Serviceline Industrial Sensors
Serviceline Explosion Protection

Inductive sensor NJ20-40-N

NJ20-40-N
  • 20 mm non-flush


NAMUR sensors must be operated with approved switch amplifiers. Please find suitable devices below:

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH, also apply to Pepperl+Fuchs AG.

Download the complete datasheet as a PDF:


Datasheet excerpt: Technical data of  NJ20-40-N

General specifications
Switching functionNormally closed (NC)
Output typeNAMUR
Rated operating distance20 mm
Installationnon-flush
Assured operating distance0 ... 16.2 mm
Reduction factor rAl 0.4
Reduction factor rCu 0.3
Reduction factor r304 0.85
Output type2-wire
Nominal ratings
Nominal voltage8.2 V (Ri approx. 1 kΩ)
Switching frequency0 ... 100 Hz
Current consumption
Measuring plate not detectedmin. 3 mA
Measuring plate detected≤ 1 mA
Functional safety related parameters
MTTFd11400 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Compliance with standards and directives
Standard conformity
NAMUREN 60947-5-6:2000
IEC 60947-5-6:1999
StandardsEN 60947-5-2:2007
IEC 60947-5-2:2007
Approvals and certificates
FM approval
Control drawing116-0165
UL approvalcULus Listed, General Purpose
CSA approvalcCSAus Listed, General Purpose
CCC approvalCCC approval / marking not required for products rated ≤36 V
Ambient conditions
Ambient temperature-25 ... 100 °C (-13 ... 212 °F)
Mechanical specifications
Connection typeterminal compartment
Core cross-sectionup to 2.5 mm2
Housing materialPBT
Sensing facePBT
Degree of protectionIP67
Equipment protection level Gb
CE marking[*PD-Z02585A*]
ATEX markingEx-Hexagon II 2G Ex ia IIC T6…T1 Gb
The Ex-related marking can also be printed on the enclosed label.
StandardsEN 60079-0:2012+A11:2013, EN 60079-11:2012
Ignition protection "Intrinsic safety"
Use is restricted to the following stated conditions
Appropriate typeNJ 20-40-N...
Effective internal capacitancemax. 140 nF ; a cable length of 10 m is considered.
Effective internal inductancemax. 140 µH ; a cable length of 10 m is considered.
Maximum permissible ambient temperatureDetails of the correlation between the type of circuit connected, the maximum permissible ambient temperature, the temperature class, and the effective internal reactance values can be found on the EU-type examination certificate.
Equipment protection level Da
CE marking[*PD-Z02585A*]
ATEX markingEx-Hexagon II 1D Ex ia IIIC T135°C Da
The Ex-related marking can also be printed on the enclosed label.
StandardsEN 60079-0:2012+A11:2013, EN 60079-11:2012
Ignition protection "Intrinsic safety"
Use is restricted to the following stated conditions
Appropriate typeNJ 20-40-N...
Effective internal capacitancemax. 140 µF
A cable length of 10 m is considered.
Effective internal inductancemax. 140 µH
A cable length of 10 m is considered.
General information
Use in the hazardous areasee instruction manuals
Category2G

Documents: NJ20-40-N

Instruction manualsLanguageFile TypeFile Size
Instruction manualENGPDF56 KB
Manuel d'instructionsFRAPDF57 KB
BetriebsanleitungGERPDF58 KB
Manuale di istruzioniITAPDF53 KB
Manual de instruccionesSPAPDF55 KB

Approvals+Certificates: NJ20-40-N

CertificatesCertificate No.File TypeFile Size
Canada USA CSA Ordinary Location1007121PDF99 KB
Canada USA UL Ordinary Location20170306-E87056PDF407 KB
EU PTB ATEX ia 2G, 1G, 1D s. certificatePTB 00 ATEX 2048 XPDF29071 KB
Worldwide PTB IECEx iaIECEx PTB 11.0037XLINK---
Control drawings
Control Drawing FM / Control Drawing FM   PDF686 KB

Associated Products: NJ20-40-N

Accessories
Mounting flange, 40 mmfa