- Heat resistant temperature: 105°C 221°F*1
- Fibre unit length: 2 m78.74″ free-cut
- Fibre unit diameter: √∏2.2√ó2
- Minimum bend radius: R25 mm0.984″
- Minimum detectable object: Gold wire with a diameter of 0.005 mm0.0002″ *2
Free Shipping: $50+ U.S. orders | $350+ International orders
12-Month Warranty
Hassle-Free Returns Within 30 days
Over 100,000 parts in stock
- Brand: Keyence
Keyence FU-85 Fiber Optic Sensors, Reflective Fiber Unit
Mfr # FU-85
$244.97
/ea
Availability: Available to Order|Typically ships within 7 to 10 business days. Lead time may vary based on supplier availability.
- Free shipping on U.S. orders over $50 and international orders over $350.
- Hassle-Free 30-Day Returns.
- 12-Month Warranty for all products.
- Get 10% off—join our email list.
Accepted Payments
- High Heat Resistance: Withstands temperatures up to 105°C (221°F), making it suitable for harsh environments.
- Ultra-Fine Detection Capability: Capable of detecting objects as small as a gold wire with a diameter of just 0.005 mm (0.0002″).
- Flexible Installation: Features a 2 m free-cut fiber length with a diameter of Ø2.2 x 2, allowing for adaptable placement in various setups.
- Durable and Compact Design: Offers a minimum bend radius of R25 mm (0.984″), ensuring reliable performance without compromising structural integrity.
The Keyence FU-85 Reflective Fiber Unit is engineered for applications that demand both precision and durability in high-temperature environments. Designed with advanced fiber optic technology, this unit is ideal for detecting ultra-small objects in challenging conditions, such as those encountered in electronics manufacturing, precision assembly, and semiconductor processes. Its ability to maintain reliable performance at temperatures up to 105°C (221°F) ensures consistent operation even in areas where conventional sensors may fail due to heat stress.
One of the standout features of the FU-85 is its exceptional detection capability. The sensor is specifically designed to identify extremely fine objects, including gold wire with a diameter as small as 0.005 mm. This makes it a crucial tool in industries where miniature components are involved, such as microelectronics, medical device production, and fine mechanical assembly. Its precise detection ensures accurate monitoring, quality control, and reduced risk of overlooked defects in critical processes.
In terms of installation, the FU-85 offers a 2-meter free-cut fiber length with a fiber diameter of √∏2.2 √ó 2. This provides engineers and technicians the flexibility to customize the length to suit specific applications, enhancing integration into existing systems. Its minimum bend radius of 25 mm also contributes to easier routing, even in confined or complex layouts, while preserving performance integrity and signal stability.
Durability is another defining characteristic of the FU-85. Built to withstand tough operating environments, the robust fiber design ensures long-term reliability under continuous use. The unit’s heat resistance, coupled with its fine detection capability, allows it to excel in demanding conditions where both precision and resilience are non-negotiable. These attributes make it an excellent choice for manufacturers seeking consistent high-quality output without interruptions caused by sensor limitations.
Overall, the Keyence FU-85 Reflective Fiber Unit represents a combination of precision, flexibility, and durability. By offering ultra-fine detection in high-temperature environments, it addresses the critical needs of industries requiring reliable, high-performance sensing solutions. Whether used in semiconductor fabrication, electronics inspection, or advanced manufacturing, the FU-85 delivers consistent accuracy and operational efficiency, ensuring that production lines run smoothly with uncompromised quality assurance.
Product Specifications
| Manufacturer | Keyence |
|---|
We’re Always Ready to Assist You
Submit A Request
Reach us through our form.
Give Us A Call
Connect with a representative.
Live Chat
Chat live with our support team.

Reviews
There are no reviews yet.