The Keyence FU-38LK is a long-length, heat-resistant fiber optic unit engineered for stable and reliable detection in extreme-temperature environments. With its 250 °C (482 °F) heat resistance, durable construction, and extended fiber length, it offers manufacturers a versatile solution for applications where both endurance and flexibility are required.

A standout feature of the FU-38LK is its ability to withstand continuous high-temperature conditions up to 250 °C. This performance ensures reliable operation in environments such as metal processing, glass manufacturing, or heat treatment lines, where conventional fiber units would degrade or fail. By maintaining stability under thermal stress, the FU-38LK helps protect production quality and reduces downtime caused by sensor failure.

Unlike standard fiber optic units, the FU-38LK is equipped with a 2 m (78.74″) fixed-length fiber. The non-cuttable design preserves the structural integrity of the protective materials, ensuring consistent heat resistance and optical performance throughout its service life. The additional length provides greater flexibility in system design, allowing the sensor head to be mounted at safe distances from extreme heat sources while still maintaining accurate detection.

To further enhance installation flexibility, the FU-38LK features a minimum bend radius of R25 mm (0.984″). This enables the fiber to be routed around machine components or within complex equipment layouts without compromising its performance. By balancing flexibility with durability, the FU-38LK provides engineers with a practical solution for integrating sensors into high-temperature production lines.

The unit is designed to operate across a broad ambient temperature range of -40 to +250 °C (-40 to 482 °F), making it suitable not only for high-heat environments but also for low-temperature or fluctuating conditions. This adaptability ensures stable performance across diverse processes, from cryogenic storage to furnace-side monitoring.

Despite its rugged design and extended length, the FU-38LK is lightweight, with a total weight of approximately 70 g. This makes it easy to handle and reduces mechanical strain on connected sensor amplifiers, supporting long-term reliability without adding unnecessary load to the system.

Applications for the FU-38LK are varied and widespread. In automotive and aerospace industries, it supports heat-intensive processes such as metal curing or component hardening. In glass and ceramics production, it provides reliable detection near kilns or furnaces. In food and pharmaceutical industries, it withstands sterilisation and high-temperature cleaning environments, ensuring uninterrupted monitoring.

In summary, the Keyence FU-38LK is a robust, high-performance fiber optic unit designed for environments where both high heat resistance and extended reach are required. With its 250 °C rating, 2 m fixed length, flexible bend radius, and wide operating range, it offers manufacturers a dependable solution for detection in extreme conditions. For applications demanding durability, precision, and installation versatility, the FU-38LK is an outstanding choice.