Pepperl+Fuchs NBN40-U4LK-N0 Inductive Proximity Sensor

USD 113.28

NAMUR inductive proximity sensor with 40mm non-flush sensing, ATEX/IECEx approval, IP67/IP69K, and -25 to 100°C operating temperature.

SKU PEPPERL-FUCHS-NBN40-U4LK-N0 Category
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Pepperl+Fuchs NBN40-U4LK-N0 Inductive Proximity Sensor.

Model Identifier NBN40-U4LK-N0
Official Part Number NBN40-U4LK-N0
GTIN Standard NA

Technical Overview

The Pepperl+Fuchs NBN40-U4LK-N0 is an inductive proximity sensor featuring a 40 mm non-flush rated operating distance and a NAMUR output. It is designed with a bidirectional and rotatable sensor head for flexible installation. With ATEX and IECEx approvals, it is suitable for use in hazardous areas. The sensor provides normally closed switching function, reverse polarity protection, and short-circuit protection, making it robust for industrial applications. It boasts an IP67/IP69K degree of protection.

Key Features

  • 40 mm non-flush rated operating distance.
  • Sensor head bidirectional and rotatable.
  • NAMUR output, normally closed (NC) switching function.
  • ATEX and IECEx approval for hazardous areas.
  • Polarity reversal protected and short-circuit protected.
  • Wide ambient temperature range of -25 °C to 100 °C.
  • High degree of protection: IP67 / IP69K.
  • Equipped with a yellow LED switching state indicator.
  • Features screw terminals for connection.

ATEX and IECEx approved NAMUR output for intrinsic safety in hazardous environments.

Technical Specification Matrix

ParameterValue
Rated operating distance (sn)40 mm
InstallationNon-flush
Output typeNAMUR, 2-wire
Switching functionNormally closed (NC)
Nominal voltage (Uo)8.2 V (Ri approx. 1 kΩ)
Switching frequency (f)0 ... 100 Hz
Hysteresis (H)2 ... 20 % typ. 10 %
Reverse polarity protectionYes
Short-circuit protectionYes
Current consumption (measuring plate not detected)min. 2.5 mA
Current consumption (measuring plate detected)≤ 1 mA
Switching state indicatorLED, yellow
Ambient temperature-25 ... 100 °C (-13 ... 212 °F)
Storage temperature-40 ... 100 °C (-40 ... 212 °F)
Connection typeScrew terminals
Housing materialPA
Sensing face materialPA
Degree of protectionIP67 / IP69K
ATEX approvalEquipment protection level Ga, Gb, Da (PTB 00 ATEX 2032 X)
IECEx approvalEquipment protection level Ga, Gb, Da (IECEx PTB 11.0021X)

Industrial Applications

1. Hazardous Area Material Flow Detection

This sensor can be used to detect the presence or position of metallic objects, such as product carriers or conveyor belt components, in chemical processing plants or other environments where flammable gases or dusts may be present. Its 40mm non-flush sensing distance allows for reliable detection without direct contact.

Problem Solved

Ensures safe and reliable material handling in potentially explosive atmospheres by providing an intrinsically safe signal (NAMUR output) to a control system, preventing hazards associated with electrical sparking. The ATEX/IECEx approval is critical here.

Intrinsically SafeATEXIECExNAMURMaterial HandlingPosition DetectionChemical ProcessingConveyor Systems

2. Robust Valve Position Feedback in Harsh Conditions

The NBN40-U4LK-N0 can serve as an end-of-travel sensor for large industrial valves (e.g., in food processing or pharmaceutical manufacturing) that require frequent high-pressure washdowns. Its IP67/IP69K rating ensures resistance to water ingress and high-pressure jets, while the wide operating temperature range handles process variations.

Problem Solved

Provides reliable feedback on valve open/closed positions even after aggressive cleaning procedures, preventing operational errors and maintaining hygiene standards without sensor failure due to water or cleaning agents.

IP67IP69KWashdownValve PositionFood ProcessingPharmaceuticalEnd-of-TravelHigh-Pressure Cleaning

3. Object Presence Sensing in Elevated Temperature Zones

Due to its broad operating temperature range of up to 100 °C, this inductive sensor is well-suited for detecting metallic objects within industrial ovens, drying tunnels, or other high-temperature manufacturing processes where standard sensors would fail. Its non-flush installation and robust housing (PA) contribute to its durability.

Problem Solved

Accurately confirms the presence or absence of workpieces or trays in elevated temperature zones, enabling automated process control and preventing damage or inefficient operation due to misplaced items.

High TemperatureIndustrial OvenDrying ProcessObject DetectionProcess ControlAutomated ManufacturingNon-flush Installation
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