The Pepperl+Fuchs NBB20-U1-A2-T is a robust inductive proximity sensor engineered for precise non-contact detection of metal objects in industrial automation. With a 20 mm rated operating distance (flush mounting) and a bidirectional, rotatable sensor head, it enables flexible alignment and accurate positioning in compact or complex setups. The 4-wire DC PNP output offers complementary switching (NO/NC configurable), operating seamlessly across a 10–30 V DC range with reverse polarity and pulsing short-circuit protection. Four 360° visible LEDs—green for power and yellow for switching state—provide intuitive real-time diagnostics, while a 440 Hz switching frequency and 5% hysteresis ensure stable performance in high-speed applications like conveyor systems, robotic arm positioning, and part counting.
Built to withstand harsh conditions, the NBB20-U1-A2-T features a durable PA/metal housing with an epoxy powder coating, resisting corrosion, impact, and vibration. Its IP68/IP69K protection rating ensures full dustproof and waterproof performance, capable of enduring high-pressure jet cleaning and prolonged submersion, making it ideal for wet, dusty, or high-contamination zones. The sensor operates reliably from -25°C to +100°C (ambient) and stores safely at -40°C to +85°C, adapting to extreme temperature variations. Mechanical specifications include a compact 40 x 40 x 118 mm form factor (225 g), screw terminal connections (supporting up to 2.5 mm² conductors with 1.8 Nm torque), and a flush-mountable design for space-efficient installation in vibration-prone machinery.
Designed for seamless integration into industrial systems worldwide, the NBB20-U1-A2-T complies with EN IEC 60947-5-2 safety standards and carries certifications like cULus listing and RoHS compliance, with CCC exemption for ≤36 V DC applications. Metal reduction factors (aluminum: 0.33, copper: 0.31, stainless steel 304: 0.74) allow adaptable detection across various metal types, enhancing versatility in automotive manufacturing, logistics, and process control. Functional safety parameters include an MTTFd of 1230 years and a 20-year mission time, ensuring long-term reliability in non-safety-integrated setups. Backed by 3D CAD models and EPLAN data, this sensor combines precision, ruggedness, and ease of use, making it a trusted choice for demanding automation tasks requiring consistent performance and environmental resilience.
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Attribute
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Details
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General Information
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Product Type
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Inductive Proximity Sensor
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Model
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NBB20-U1-A2-T
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Manufacturer
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Pepperl+Fuchs
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Sensing Characteristics
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Rated Operating Distance
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20 mm (flush mounting)
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Assured Operating Distance
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0–16.2 mm (guaranteed reliable detection range)
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Metal Reduction Factors
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Aluminum (0.33), Copper (0.31), Stainless Steel 304 (0.74)
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Switching Function
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Complementary (NO/NC configurable via 4-wire DC PNP output)
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Electrical Parameters
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Supply Voltage
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10–30 V DC
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Output Type
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4-wire DC PNP (sourcing, dual-state switching)
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Nominal Operating Current
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0–200 mA
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Off-State Current
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≤ 0.5 mA
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No-Load Supply Current
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≤ 20 mA
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Voltage Drop
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≤ 2 V
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Switching Frequency
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0–440 Hz (high-speed response for dynamic automation)
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Hysteresis
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Approximately 5% (minimizes signal fluctuations)
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Electrical Protection
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Reverse polarity protection; pulsing short-circuit protection; overload protection
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Indicators
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LEDs
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4 x 360° visible status indicators: Green (power), Yellow (switching state x2, signal direction)
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Mechanical Design
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Housing Material
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PA/metal composite with epoxy powder coating (corrosion/impact resistance)
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Sensing Face Material
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Polyamide (PA)
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Dimensions
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118 mm (L) × 40 mm (W) × 40 mm (H) (compact rectangular form for space-efficient mounting)
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Weight
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225 g
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Mounting Style
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Flush-mountable with bidirectional/rotatable sensor head (360° alignment flexibility)
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Connection Type
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M12 x 1 4-pin connector plug (secure, industrial-grade connection; supports 0.25–1.5 mm² conductors)
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Tightening Torque
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1.8 Nm (housing mounting stability)
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Environmental Ratings
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IP Rating
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IP68/IP69K (dust-tight, waterproof, and resistant to high-pressure jet cleaning)
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Operating Temperature Range
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-25°C to +100°C (ambient); -40°C to +85°C (storage)
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Certifications & Approvals
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Standards
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EN IEC 60947-5-2 (industrial switchgear safety), RoHS compliant
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Approvals
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cULus listed (USA/Canada), CCC exempt (≤36 V DC), CE marking (EU compliance)
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Functional Safety
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MTTFd (Mean Time To Failure)
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1,230 years (estimated reliability for non-safety-integrated systems)
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Mission Time (Tm)
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20 years (long-term operational lifespan)
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Diagnostic Coverage (DC)
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0% (standard for non-safety-critical applications)
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Applications
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Industrial automation, conveyor systems, robotic positioning, automotive manufacturing, food processing (washdown environments), and logistics (harsh, high-contamination zones)
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Pepperl+Fuchs NBB20-U1-A2-T Inductive Sensor | 20mm, 10-30V DC, IP69K, M30, PNP NO | High-Temp Industrial Images
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