Pepperl+Fuchs NJ Series Inductive Sensors NJ1,5-8GM-N

Technical Dossier

Product Details And Specifications

Pepperl+Fuchs NJ Series Inductive Sensors Technical Notes

The Evolution of NJ Series Architecture

The NJ Series was introduced by Pepperl+Fuchs in the early 1980s as a standardized inductive sensor line designed to replace relay-based limit switches in machine tool and conveyor applications. The original NJ family used analog-output proximity circuits with discrete wiring; subsequent generations introduced IO-Link compatibility on select variants, enabling parameterization and diagnostic feedback over a single 3-wire cable without additional hardware.

Key architectural milestones include the transition from PVC-jacketed cable terminations to M12 quick-disconnect connectors (mid-1990s), the introduction of stainless-steel V2A and V4A housing options for food-grade and corrosive environments, and the addition of NAMUR-output variants (NJ…-N suffix) for use in intrinsically safe circuits in Zone 1/Zone 2 hazardous areas. The NAMUR output standard (EN 60947-5-6) is specifically relevant to the NJ1,5-8GM-N, which is designed for direct connection to NAMUR-compatible safety barriers and isolators in Ex-rated installations.

As the NJ Series has matured, many early-generation part numbers have entered end-of-life status. Pepperl+Fuchs has issued replacement recommendations for several discontinued variants, but installed base requirements in legacy DCS and SIS architectures frequently demand exact form-fit-function replacements rather than functional equivalents.

NJ Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked part numbers within the Pepperl+Fuchs NJ Series. Each entry includes the primary functional descriptor. SKUs are organized by housing diameter and output type.

M8 Housing (8 mm diameter):

• NJ1,5-8GM-N: M8 flush inductive sensor, 1.5 mm range, NAMUR output, for Ex Zone 1/2 applications
• NJ1,5-8GM-N-5M: M8 flush, 1.5 mm range, NAMUR output, 5 m PVC cable termination
• NJ1,5-8GK-N: M8 flush, 1.5 mm range, NAMUR output, short-body variant
• NJ1,5-8GM-E2: M8 flush, 1.5 mm range, DC 3-wire PNP NO output, standard industrial
• NJ1,5-8GM-E2-V3: M8 flush, 1.5 mm range, DC 3-wire PNP NO, V3 connector version

M12 Housing (12 mm diameter):

• NJ2-12GM-N: M12 flush, 2 mm range, NAMUR output, Ex-rated proximity sensor
• NJ4-12GM-N: M12 non-flush, 4 mm range, NAMUR output, extended sensing distance
• NJ4-12GM-E2: M12 non-flush, 4 mm range, DC 3-wire PNP NO, general purpose
• NJ4-12GK-N: M12 non-flush, 4 mm range, NAMUR output, short-body design
• NJ2-12GM40-E2-V1: M12 flush, 2 mm range, PNP NO, 40 mm extended body, M12 connector

M18 Housing (18 mm diameter):

• NJ5-18GM-N: M18 flush, 5 mm range, NAMUR output, standard hazardous area sensor
• NJ8-18GM-N: M18 non-flush, 8 mm range, NAMUR output, extended range Ex sensor
• NJ8-18GM-E2: M18 non-flush, 8 mm range, DC 3-wire PNP NO, general industrial
• NJ5-18GK-N: M18 flush, 5 mm range, NAMUR output, short-body variant

M30 Housing (30 mm diameter):

• NJ15-30GM-N: M30 non-flush, 15 mm range, NAMUR output, heavy-duty Ex proximity sensor
• NJ15-30GM-E2: M30 non-flush, 15 mm range, DC 3-wire PNP NO, standard industrial
• NJ10-30GM-N: M30 flush, 10 mm range, NAMUR output, flush-mount Ex sensor

Quality Control for the NJ Series Range

All NJ Series sensors processed through DriveKNMS undergo a structured inspection and functional test protocol prior to shipment:

• Visual inspection: Housing thread condition, cable jacket integrity, connector pin condition, and label legibility are checked against OEM specifications.
• Electrical continuity: Supply voltage, output switching state, and leakage current are measured at rated operating voltage (for NAMUR variants: 8 VDC per EN 60947-5-6).
• Switching distance verification: Sensing range is confirmed using a standard Fe360 target at rated operating distance and hysteresis boundaries.
• NAMUR threshold test: For -N suffix variants, open-circuit and short-circuit current levels are verified to confirm compatibility with downstream safety barriers (e.g., Pepperl+Fuchs Z728, MTL7706).
• Temperature cycling: Spot-checked units are subjected to thermal cycling per IEC 60068-2-14 to verify seal integrity and output stability.