Serviceline Industrial Sensors
Serviceline Explosion Protection

Inductive sensor NCN3-F31K-N4-K-S

NCN3-F31K-N4-K-S
  • Direct mounting on standard actuators
  • Fixed setting
  • EC-Type Examination Certificate TÜV99 ATEX 1479X
  • Screw terminals
  • Usable up to SIL 2 acc. to IEC 61508
  • LEDs for switching state of sensor and solenoid valve
  • Valve LEDs disconnectable


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  NCN3-F31K-N4-K-S

General specifications
Switching function2 x normally closed (NC)
Output typeNAMUR
Rated operating distance3 mm
Installationflush mountable
Assured operating distance0 ... 2.4 mm
Actual operating distance2.7 ... 3.3 mm typ.
Actuating elementStainless steel 1.4305 / AISI 303
8.5 mm x 8.5 mm x 0.5 mm
Reduction factor rAl 0.5
Reduction factor rCu 0.4
Reduction factor r304 1
Reduction factor rSt37 1.3
Reduction factor rBrass 0.6
Output type2-wire
Nominal ratings
Nominal voltage8 V
Switching frequency0 ... 3 kHz
Hysteresistyp. 5 %
Reverse polarity protectionreverse polarity protected
Short-circuit protectionyes
Suitable for 2:1 technologyyes , Reverse polarity protection diode not required
Current consumption
Measuring plate not detected≥ 3 mA
Measuring plate detected≤ 1 mA
Time delay before availability≤ 1.1 ms
Switching state indicatorLED, yellow
Valve status indicatorLED, yellow
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
MTTFd1470 a
Mission Time (TM)20 a
Diagnostic Coverage (DC)0 %
Valve circuit
Voltagemax. 32 V DC
Currentmax. 240 mA
Short-circuit protectionno
Reverse polarity protectionyes, with reversed output LED is out of function, therfore more power for solenoid valve
Compliance with standards and directives
Standard conformity
NAMUREN 60947-5-6:2000
IEC 60947-5-6:1999
Electromagnetic compatibilityNE 21:2007
StandardsEN 60947-5-2:2007
EN 60947-5-2/A1:2012
IEC 60947-5-2:2007
IEC 60947-5-2 AMD 1:2012
Approvals and certificates
EAC conformityTR CU 012/2011
UL approvalcULus Listed, General Purpose
Ordinary LocationE87056
Hazardous LocationE501628
Control drawing116-0456
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)
Storage temperature-40 ... 100 °C (-40 ... 212 °F)
Mechanical specifications
Connection (system side)Screw terminals, tightening torque min. 0.5 Nm
Stripped length 7 mm
Core cross-section (system side)rigid: 0.14 ... 2.5 mm2
flexible: 0.14 ... 1.5 mm2
flexible with core-end sleeve: 0.25 ... 1.5 mm2
Connection (valve side)like connection (system side)
Core cross-section (valve side)like core cross section (system side)
Housing materialPBT
Sensing facePBT
Degree of protectionIP67
Tightening torque, housing screws1 Nm
Tightening torque, cable glandM20 x 1.5 ; max. 7 Nm
M12 x 1.5 ; max. 1.5 Nm
NoteLED switch-off
General information
Use in the hazardous areasee instruction manuals

Documents: NCN3-F31K-N4-K-S

Instruction manualsLanguageFile TypeFile Size
ИнструкцииBULPDF180 KB
Návod k poużitíCZEPDF171 KB
Instruktions manualDANPDF169 KB
Instruction manualENGPDF171 KB
KasutusjuhendESTPDF163 KB
KäyttöohjeFINPDF163 KB
Manuel d'instructionsFRAPDF174 KB
BetriebsanleitungGERPDF171 KB
Οδηγίες χρήσηςGREPDF182 KB
HandleidingHOLPDF172 KB
Instruction manual / BetriebsanleitungHRVPDF168 KB
Használati útmutatóHUNPDF174 KB
Manuale di istruzioniITAPDF173 KB
Lietošanas pamācībaLAVPDF169 KB
Instrukciju vadovasLITPDF171 KB
Instrukcja obsługiPOLPDF173 KB
Manual de instruçõesPORPDF173 KB
Manual de utilizareRONPDF175 KB
Návod na poużitieSLKPDF172 KB
Navodila za uporaboSLVPDF168 KB
Manual de instruccionesSPAPDF234 KB
ManualSWEPDF168 KB

Approvals+Certificates: NCN3-F31K-N4-K-S

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-1178APDF248 KB
Certificates
Canada USA CSA Ordinary Location1007121PDF99 KB
Canada USA UL Hazardous LocationE501628:1:6PDF573 KB
Canada USA UL Ordinary Location20190220-E87056PDF403 KB
EU TUV Nord ATEX ia 2G, 1G, 1D s. certificateTÜV 99 ATEX 1479 XPDF5439 KB
Europe Pepperl+Fuchs Certificate ATEX Category 3PF13CERT2895XPDF495 KB
Russia NANIO "CCVE"TC RU C-DE.AA87.B.00394PDF3971 KB
Worldwide Pepperl+Fuchs Functional Safety CertificatePF12CERT2382EPDF1649 KB
Worldwide TUV Nord IECEx iaIECEx TUN 17.0021XLINK---
Control drawings
Control drawing UL / Control drawing UL   PDF378 KB

Associated Products: NCN3-F31K-N4-K-S

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