The Leuze GSU 14D/66.3-S12 (Part Number: 50126781) is a high-performance ultrasonic fork sensor from Leuze electronic's proven Series 14 (Germany). Engineered with acoustic transmission principles, this sensor measures acoustic attenuation through passing materials, delivering universal label detection completely unaffected by transparency, color patterns, metallization, or surface sheen.

KEY PRODUCT FEATURES AND OPERATIONAL ADVANTAGES:
1. Ultrasonic Measurement Principle – 100% Color & Transparency Independence:
Ultrasonic waves transmit through the carrier web and label, detecting mass density differences between labels and backing web gaps. It reliably detects transparent clear-on-clear labels, metallic foil labels, multi-colored printed labels, and thick multi-page booklet/leaflet labels where conventional optical sensors fail.
2. Optimized Fork Dimensions (4 mm Mouth Width, 68.5 mm Depth):
Features a 4 mm mouth gap and a deep 68.5 mm throat depth, allowing wide label webs, folded booklets, and thick carrier tapes to glide smoothly without mechanical edge jamming.
3. Ultra-Fast 240 m/min (4 m/s) Web Speed & 0.2 ms Response Time:
With an ultra-fast response time of 0.2 ms (200 µs) and support for conveyor speeds up to 240 m/min, it ensures precise, zero-drift label dispensing and cut synchronization on high-throughput automated packaging equipment.
4. Versatile Teach-in: Integrated Teach Button & Remote Teach Input (.3):
Supports fast dynamic teach-in while the label web moves at up to 50 m/min, as well as static teach-in via an onboard push button. The integrated remote Teach input (Pin 5) allows automated recipe changeovers directly from the PLC/HMI without manual adjustments.
5. Dual Universal Push-Pull Digital Outputs (/66):
Equipped with two independent Push-pull switching outputs (PNP/NPN universal), ensuring seamless integration into all standard industrial PLC control platforms.
6. Rugged Diecast Zinc Enclosure – IP65 Ingress Protection:
Built with a heavy-duty diecast zinc housing finished in durable red and black powder coat, resisting harsh mechanical shocks, vibration, and dust accumulation with an IP65 protection rating.

TYPICAL INDUSTRIAL APPLICATIONS:
• High-Speed Automated Labeling Machines: Precise label dispensing and edge detection on beverage bottles, containers, and cosmetic packaging.
• Pharmaceutical Packaging Lines: Detection of booklet labels, instruction leaflets, and multi-layer clinical peel labels on vials and blister packs.
• Printing & Converting Machinery: Web splice detection on continuous paper and polymer rolls for automated splicing routines.
• Food & Confectionery Packaging: Foil packaging seal registration and transparent film alignment on flow-wrapping machinery.

• Manufacturer: Leuze electronic
• Part Number / Model: GSU 14D/66.3-S12
• Order Number (Part no.): 50126781
• Series: Series 14
• Brand Origin: Germany
• Device Type: Ultrasonic forked sensor for label detection
• Physical Principle: Ultrasonics
• Mouth Width (Fork opening): 4 mm
• Mouth Depth: 68.5 mm
• Minimum Label Dimensions: Label width ≥ 10 mm, Label length ≥ 5 mm
• Minimum Label Gap: ≥ 2 mm
• Detectable Media: Transparent (Clear-on-Clear), Non-transparent, Metallic/Foil, Booklet/Leaflet labels
• Max. Conveyor Speed (Operation): ≤ 240 m/min (4 m/s)
• Max. Conveyor Speed (Teach-in): ≤ 50 m/min (0.83 m/s)
• Response Time: 0.2 ms (200 µs)
• Readiness Delay: 300 ms
• Operational Controls: Onboard Teach button + Remote Teach input
• Supply Voltage (UB): 12 ... 30 V DC (Residual ripple 0 ... 15%)
• Open-Circuit Current: 0 ... 80 mA
• Teach Input: 1 DC input (High ≥ 8V, Low ≤ 2V, input resistance 15,000 Ω)
• Digital Switching Outputs: 2 independent outputs
• Switching Output Type: Transistor Push-pull
• Max. Switching Current: 100 mA
• Output Switching Voltage: High ≥ (UB - 2V), Low ≤ 2V
• Protective Circuits: Polarity reversal protection, short-circuit protection
• Status Indicators: 3 LEDs for power, switching output, and teach status
• Connection Type: M12 metal connector, 5-pin male (A-coded, horizontal plug outlet parallel to belt movement)
• Dimensions (W x H x L): 20.7 mm x 48.2 mm x 101 mm
• Net Weight: 270 g
• Mounting Type: Through-hole mounting or integrated mounting thread
• Housing Material: Diecast zinc
• Housing Colors: Red RAL 3000 / Black RAL 9005
• Ingress Protection: IP 65
• Protection Class: Class III
• Ambient Operating Temperature: 0 °C ... +60 °C
• Storage Temperature Range: -40 °C ... +70 °C
• US Patent: US 6,314,054 B
• Standards & Certifications: IEC 60947-5-2, cULus Listed