KEYENCE FU-77TZ FU Series Thru‑beam Fiber Optic Sensor Unit

KEYENCE FU‑77TZ is a compact thru‑beam fiber optic sensing head for non‑contact detection of small parts and objects in industrial automation systems. Its M4 hex‑shaped design and 2 m ToughFlex cable are intended for installation in constrained machinery environments while maintaining stable, high‑precision detection. The fiber unit is rated for wide‑temperature operation and is used as a peripheral sensing element with a compatible KEYENCE fiber amplifier (FS‑N, FS‑V series) which generates, receives and evaluates the optical signal.

Applications:

• Position detection of miniature components in pick‑and‑place systems

• Object presence verification on high‑speed conveyor and sorting lines

• Parts counting and quality inspection in electronics and semiconductor manufacturing

• Positioning tasks in packaging machinery requiring small sensing heads

Core Specifications:

• Sensing mode: Thru‑beam (transmissive)

• Optical axis diameter (standard target): ø1.13 mm

• Thread size: M4

• Fiber unit length: 2 m, free‑cut

• Fiber unit diameter: ø2.2 mm

• Shape: Hex‑shaped

• Minimum bend radius: R2 mm (ToughFlex)

• Cable type: ToughFlex (high‑flex, durable jacket)

• Weight: approx. 25 g

Advanced Specifications:

• Ambient operating temperature: –40 °C to +50 °C

• External protective covering: stainless steel (ruggedized)

• Housing material: Stainless steel outer case

System Integration:

• This fiber unit belongs to the KEYENCE FU series of fiber optic sensors.

• Designed for use with KEYENCE FS‑N, FS‑V and compatible fiber amplifiers which supply light and process the return signal.

• The M4 threaded hex‑shaped head allows single‑screw mounting in tight spaces.

• The free‑cut 2 m fiber cable can be trimmed to exact length for cable management in confined machinery.

• The cable can be routed with a minimum bend radius of R2 mm, preserving optical performance under mechanical stress.

• For detailed installation and wiring instructions, refer to the product hardware manual and the respective fiber amplifier documentation.

Environmental & Compliance:

• Rated IP67 (when used with appropriate fiber amplifier and correct installation)

Related Products:

• FS‑V30 series – Digital fiber amplifier (compatible amplifier)

• FS‑N series – Digital fiber sensor amplifier main unit

• FU‑R77TZ – Indicator light type thrubeam unit

• FU‑77TG – Stainless steel jacket thrubeam unit (standard)