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LJ12A3-4-Z/BY PNP DC 6-36V 4mm Tube Type Inductive Proximity Sensor Switch

LJ12A3-4-Z/BY PNP DC 6-36V 4mm Tube Type Inductive Proximity Sensor Switch

β‚Ή153.00Price
βš™οΈ Inductive Proximity Sensor (LJ12A3-4-Z/BY)
 
🧩 Overview
  • Industrial non-contact metal detection sensor
  • Type: Inductive Proximity Sensor (PNP, Normally Open)
  • Detects metal objects only
  • Cylindrical M12 tube-type design
  • Used in automation, CNC, robotics, 3D printers
βš™οΈ Working Principle
  • Sensor generates an electromagnetic field
  • When metal comes near β†’ eddy currents are induced
  • This disturbs the magnetic field
  • Sensor detects change β†’ switches output ON/OFF
πŸ‘‰ Works without physical contact (no wear & tear)
πŸ“Š Key Specifications
  • πŸ”Ή Operating Voltage: 6V – 36V DC
  • πŸ”Ή Output Type: PNP, Normally Open (NO)
  • πŸ”Ή Detection Distance: 4 mm
  • πŸ”Ή Output Current: Up to 300 mA
  • πŸ”Ή Sensor Diameter: 12 mm (M12 thread)
  • πŸ”Ή Response Frequency: ~0.5 kHz
  • πŸ”Ή Operating Temperature: -25Β°C to +70Β°C
  • πŸ”Ή Cable Length: ~1–1.2 m
  • πŸ”Ή Protection: Reverse polarity & short-circuit protection
πŸ”Œ Wire Configuration (3-Wire PNP)
  • 🟀 Brown β†’ VCC (+6–36V)
  • πŸ”΅ Blue β†’ GND
  • ⚫ Black β†’ Output (signal)
πŸ‘‰ Output becomes HIGH when metal is detected
πŸ”„ Features
  • Non-contact detection (no mechanical wear)
  • High repeatability & accuracy
  • Fast switching response
  • Resistant to dust, oil, vibration
  • Built-in LED indicator
  • Suitable for harsh industrial environments
πŸ› οΈ Applications
  • CNC machines & automation 🏭
  • 3D printer auto bed leveling
  • Conveyor belt object detection
  • Position sensing in robotics πŸ€–
  • Limit switch replacement
  • Metal detection systems
⚠️ Usage Tips
  • Detects only metal (not plastic/wood)
  • Maintain distance ≀ 4mm for detection
  • Use proper voltage (β‰₯6V required)
  • For microcontrollers β†’ use voltage divider or relay
  • Ensure correct PNP/NPN selection before wiring
βœ… Advantages
  • No physical contact β†’ long lifespan
  • High durability in industrial use
  • Fast and reliable switching
  • Easy installation (threaded mount)
⚠️ Limitations
  • Cannot detect non-metal objects
  • Fixed detection distance (not adjustable)
  • Requires higher voltage than Arduino (needs interface circuit)
πŸ” Summary
  • Inductive proximity sensor (PNP NO)
  • Detects metal objects within 4mm range
  • Operates on 6–36V DC
  • Ideal for industrial automation & robotics
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