Serviceline Industrial Sensors
Serviceline Explosion Protection

Inductive sensor NCN3-F31K-N4

NCN3-F31K-N4
  • Direct mounting on standard actuators
  • Fixed setting
  • EC-Type Examination Certificate TÜV99 ATEX 1479X
  • Usable up to SIL 2 acc. to IEC 61508


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

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
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
MTTFd1470 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
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
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)Cage tension spring terminals
Core cross-section (system side)Flexible: 0.2 ... 1.5 mm2
rigid: 0.2 ... 2.5 mm2
Housing materialPBT
Sensing facePBT
Degree of protectionIP67
Tightening torque, housing screws1 Nm
Tightening torque, cable glandM20 x 1.5 ; max. 7 Nm
Data for application in connection with hazardous areas
Equipment protection levelGa , Gb , Gc (ic) Da , Mb
Equipment protection level Ga
Type of protectionintrinsic safety
CE marking[*PD-Z02585A*]
Certificates
Appropriate typeNCN3-F31K-N4...
ATEX certificateTÜV 99 ATEX 1479 X
ATEX markingEx-Hexagon II 1G Ex ia IIC T6...T1 Ga
StandardsEN 60079-0:2012+A11:2013 , EN 60079-11:2012
IECEx certificateIECEx TUN 17.0021X
IECEx markingEx ia IIC T6...T1 Ga
StandardsIEC 60079-0:2011 , IEC 60079-11:2011
Effective internal capacitancemax. 100 nF
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Effective internal inductancemax. 100 µH
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Maximum permissible ambient temperatureAlso observe the maximum permissible ambient temperature stated in the general technical data.
Keep to the lower of the two values.
for ATEXat Ui = 15 V , Ii = 25 mA , Pi = 34 mW ,
T6 : 55 °C (131 °F)
T5 : 65 °C (149 °F)
T4 : 95 °C (203 °F)
T3 : 95 °C (203 °F)
T2 : 95 °C (203 °F)
T1 : 95 °C (203 °F)
at Ui = 15 V , Ii = 25 mA , Pi = 64 mW ,
T6 : 55 °C (131 °F)
T5 : 65 °C (149 °F)
T4 : 95 °C (203 °F)
T3 : 95 °C (203 °F)
T2 : 95 °C (203 °F)
T1 : 95 °C (203 °F)
at Ui = 15 V , Ii = 52 mA , Pi = 169 mW ,
T6 : 45 °C (113 °F)
T5 : 60 °C (140 °F)
T4 : 85 °C (185 °F)
T3 : 85 °C (185 °F)
T2 : 85 °C (185 °F)
T1 : 85 °C (185 °F)
for IECExat Ui = 15 V , Ii = 25 mA , Pi = 34 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 15 V , Ii = 25 mA , Pi = 64 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 15 V , Ii = 52 mA , Pi = 169 mW ,
T6 : 65 °C (149 °F)
T5 : 80 °C (176 °F)
T4 : 90 °C (194 °F)
T3 : 90 °C (194 °F)
T2 : 90 °C (194 °F)
T1 : 90 °C (194 °F)
Equipment protection level Gb
Type of protectionintrinsic safety
CE marking[*PD-Z02585A*]
Certificates
Appropriate typeNCN3-F31K-N4...
ATEX certificateTÜV 99 ATEX 1479 X
ATEX markingEx-Hexagon II 1G Ex ia IIC T6…T1 Ga
StandardsEN 60079-0:2012+A11:2013 , EN 60079-11:2012
IECEx certificateIECEx TUN 17.0021X
IECEx markingEx ia IIC T6...T1 Ga
StandardsIEC 60079-0:2011 , IEC 60079-11:2011
Effective internal capacitancemax. 100 nF
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Effective internal inductancemax. 100 µH
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Maximum permissible ambient temperatureAlso observe the maximum permissible ambient temperature stated in the general technical data.
Keep to the lower of the two values.
at Ui = 15 V , Ii = 25 mA , Pi = 34 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 15 V , Ii = 25 mA , Pi = 64 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 15 V , Ii = 52 mA , Pi = 169 mW ,
T6 : 65 °C (149 °F)
T5 : 80 °C (176 °F)
T4 : 90 °C (194 °F)
T3 : 90 °C (194 °F)
T2 : 90 °C (194 °F)
T1 : 90 °C (194 °F)
Equipment protection level Gc (ic)
Type of protectionintrinsic safety
CE marking[*PD-Z02586A*]
Certificates
ATEX certificatePF13CERT2895 X
ATEX markingEx-Hexagon II 3G Ex ic IIC T6…T1 Gc
StandardsEN 60079-0:2012+A11:2013 , EN 60079-11:2012
Effective internal capacitancemax. 100 nF
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Effective internal inductancemax. 100 µH
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Maximum permissible ambient temperatureAlso observe the maximum permissible ambient temperature stated in the general technical data.
Keep to the lower of the two values.
at Ui = 20 V , Ii = 25 mA , Pi = 34 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 20 V , Ii = 25 mA , Pi = 64 mW ,
T6 : 70 °C (158 °F)
T5 : 85 °C (185 °F)
T4 : 100 °C (212 °F)
T3 : 100 °C (212 °F)
T2 : 100 °C (212 °F)
T1 : 100 °C (212 °F)
at Ui = 20 V , Ii = 52 mA , Pi = 169 mW ,
T6 : 65 °C (149 °F)
T5 : 80 °C (176 °F)
T4 : 90 °C (194 °F)
T3 : 90 °C (194 °F)
T2 : 90 °C (194 °F)
T1 : 90 °C (194 °F)
Equipment protection level Da
Type of protectionintrinsic safety
CE marking[*PD-Z02585A*]
Certificates
Appropriate typeNCN3-F31K-N4...
ATEX certificateTÜV 99 ATEX 1479 X
ATEX markingEx-Hexagon II 1D Ex ia IIIC T135°C Da
StandardsEN 60079-0:2012+A11:2013 , EN 60079-11:2012
IECEx certificateIECEx TUN 17.0021X
IECEx markingEx ia IIIC T135°C Da
StandardsIEC 60079-0:2011 , IEC 60079-11:2011
Effective internal capacitancemax. 100 nF
A cable length of 10 m is considered.
Effective internal inductancemax. 100 µH
A cable length of 10 m is considered.
Maximum permissible ambient temperatureAlso observe the maximum permissible ambient temperature stated in the general technical data.
Keep to the lower of the two values.
at Ui = 15 V , Ii = 25 mA , Pi = 34 mW : 100 °C (212 °F)
at Ui = 15 V , Ii = 25 mA , Pi = 64 mW : 100 °C (212 °F)
at Ui = 15 V , Ii = 52 mA , Pi = 169 mW : 90 °C (194 °F)
Equipment protection level Mb
Type of protectionintrinsic safety
CE marking[*PD-Z02585A*]
Certificates
Appropriate typeNCN3-F31K-N4...
IECEx certificateIECEx TUN 17.0021X
IECEx markingEx ia I Mb
StandardsIEC 60079-0:2011 , IEC 60079-11:2011
Effective internal capacitancemax. 100 nF
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Effective internal inductancemax. 100 µH
The value is applicable for one sensor circuit.
A cable length of 10 m is considered.
Maximum permissible ambient temperatureAlso observe the maximum permissible ambient temperature stated in the general technical data.
Keep to the lower of the two values.
at Ui = 15 V , Ii = 25 mA , Pi = 34 mW : 100 °C (212 °F)
at Ui = 15 V , Ii = 25 mA , Pi = 64 mW : 100 °C (212 °F)
at Ui = 15 V , Ii = 52 mA , Pi = 169 mW : 90 °C (194 °F)
General information
Use in the hazardous areasee instruction manuals

Documents: NCN3-F31K-N4

Instruction manualsLanguageFile TypeFile Size
ИнструкцииBULPDF148 KB
Návod k poużitíCZEPDF141 KB
Instruktions manualDANPDF139 KB
Instruction manualENGPDF144 KB
KasutusjuhendESTPDF2 KB
KäyttöohjeFINPDF0 KB
Manuel d'instructionsFRAPDF0 KB
BetriebsanleitungGERPDF144 KB
Οδηγίες χρήσηςGREPDF152 KB
HandleidingHOLPDF0 KB
Instruction manual / BetriebsanleitungHRVPDF0 KB
Használati útmutatóHUNPDF0 KB
Manuale di istruzioniITAPDF0 KB
Lietošanas pamācībaLAVPDF0 KB
Instrukciju vadovasLITPDF0 KB
Instrukcja obsługiPOLPDF0 KB
Manual de instruçõesPORPDF0 KB
Manual de utilizareRONPDF0 KB
Návod na poużitieSLKPDF141 KB
Navodila za uporaboSLVPDF138 KB
Manual de instruccionesSPAPDF142 KB
ManualSWEPDF137 KB

Approvals+Certificates: NCN3-F31K-N4

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-1176BPDF248 KB
Certificates
CN NEPSI Ex iaGYJ14.1442XPDF2915 KB
CN NEPSI Ex nLGYJ14.1443XPDF2352 KB
Canada USA CSA Ordinary Location1007121PDF99 KB
Canada USA UL Ordinary Location20190220-E87056PDF403 KB
EU TUV Nord ATEX ia 2G, 1G, 1D s. certificateTÜV 99 ATEX 1479 XPDF4682 KB
Europe Pepperl+Fuchs Certificate ATEX Category 3PF13CERT2895XPDF1101 KB
Russia NANIO "CCVE"TC RU C-DE.AA87.B.00394PDF3971 KB
Worldwide Pepperl+Fuchs Functional Safety CertificatePF12CERT2382BPDF1649 KB
Worldwide TUV Nord IECEx iaIECEx TUN 17.0021XLINK---

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