Pepperl+Fuchs NJ5-18GK-SN-5M Inductive Proximity Sensor

USD 186.72

M18 flush inductive proximity sensor with 5mm sensing, NAMUR output, SIL 3 functional safety, IP68 protection, and ATEX/IECEx for hazardous areas.

SKU PEPPERL-FUCHS-NJ5-18GK-SN-5M Category
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Pepperl+Fuchs NJ5-18GK-SN-5M Inductive Proximity Sensor

Model Identifier NJ5-18GK-SN-5M
Official Part Number NJ5-18GK-SN-5M
GTIN Standard NA

Technical Overview

M18 flush inductive proximity sensor with 5mm sensing, NAMUR output, SIL 3 functional safety, IP68 protection, and ATEX/IECEx for hazardous areas.

Key Features

  • 5 mm flush installation for discrete and robust mounting
  • NAMUR output with safety function for intrinsically safe applications
  • ATEX/IECEx approvals for Zone 0/1/20/21 (Ex i) and Zone 2/22 (Ex ec/tc) for hazardous area use
  • Degree of protection IP68 ensures resistance against dust and water ingress
  • Cylindrical M18 threaded housing for standard industrial integration
  • 2-wire output type simplifies wiring and connectivity
  • Equipped with a 5-meter silicon connection cable for extended reach

Usable up to SIL 3 according to IEC 61508 for safety-related applications, ensuring high reliability and integrity in critical processes within hazardous environments.

Technical Specification Matrix

ParameterValue
Switching FunctionNormally closed (NC)
Output TypeNAMUR with safety function, 2-wire
Rated Operating Distance (sn)5 mm
Installationflush
Assured Operating Distance (sa)0 ... 4.05 mm
Nominal Voltage (Uo)8.2 V (Ri approx. 1 kΩ)
Switching Frequency (f)0 ... 500 Hz
Current Consumption (Measuring plate not detected)≥ 3 mA
Current Consumption (Measuring plate detected)≤ 1 mA
Safety Integrity Level (SIL)up to SIL 3 acc. to IEC 61508
Degree of ProtectionIP68
Ambient Temperature-40 ... 100 °C (-40 ... 212 °F)
Housing MaterialPP (Polypropylene)
Sensing Face MaterialPP (Polypropylene)
Connection TypeCable (silicon), 5 m
ATEX/IECEx ApprovalEx i (Zone 0/1/20/21), Ex ec/tc (Zone 2/22)
Construction TypeCylindrical, Threaded (M18)
Physical Weight (kg)0
Dimensions L x W x H (cm)4.4 x 1.8 x 1.8

Industrial Applications

1. Position Monitoring in Chemical Processing Plants

This sensor is ideally suited for precise detection of valve positions or the presence of metallic components within highly explosive atmospheres common in chemical manufacturing.

Problem Solved

Ensures safe and reliable position feedback in hazardous environments classified as Zone 0/1/20/21 by leveraging its ATEX/IECEx Ex-i approval and NAMUR output for intrinsic safety. Its IP68 rating allows operation in corrosive or dusty conditions, and SIL 3 capability meets stringent safety requirements for critical applications.

ATEX Ex-iIECExZone 0/1/20/21Intrinsic SafetyNAMURSIL 3IP685 mm flushProcess ControlValve Position

2. End-of-Travel Detection on Automated Machinery in Harsh Environments

The sensor can be used for reliable end-of-travel detection for moving parts in automated assembly lines, material handling systems, or packaging machinery where accurate metallic object detection is crucial.

Problem Solved

Provides accurate non-contact detection (5 mm flush) of metallic targets, reducing wear compared to mechanical switches. Its IP68 rating protects against dust, debris, and water ingress, making it suitable for washdown areas. The wide operating temperature range (-40 to 100 °C) ensures consistent performance in varying industrial conditions.

IP685 mm flush-40 to 100 °CNon-contact detectionAutomated machineryPosition sensingIndustrial automation

3. Safety Interlock for Access Panels on Explosive Atmosphere Equipment

Utilized as a safety interlock sensor to ensure that access panels or guards on machinery operating in hazardous areas (e.g., paint booths, grain silos) are securely closed before operation can commence.

Problem Solved

The SIL 3 rating and NAMUR output with safety function enable integration into high-integrity safety circuits, preventing dangerous machinery from operating with open guards. ATEX/IECEx approvals allow its use in potentially explosive atmospheres, meeting regulatory requirements for critical safety applications. The flush M18 mounting provides robust and discrete installation.

SIL 3NAMUR safety functionATEXIECExHazardous areaSafety interlockGuardingMachine safetyM18Flush mounting
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