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
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Sensing type: Inductive (metal objects)
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Output type: NPN Normally Open (NO)
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Sensing distance: 5mm
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Voltage: DC 6–36V
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Compact cylindrical housing (M12 thread)
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High switching frequency
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Non-contact detection for durability
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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
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Conveyor belt object detection
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Position sensing in CNC and machinery
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Safety interlocks in industrial equipment
Robotics & Electronics Projects
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Object proximity detection for robotic arms
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DIY automation and smart devices
⚠ Precautions
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Avoid sensing non-metallic objects; only detects metals.
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Maintain recommended sensing distance for accuracy.
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Do not expose to strong electromagnetic interference.
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Ensure proper wiring to prevent reverse voltage damage.
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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.
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