KEYENCE FU-35FA Area Detection Fiber Optic Sensor
The FU-35FA is a high-performance, thru-beam fiber optic sensor head specifically designed for wide-area detection. Unlike standard point-type sensors, the FU-35FA emits a broad light curtain, making it exceptionally reliable for detecting falling workpieces, targets with varying positions, or vibrating components. Part of the Keyence FU series, this model combines a compact form factor with superior mechanical flexibility.
Technical Specifications
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Model: FU-35FA (Thru-beam type)
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Detection Width: 11 mm (0.43″)
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Fiber Unit Length: 2.0 m (Free-cut)
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Minimum Bend Radius: R2 mm (High-flex)
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Detecting Distance: Up to 1,600 mm (MEGA mode) / 800 mm (FINE mode)
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Minimum Detectable Object: ø0.2 mm opaque material
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Ambient Temperature: -40 to +70 °C
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Housing Material: Stainless steel and polybutylene terephthalate (PBT)
Reliable Area Sensing and High-Flex Technology
The FU-35FA is engineered to eliminate the «blind spots» often found in point-detection sensors. By creating an 11mm wide sensing area, it ensures that targets passing anywhere through the light curtain are captured accurately, which is critical for high-speed counting and presence verification.
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High-Flex Core: The «R2 mm» rating indicates a highly flexible fiber core that can withstand repeated bending cycles, making it suitable for mounting on moving robot arms or sliding carriers.
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Customizable Length: The 2-meter fiber cable is «free-cut,» allowing technicians to trim the cable to the exact length required for the machine layout using a standard fiber cutter.
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Stable Optical Axis: The precision-aligned lens system ensures a uniform light distribution across the entire 11mm width, maintaining high sensitivity even at maximum detecting distances.
Industrial Applications and Integration
The KEYENCE FU-35FA is widely utilized in automation for:
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Falling Object Detection: Monitoring parts as they drop from feeders or chutes.
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Web Break Detection: Monitoring the presence of continuous sheets or films across a wide path.
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Vibrating Target Detection: Ensuring stable signals for components that do not travel in a perfectly straight line.
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Amplifier Compatibility: Fully optimized for use with Keyence FS-N40, FS-N10, and FS-V30 series digital fiber optic amplifiers.
