LJ12A3-4-Z/BX – 5mm Inductive NPN Proximity Sensor

The LJ12A3-4-Z/BX is a high-performance inductive proximity sensor that detects metallic objects without physical contact. Its compact cylindrical design with a 5mm sensing distance allows easy integration into automation equipment, robotics, and DIY electronics. The NPN output type provides a sinking signal compatible with Arduino, NodeMcu, and PLC systems.

Ideal for conveyor monitoring, industrial machinery, position detection, or DIY smart projects, this sensor ensures precise, fast, and reliable detection in a compact, durable housing.

✨ Key Features

• Sensing type: Inductive (metal objects)

• Output type: NPN Normally Open (NO)

• Sensing distance: 5mm

• Voltage: DC 6–36V

• Compact cylindrical housing (M12 thread)

• High switching frequency

• Non-contact detection for durability

• Compatible with Arduino, NodeMcu, PLCs, and robotic controllers

🔧 Technical Specifications

🛠 Applications

Industrial Automation

• Conveyor belt object detection

• Position sensing in CNC and machinery

• Safety interlocks in industrial equipment

Robotics & Electronics Projects

• Object proximity detection for robotic arms

• DIY automation and smart devices

• Arduino proximity-controlled projects
  👉 https://electroway.org/product-category/arduino-and-accessories/arduino-boards/

• NodeMcu IoT proximity systems
  👉 https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/

• Raspberry Pi smart monitoring projects
  👉 https://electroway.org/product-category/electronic-accessories/mounts-and-cases/raspberry-pi-mounts-and-cases/

⚠ Precautions

• Avoid sensing non-metallic objects; only detects metals.

• Maintain recommended sensing distance for accuracy.

• Do not expose to strong electromagnetic interference.

• Ensure proper wiring to prevent reverse voltage damage.

• Avoid mechanical shock or excessive bending of the cable.

🔗 Internal Category Links

• Electronics Components: https://electroway.org/product-category/electronics-components/

• Arduino & Accessories: https://electroway.org/product-category/arduino-and-accessories/

• Tools & Accessories: https://electroway.org/product-category/tools-and-accessories/

• ICs: https://electroway.org/product-category/ics/

🎥 YouTube Tutorial Video

Watch Video:https://www.youtube.com/watch?v=FmSIh55cbyo

4. Product Summary

The LJ12A3-4-Z/BX is a reliable, compact, 5mm NPN inductive proximity sensor designed for industrial automation, robotics, and DIY electronics. It offers non-contact metal detection, high switching frequency, and compatibility with Arduino, NodeMcu, and PLC systems.