Pepperl+Fuchs cylindrical Inductive Proximity Sensor (NBB4-12GM50-E2)

The Pepperl+Fuchs NBB4-12GM50-E2 is an industry-standard, high-reliability cylindrical inductive proximity sensor engineered for non-contact detection of metallic targets within automated machinery and industrial process control lines. Featuring a precision M12 threaded brass housing with durable nickel plating, this sensor provides a flush-mountable 4 mm sensing range ( $s_n$ ). Operating on a standard 3-wire DC configuration with a PNP Normally Open (NO) switching output, it delivers fast, wear-free object tracking under challenging factory-floor conditions.

Key Features

Non-Contact Flush Detection: Engineered for smooth flush installation directly into metallic mounting plates, providing a precise $4\text{ mm}$ target window while remaining shielded from side-proximity interference.
Standard M12 Cylindrical Profile: Threaded across a $50\text{ mm}$ housing body length, allowing flexible depth adjustments using the included dual-locking hex nuts.
Advanced Electronic Protection: Outfitted with integrated reverse polarity protection, short-circuit containment pulsing, and overload suppression to safeguard internal PNP logic from system wiring anomalies.
Rugged Built Quality: Encased in a nickel-plated brass tube combined with a heavy-duty PBT plastic sensing face, ensuring high resistance against machine oils, vibration, and typical plant cleaning washes.
High Switching Frequency: Offers rapid response times optimized for high-speed indexing wheels, material counting lines, and synchronized mechanical feedback loops.

Technical Specifications

Feature	Specification
Model Number	NBB4-12GM50-E2
Brand / Manufacturer	Pepperl+Fuchs
Product Type	Cylindrical Inductive Proximity Sensor
Housing Geometry	Cylindrical Threaded M12 ( $12\text{ mm}$ Diameter $\times 50\text{ mm}$ Length)
Installation Style	Flush / Shielded mount
Rated Operating Distance ( $s_n$ )	$4\text{ mm}$
Output Type	3-Wire DC, PNP, Normally Open (NO)
Operating Voltage ( $U_B$ )	10 V DC to 30 V DC Nominal
Switching Frequency ( $f$ )	$0\text{ Hz}$ to $800\text{ Hz}$ range
Connection Configuration	Available in standard integrated PVC cable or standard M12 plug connector (E2-V1 variants)
IP Protection Rating	IP67 dust/waterproof ingress rating
Certifications	cULus Listed, CE Marked, CCC Approved

Applications

Machine Tool Position Sensing: Tracking the precise travel limits of pneumatic cylinders, motorized axes, and rotary tooling tables.
Conveyor Sorting Arrays: Detecting the presence or absence of metallic parts, trays, and pallets along high-speed automated transport belts.
Assembly Line Verification: Serving as a primary digital interface input to verify part placement inside automotive component presses or robotic assembly cells.
Packaging Machinery: Providing high-frequency counting data from target pins on cam tracks, indexing wheels, and capping carousels.