NJK-5002C Tubular NPN 3 Wire Proximity Sensor Switch DC 6-36V

The NJK-5002C Proximity Sensor is a reliable non-contact magnetic (Hall-effect) proximity switch designed for industrial automation, robotics, and detection systems. With its tubular M12 metal body and wide operating voltage range, it is ideal for detecting metal objects or magnets without physical contact.

This sensor outputs a digital NPN normally-open (NO) signal, making it easy to interface with microcontrollers, PLCs, and relay circuits.

Key Features

• Wide Voltage Range: Operates on 6V to 36V DC, suitable for industrial and DIY applications
• Magnetic / Metal Detection: Detects magnetic materials or metal objects using Hall-effect sensing
• 3-Wire NPN Output: Normally Open (NO) transistor output for easy interfacing
• Non-Contact Operation: No physical wear, ensuring long life and reliability
• LED Indicator: Built-in LED shows detection status in real time
• Compact Tubular Design: M12 threaded body for easy mounting
• Fast Response: Suitable for high-speed detection applications

Technical Specifications

• Model: NJK-5002C
• Sensor Type: Hall Effect / Magnetic Proximity Sensor
• Operating Voltage: 6V – 36V DC
• Output Type: NPN, Normally Open (NO), 3-wire
• Detection Distance: ~0–10mm (±10%)
• Output Current: Up to 150mA (typical safe load)
• Operating Temperature: -25°C to +55°C
• Response Frequency: Up to ~300Hz–500Hz
• Body Size: M12 cylindrical metal housing
• Cable Length: ~1 meter

Working Principle

The sensor uses a Hall-effect element to detect magnetic fields. When a magnet or metal object enters the sensing range:

• Sensor detects magnetic field
• Output transistor activates (NPN sinks current)
• LED indicator turns ON

It is commonly triggered by the south pole of a magnet within its sensing range

Wire Configuration

• Brown → VCC (+6V to 36V)
• Blue → GND
• Black → Output (NPN Signal)

Applications

• Industrial automation systems
• Conveyor belt object detection
• Motor speed sensing (RPM measurement)
• Limit switches and position sensing
• Magnetic detection systems
• Arduino / PLC interfacing projects

Advantages

• Long lifespan due to contactless sensing
• High reliability in harsh environments
• Simple installation with threaded body
• Compatible with a wide range of control systems

Usage Tips

• Use a pull-up resistor when interfacing with microcontrollers
• Works best with strong magnets or ferromagnetic materials
• Maintain proper alignment for consistent detection
• Avoid using directly with 5V logic without proper interfacing

Note: Images are for Illustration Purposes Only.