Pepperl+Fuchs NJ15+UI+N Proximity Sensor

Pepperl+Fuchs NJ15+U1+N — VariKont NAMUR Inductive Proximity Sensor

(Note: the correct Pepperl+Fuchs catalog number is NJ15+U1+N — the middle character is the digit "1", not the letter "I".)

A block-style (VariKont) inductive NAMUR proximity sensor with 15 mm rated sensing range, designed for intrinsically safe position and presence detection in hazardous areas (Zone 0/1/2 gas and Zone 20/21/22 dust). It is used in conjunction with a Pepperl+Fuchs isolated switch amplifier / NAMUR barrier.

Key Technical Specifications

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Advantages & Features

• Intrinsically safe NAMUR output — low-energy 2-wire circuit safe for Zone 0 gas and Zone 20 dust; pairs directly with P+F K-System isolated barriers (e.g. KHA6-SH-Ex1).
• 15 mm sensing range in a compact flush-mount block — long enough to avoid mechanical contact/wear, short enough for precise position detection.
• Wide temperature range — operates from −25 to +100 °C, suitable for process-industry and outdoor installations.
• IP68 sealed PBT housing — dust-tight and continuous submersion rated; resists common chemicals and washdown.
• Global hazardous-area certifications — ATEX, IECEx, FM, cULus, cCSAus, CCC, NEPSI — approved for worldwide oil/gas, chemical and pharmaceutical projects.
• Screw-terminal M20 connection — field-wireable, no proprietary connector; accepts up to 2.5 mm² cable.
• Block (VariKont) form factor — robust against mechanical shock and vibration; standard 40×40 mm housing with long mounting slots for adjustment.
• No wear, no contact bounce — solid-state inductive sensing for long life in high-cycling machinery.

Typical Applications

• Position / end-of-travel / home-position detection in valves, actuators and cylinders in hazardous areas
• Limit and interlock sensing on rotating machinery, conveyors and elevators in oil & gas, petrochemical and chemical plants
• Presence detection on packaging, filling and bottling lines in food/pharma with ATEX-rated zones
• Machine safety gate and door monitoring when used with a certified safety switch amplifier
• Level, feeder and jam detection on bulk-handling equipment
• Offshore platforms, refineries, tank farms, paint booths and grain/ dust-handling facilities
• Retrofit of existing NAMUR sensor loops (replaces older NJ/NJ50/NJ20 variants on the same mounting)