The Leuze DB112 UP.1-20,2500 (Part Number: 50109000) is a high-precision ultrasonic sensor head designed for double sheet and splice inspection belonging to Leuze electronic's specialized Series 112 (Germany). Operating as an opposed pair of M12 acoustic transducers connected directly to an evaluation amplifier (such as the Leuze VDB 112 series), this sensor delivers foolproof sheet-feed monitoring to eliminate misfeeds, machine jams, and print quality defects caused by multi-sheet feed errors.

KEY PRODUCT FEATURES AND OPERATIONAL ADVANTAGES:
1. High-Frequency Ultrasonic Transmission – Universal Material Independence:
Utilizing ultrasonic wave attenuation across passing sheets, the sensor evaluates real-time mass density variations between single sheets, double sheets, and zero-sheet conditions. It reliably inspects ultra-thin 20 g/m² airmail paper up to 1,200 g/m² heavy cardboard, transparent and opaque polymer films, PVC plastic cards, and metallic aluminum foils where optical inspection systems fail.
2. Ultra-Short M12 Cylindrical Housing (Only 20 mm Body Length):
Features an ultra-compact M12x1 mm threaded barrel measuring just 20 mm in total length. This miniature form factor allows effortless integration directly into gripper bars, sheet feed tables, and constrained roller nips where space is strictly limited.
3. Dependable 15 mm to 30 mm Operating Range:
Provides a guaranteed 15 mm to 30 mm operating clearance between opposed ultrasonic sensor heads, allowing fast-moving paper, cardboard, and web sheets to pass freely without mechanical edge friction or surface scratching.
4. 100% Immune to Color, Dust, and Surface Sheen:
Ultrasonic measurement is entirely unaffected by dark ink densities, complex multi-color print patterns, foil reflections, or paper dust accumulation, ensuring continuous 24/7 production reliability.
5. Flexible 2.5m Pigtail Cable with M8 3-Pin Connector (-20,2500):
Equipped with a 2,500 mm (2.5 m) high-flexibility cable terminating in an industry-standard metal 3-pin M8 male connector, enabling clean cable routing and quick plug-and-play connection to the VDB 112 amplifier.
6. Rugged Nickel-Plated Brass Barrel – IP65 Protection:
Constructed with a precision-machined nickel-plated brass body engineered to withstand continuous mechanical shock and intense machine vibration on high-speed press lines. Rated IP65 for dust and moisture resistance.

TYPICAL INDUSTRIAL APPLICATIONS:
• Industrial Printing Presses (Offset, Digital, Flexo): Infeed single-sheet presence and double-sheet prevention, protecting delicate printing cylinders and cutting dies.
• Post-Press Folding & Bookbinding Machinery: Sheet count monitoring and signature integrity checking before saddle stitching or perfect binding.
• Packaging & Box Folding Machines: Infeed blank monitoring on high-speed carton folder-gluers and die-cutters.
• Plastic Card & Foil Converting Lines: Automated feed verification of SIM cards, credit cards, blister pack foil webs, and laminated pouch films.

• Manufacturer: Leuze electronic
• Part Number / Model: DB112 UP.1-20,2500 (DB 112 UP.1-20,2500)
• Order Number (Part no.): 50109000
• Series: Series 112 (Ultrasonic Double Sheet Inspection)
• Brand Origin: Germany
• Device Type: Ultrasonic sensor head for double sheet inspection
• Compatible Evaluation Amplifier: Leuze VDB 112 Series (e.g., VDB 112/4, VDB 112/2.3)
• Physical Principle: High-frequency Ultrasonics
• Application: Double sheet / splice inspection
• Target Materials: Paper, cardboard, plastic films, aluminum foil, PVC cards
• Paper Weight Range: 20 g/m² (thin paper) ... 1,200 g/m² (cardboard)
• Guaranteed Operating Range: 0.015 ... 0.03 m (15 mm – 30 mm separation between transmitter & receiver)
• Housing Design: Ultra-short cylindrical threaded
• Housing Dimensions (Diameter x Length): Ø 12 mm x 20 mm
• Thread Size: M12 x 1 mm
• Housing Material: Nickel-plated brass
• Connection Type: 2,500 mm (2.5 m) cable with M8 connector, 3-pin male
• Net Weight: 30 g
• Ingress Protection: IP 65
• Protection Class: Class III
• Ambient Operating Temperature: 0 °C ... +60 °C
• Storage Temperature Range: -40 °C ... +70 °C
• Standards & Certifications: IEC 60947-5-2, cULus Listed