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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

₹153.00Price

⚙️ 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

⚙️ Working Principle

  • Sensor generates an electromagnetic field

  • When metal comes near → eddy currents are induced

  • This disturbs the magnetic field

  • Sensor detects change → switches output ON/OFF

👉 Works without physical contact (no wear & tear)

📊 Key Specifications

  • 🔹 Operating Voltage: 6V – 36V DC

  • 🔹 Output Type: PNP, Normally Open (NO)

  • 🔹 Detection Distance: 4 mm

  • 🔹 Output Current: Up to 300 mA

  • 🔹 Sensor Diameter: 12 mm (M12 thread)

  • 🔹 Response Frequency: ~0.5 kHz

  • 🔹 Operating Temperature: -25°C to +70°C

  • 🔹 Cable Length: ~1–1.2 m

  • 🔹 Protection: Reverse polarity & short-circuit protection

🔌 Wire Configuration (3-Wire PNP)

  • 🟤 Brown → VCC (+6–36V)

  • 🔵 Blue → GND

  • Black → Output (signal)

👉 Output becomes HIGH when metal is detected

🔄 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

🛠️ Applications

  • CNC machines & automation 🏭

  • 3D printer auto bed leveling

  • Conveyor belt object detection

  • Position sensing in robotics 🤖

  • Limit switch replacement

  • Metal detection systems

⚠️ Usage Tips

  • Detects only metal (not plastic/wood)

  • Maintain distance ≤ 4mm for detection

  • Use proper voltage (≥6V required)

  • For microcontrollers → use voltage divider or relay

  • Ensure correct PNP/NPN selection before wiring

✅ Advantages

  • No physical contact → 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)

🔍 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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