditions. Its lightweight construction of just 5 grams further enhances ease of installation, reduces strain on mounting components, and makes handling straightforward.

The FU-35A reflects Keyence’s focus on miniaturization without compromise, providing strong performance in a sensor head that is both rugged and highly adaptable. Whether used in semiconductor production, electronics assembly, or other precision manufacturing processes, it delivers stable detection in compact and demanding setups.

In summary, the Keyence FU-35A is a compact, reliable, and environmentally resilient reflective fiber unit. With its coaxial diffuse reflective design, flexible installation capability, and durable performance in extreme temperatures, it is a versatile solution for precision detection in space-constrained and challenging industrial applications.