Edge detection FC3 Series

Datasensing FC3 Series

The FC3 Series offers a high-performance family of fork-type photoelectric sensors, engineered specifically for reliable detection of web edges, belts and leading/trailing edges of materials in high-precision industrial automation. With a dual-beam design, selectable output logic (Light-On/Dark-On), and output types including TRIAC or MOSFET, the FC3 delivers repeatable edge detection, high immunity to dust, and straightforward integration into machine systems.

Design & Functionality

• The FC3 sensor uses a two-beam arrangement at 6.8 mm inter-beam spacing, designed to ensure consistent edge sensing regardless of web color or surface variations. 
• Key design features include:
  • Selectable Light-On / Dark-On mode by reversing supply polarity, making installation and logic configuration simple. 
  • Solid-state output: TRIAC type for the FC3 variant, or MOSFET for FC3/A variant, delivering robust load switching up to 110 V AC or 30 V DC. 
  • Wide voltage input range (10–30 V DC) ensures flexibility across control systems. 
  • High resistance to dust and contamination, making it suitable for industrial web conveyors and belt systems. 
• The FC3 is especially useful for web-edge detection, belt-centre guidance, sheet transitions, and any application where the edge position must be tracked precisely.

   Important: With its dual-beam 6.8 mm spacing and selectable output logic, the FC3 Series delivers stable edge detection even on coloured or textured belts.

Total Crossed Beams

(Adapted for the dual beam fork sensor concept)

• The FC3’s two optical beams cover the web’s edge zone, creating a reliable detection region that tracks motion and reduces jitter errors.
• This results in high repeatability, fewer false triggers, and improved performance in dynamic systems.

Beam Pitch Options

(Here interpreted as spacing and geometry of the two beams)

• The FC3 maintains a fixed beam spacing of 6.8 mm designed for edge tracking. 
• Different variants may offer differing slot depths or housing lengths to suit various web widths or mounting positions.

   Important: The 6.8 mm inter-beam spacing is optimised for edge-detection applications and supports reliable sensing of belt edges, perforations or webs.

Intrinsic Synchronism

• The FC3’s emitter and receiver beams are built into one fork body, ensuring fixed alignment and no need for manual optical calibration.
• Enables quick installation and minimises maintenance or alignment drift over time.

Operational Advantages

• Precise edge detection on webs, belts and sheets.
• Selectable output mode (Light-On/Dark-On) simplifies logic integration.
• Industrial robustness: solid state outputs, dust-resistant housing, wide voltage range.
• Excellent repeatability thanks to dual beams and fixed spacing.
• Applications: Web alignment in printing and converting machines, belt tracking, edge guidance on conveyors, sheet leading‐edge detection, automated material feeding systems.