Inductive Proximity Sensor (LJ12A3-4-Z/BX)

Inductive Proximity Sensor (LJ12A3-4-Z/BX) is a non-contact metal detection sensor designed for automation, CNC machines, robotics, and industrial applications. It detects metallic objects within a specified range without requiring physical contact, ensuring longer durability and reliable operation compared to mechanical switches.

This sensor works on the principle of electromagnetic induction, allowing it to detect ferrous and non-ferrous metals within a 4mm sensing distance. The LJ12A3-4-Z/BX model comes in a cylindrical threaded housing (M12 size) for easy installation with lock nuts, making it ideal for integration into control panels, machinery, and 3D printers (commonly used as an auto bed leveling sensor).

It operates on a DC 6–36V input and provides an NPN Normally Open (NO) output, making it compatible with controllers like Arduino, PLCs, and other automation systems. With its high sensitivity, durability, and stable performance, this inductive proximity sensor is a must-have for industrial and DIY automation projects.

Key Features:

• Model: LJ12A3-4-Z/BX
• Type: Inductive proximity sensor
• Detection Range: 4mm (varies with target metal type)
• Output Type: NPN Normally Open (NO)
• Operating Voltage: DC 6–36V
• Output Current: ≤300mA
• Response Frequency: ≤500Hz
• Housing: Cylindrical threaded metal body (M12)
• Indicator: Built-in LED for detection status
• Easy to install with lock nuts
• Non-contact, wear-free operation

Applications:

• CNC machines and 3D printers (auto bed leveling)
• Robotics and automation projects
• Metal detection and counting systems
• Conveyor belt object detection
• Industrial process control and safety switches

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