Keyence FU-77G Fiber Unit – Thrubeam Type for Precision Detection
The Keyence FU-77G is a thrubeam fiber unit built for accurate object detection in tight spaces. Its ø1.13 mm optical axis suits small target sensing. The M4 threaded shape allows secure mounting. A 1 m fiber length gives flexible installation. This unit works in temperatures from -40 to +50 °C. It is ideal for industrial automation, electronics, and packaging lines.
Technical Specifications
- Brand: Keyence
- Model: FU-77G
- Type: Thrubeam fiber unit
- Optical axis diameter: ø1.13 mm (0.04″)
- Size: M4
- Fiber unit length: 1 m (3.28 ft), cut not allowed
- Shape: Threaded
- Minimum bend radius: R10 mm (R0.39″), stainless steel
- Ambient temperature: -40 to +50 °C (-40 to 122 °F)
- Weight: Approx. 39 g
Note: Measurement range, frequency response, sensitivity, linearity, resolution, and anti-interference depend on the paired amplifier. The FU-77G is a passive fiber unit. It does not contain active electronics. For full system specs, refer to the compatible Keyence amplifier datasheet.
Installation Guide
- Mount the M4 threaded head into a standard bracket.
- Keep the bend radius above R10 mm.
- Avoid sharp bends or pulling the fiber.
- Do not cut the fiber. The 1 m length is fixed.
- Connect the fiber to a compatible Keyence amplifier.
- Align the thrubeam pair for stable detection.
Commissioning and Maintenance
- Clean the fiber tips with soft cloth and alcohol.
- Check for dust or oil on the optical axis.
- Verify alignment after machine adjustments.
- Replace the unit if the fiber jacket is damaged.
- No internal calibration is needed. The amplifier handles gain and threshold.
Compatibility
The Keyence FU-77G works with Keyence fiber amplifiers such as the FS-N series, FS-V series, and other standard Keyence fiber amplifier modules. It uses a standard fiber connection. It is a direct replacement for many obsolete thrubeam fiber units in the same class.
Certifications and Compliance
This unit follows Keyence global quality standards. It is RoHS compliant. It meets typical industrial EMC and safety requirements when used with a certified amplifier. Contact us for specific certificate copies.
Package List
- 1 x Keyence FU-77G fiber unit
- 1 x Protective packaging
- Not included: amplifier, mounting bracket, screws
Warranty and Shipping
All orders include a 12-month warranty. We ship via FedEx, UPS, and DHL. Tracking is provided. Orders ship within 1–2 business days after payment and verification.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support to your door.
- Tested industrial surplus and refurbished options.
- 12-month warranty on every unit.
- Technical verification before shipment.
- Support for obsolete control systems.
Contact us for inquiries: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
Typical Applications
- Small part detection on assembly lines
- Label and edge sensing in packaging
- Semiconductor and electronics inspection
- Medical device manufacturing
- Automotive component verification
Diagnostic Capabilities
The FU-77G works with Keyence amplifiers that offer self-diagnosis. These amplifiers can detect unstable light levels, misalignment, and contamination. The fiber itself has no active diagnostics. System health depends on the paired amplifier.
FAQ
Q: Can I cut the fiber to a shorter length?
No. The FU-77G is 1 m and cannot be cut.
Q: What amplifier should I use?
Use any compatible Keyence fiber amplifier. Common models include FS-N and FS-V series.
Q: Is the FU-77G waterproof?
No. It is not rated for liquid immersion. Keep it dry.
Q: What is the smallest object it can detect?
It depends on the amplifier. The optical axis is ø1.13 mm. It detects targets near that size.
Q: Does it come with a mounting bracket?
No. Bracket and screws are sold separately.
SEO Meta Description
Keyence FU-77G thrubeam fiber unit, M4 threaded, 1 m, ø1.13 mm optical axis. For small part detection. 12-month warranty. Ships via FedEx, UPS, DHL.
SEO Titles
Title 1: Keyence FU-77G Fiber Unit Thrubeam M4 1m – Oiltech Controls
Title 2: FU-77G Keyence Thrubeam Fiber Sensor – 12-Month Warranty
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