Pepperl+Fuchs NCB8-18GM40-N0-V1 Inductive Sensor
This flush-mountable inductive proximity sensor features an 8 mm rated operating distance with NAMUR output and normally closed (NC) switching function. Certified for SIL 2 according to IEC 61508, it is designed for demanding industrial automation and safety applications.
Important: NAMUR sensors must be operated with approved switch amplifiers (e.g., Pepperl+Fuchs K-System isolated barriers). This sensor cannot be directly connected to standard PLC inputs.
Key Specifications
| Parameter |
Value |
| Model |
NCB8-18GM40-N0-V1 |
| Brand |
Pepperl+Fuchs |
| Product Type |
Inductive proximity sensor / NAMUR sensor |
| Switching function |
Normally closed (NC) |
| Output type |
NAMUR (2-wire) |
| Rated operating distance (sn) |
8 mm |
| Installation |
Flush (shielded) |
| Assured operating distance (sa) |
0 ... 6.48 mm |
| Actual operating distance (sr) |
7.2 ... 8.8 mm typ. 8 mm |
| Nominal voltage |
8.2 V (Ri approx. 1 kΩ) |
| Switching frequency |
0 ... 1500 Hz |
| Hysteresis |
1 ... 15 % typ. 5 % |
| Reverse polarity protection |
Yes |
| Short-circuit protection |
Yes |
| Current consumption (no target) |
≥ 2.2 mA |
| Current consumption (target present) |
≤ 1 mA |
| Switching state indicator |
Multihole-LED, yellow |
Functional Safety & Reliability
| Parameter |
Value |
| Safety Integrity Level (SIL) |
SIL 2 acc. to IEC 61508 |
| MTTFd |
2660 years |
| Mission Time (TM) |
20 years |
| Diagnostic Coverage (DC) |
0 % |
This sensor is certified for use in safety-related applications up to SIL 2 according to IEC 61508. For higher safety integrity (up to SIL 3), two sensors can be used in redundant configuration.
Mechanical & Environmental Specifications
| Parameter |
Value |
| Housing material |
Stainless steel 1.4305 / AISI 303 |
| Sensing face material |
PBT |
| Degree of protection |
IP66 / IP67 |
| Ambient temperature |
-25 ... 100 °C (-13 ... 212 °F) |
| Storage temperature |
-40 ... 100 °C (-40 ... 212 °F) |
| Connection type |
Connector plug, M12 x 1, 4-pin |
| Diameter |
18 mm |
| Length |
40 mm |
| Scope of delivery |
2 self-locking nuts |
Material Reduction Factors
| Material |
Reduction Factor |
| Aluminum (rAl) |
0.39 |
| Copper (rCu) |
0.36 |
| Stainless steel (r304) |
0.71 |
Output Characteristics
| Condition |
Output Signal |
| Target not detected (no metal) |
Current consumption ≥ 2.2 mA |
| Target detected (metal present) |
Current consumption ≤ 1 mA |
The output follows NAMUR EN 60947-5-6:2000 and IEC 60947-5-6:1999 standards.
Hazardous Area Approvals
| Certification |
Equipment Protection Level |
Certificate No. |
| ATEX |
Ga, Gb, Da |
PTB 00 ATEX 2048 X |
| IECEx |
Ga, Gb, Da, Mb |
IECEx PTB 11.0037X |
| UL |
Hazardous Location |
E501628 |
| UL |
Ordinary Location |
E87056 |
| CCC |
Hazardous Location |
2020322315002255 |
| NEPSI |
- |
GYJ16.1393X |
| ANZEx |
- |
18.3018X |
| Marine |
DNVGL |
TAA00001A5 |
Suitable for:
- Gas hazardous areas: Zone 0, 1, 2 (Equipment protection level Ga, Gb)
- Dust hazardous areas: Zone 20, 21, 22 (Equipment protection level Da)
- Mining: Equipment protection level Mb
Key Features
High-Performance Sensing
8 mm flush sensing with shielded design for space-constrained applications, 1500 Hz switching frequency for fast-moving targets, and normally closed (NC) failsafe operation.
NAMUR Output (2-Wire)
NAMUR output according to EN 60947-5-6 / IEC 60947-5-6 with 2-wire connection for intrinsic safety applications. Must be operated with approved NAMUR switch amplifiers.
SIL 2 Functional Safety
SIL 2 certified according to IEC 61508 with MTTFd of 2,660 years and 20-year mission time for long-term safety system deployment.
Rugged Construction
Stainless steel housing (AISI 303) with PBT sensing face, IP66/IP67 protection rating, and wide temperature range (-25°C to +100°C) for extreme conditions.
M12 Connector
4-pin M12 connector for quick installation and replacement, compatible with standard M12 cordsets.
Protection Features
Reverse polarity protection, short-circuit protection, and suitability for 2:1 technology without requiring reverse polarity protection diode.
Applications
| Industry |
Application Examples |
| Oil & Gas |
Position monitoring, valve feedback in hazardous areas, offshore platforms |
| Chemical / Pharmaceutical |
Tank level monitoring, equipment position detection in explosive atmospheres |
| Process Automation |
Safety interlock systems, limit monitoring with SIL 2 requirements |
| Marine / Offshore |
DNVGL certified for maritime applications with corrosion-resistant sensing |
| Machine Building |
End-stop detection, positioning control with M12 connector for quick replacement |
| Safety Instrumented Systems (SIS) |
SIL2-rated limit switches for emergency shutdown systems |
Typical Use Cases
- Position monitoring of valves, gates, and actuators in hazardous areas (Zone 0/1/2 gas, Zone 20/21/22 dust)
- End-stop detection for linear actuators and conveyors in harsh environments
- Speed monitoring of rotating equipment (up to 1500 Hz switching frequency)
- Safety interlock monitoring for machinery access doors with SIL 2 compliance
- Marine applications with DNVGL certification for shipboard equipment
Compatible Switch Amplifiers & Accessories (Required)
NAMUR sensors must be operated with approved switch amplifiers. Recommended Pepperl+Fuchs accessories include:
| Accessory |
Model |
Description |
| Terminal amplifier |
KCD2-E2L |
Single-channel terminal amplifier with line breakage detection, input for NAMUR sensors, DC 24 V supply voltage |
| Terminal amplifier |
|
1-channel isolated barrier, 24 V DC supply, relay output, line fault detection, SIL 2, 12.5 mm width |
| Cable connector |
V1-G-N-2M-PUR |
Female cordset, M12 straight, 2-pin, PUR cable blue, NAMUR, 2 m |
| Cable connector |
V1-W-N-2M-PUR |
Female cordset, M12 angled, 2-pin, PUR cable blue, NAMUR, 2 m |
| Mounting flange |
BF 18 |
Mounting flange for 18 mm sensors |
| Mounting bracket |
CPZ18B03 |
Mounting bracket with swivel nut |
Contact us for amplifier recommendations based on your application requirements.
Standards & Compliance
| Standard |
Description |
| EN 60947-5-6:2000 |
NAMUR sensor standard |
| IEC 60947-5-6:1999 |
NAMUR sensor standard |
| EN IEC 60947-5-2 |
Proximity switch standard |
| NE 21:2007 |
Electromagnetic compatibility |
| IEC 61508 |
Functional safety – SIL 2 certified |
Ordering Information
| Item |
Details |
| Manufacturer |
Pepperl+Fuchs SE |
| Part Number |
NCB8-18GM40-N0-V1 |
| Alternative Part Number |
103595 |
| Product Status |
Active / In Stock |
| Country of Origin |
Indonesia |
| Packaging |
Factory sealed box |
| HS Code |
8543.70.9860 |
| ECLASS 13.0 |
27274001 |
| ETIM 9.0 |
EC002714 |
| UNSPSC 12.1 |
39121550 |
Pricing Reference
| Quantity |
Unit Price (USD) |
| 1 |
$122.65 |
| 10 |
$111.16 |
| 25 |
$107.32 |
Prices are for reference only; contact us for current volume pricing.
Key Benefits
Intrinsic Safety
NAMUR output with ATEX/IECEx approval for hazardous area use (Zone 0/1/2 gas, Zone 20/21/22 dust)
Functional Safety
SIL 2 certified for safety-critical applications up to SIL 2
Exceptional Durability
Stainless steel housing + IP66/IP67 rating for harsh environments
Wide Temperature Range
-25°C to +100°C for extreme operating conditions
High-Speed Detection
1500 Hz switching frequency for fast-moving targets
Long Service Life
MTTFd of 2,660 years with 20-year mission time
Global Approvals
ATEX, IECEx, UL, CCC, NEPSI, ANZEx, KCC – one sensor for worldwide use
Marine Approved
DNVGL certified for maritime applications
Quick Installation
M12 connector for fast replacement – no cable stripping required
Proven Reliability
Pepperl+Fuchs – trusted leader in industrial sensors
Flush Installation
8 mm sensing distance with flush mounting capability
Normally Closed Operation
Failsafe output configuration
Technical Support
Contact us for:
- Technical specifications and complete datasheets
- Volume pricing and availability
- Compatible switch amplifier recommendations (KCD2-E2L, etc.)
- M12 cordsets (V1-G-N-2M-PUR, V1-W-N-2M-PUR)
- Installation and wiring guidance
- Functional safety documentation
- Hazardous area application engineering support
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