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

The LJ12A3-4-Z/BX is a 5mm inductive NPN proximity sensor designed for non-contact detection of metallic objects. Compact, reliable, and easy to integrate with automation systems, it’s ideal for industrial control, robotics, and Arduino projects.

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

Parameter	Details
Model	LJ12A3-4-Z/BX
Sensing Distance	5mm
Output Type	NPN Normally Open (NO)
Operating Voltage	DC 6–36V
Load Current	≤200 mA
Switching Frequency	1 kHz typical
Hysteresis	5–15%
Operating Temperature	-25°C to +70°C
Protection	Short circuit and reverse polarity protection
Installation	M12 thread cylindrical

🛠 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
NodeMcu IoT proximity systems
Raspberry Pi smart monitoring projects

⚠ 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.

🎥 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.