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Inductive Proximity Sensor Switch – LJ12A3-4-Z/BX NPN Normally Open (NO) Metal Detection Switch with 4mm Sensing Range and DC 6-36V Operating Voltage

Inductive Proximity Sensor Switch – LJ12A3-4-Z/BX NPN Normally Open (NO) Metal Detection Switch with 4mm Sensing Range and DC 6-36V Operating Voltage

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ParameterDetailed Specification
Model NumberLJ12A3-4-Z/BX
Output ConfigurationNPN Normally Open (NO)
Sensing Distance4mm ± 10%
Operating VoltageDC 6V to 36V
Switching FrequencyUp to 500 Hz
Thread SizeM12 (12mm Diameter)
Protection RatingIP67 (Dust and Water Resistant)
Price
₹ 177.97 ₹ 177.97
(Tax included)

Product Description

The LJ12A3-4-Z/BX is a high-reliability, industrial-grade inductive proximity sensor designed for non-contact metal detection. Unlike traditional mechanical limit switches, this sensor utilises electromagnetic fields to detect metallic objects, eliminating physical wear and extending operational life. As an NPN Normally Open switch, the signal remains high impedance until a magnetic metal (such as iron or steel) enters its sensing range, at which point the output is pulled to Ground (GND). This makes it an essential component for high-precision applications, including CNC end-stops, 3D printer auto-levelling, and automated production counting systems.

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Detailed Key Features

  • Wear-Free Operation: Non-contact sensing removes the risk of mechanical degradation, making it more durable than standard switches.

  • Universal Metal Detection: Specifically engineered to detect magnetic metals such as iron and steel within a precise 4mm range.

  • Visual Status Indicator: Features an integrated red LED at the base that illuminates when an object is detected, facilitating easy setup and troubleshooting.

  • Rugged Construction: The sensor is housed in a nickel-plated brass tube with a sealed sensing face, providing resistance to water, oil, and dust.

  • High-Speed Performance: Supports switching frequencies up to 500 Hz, making it suitable for high-speed industrial counting and RPM monitoring.

Technical Specification in Details

  • Output Capacity: Capable of driving loads up to 300mA directly.


  • Long Reach Connectivity: Comes with an integrated ~1-meter cable for flexible installation.


  • Hysteresis Control: Features a low hysteresis of less than 10% of the sensing distance for consistent trigger points.

  • Wide Voltage Tolerance: Operates reliably across a broad DC range from 6V to 36V, compatible with both battery systems and PLCs.


  • Precision Dimensions: Compact 62mm body length with standard M12 threading for easy mounting in industrial brackets.


Prototyping & Engineering Tips (Robogears Exclusive)

  • Standard Wiring Logic: Always follow the standard colour code: Brown (+VCC), Blue (-GND), and Black (Signal Output).

  • Arduino/Microcontroller Safety: Since this sensor outputs a "LOW" (GND) signal when triggered and often runs on 12V, use a voltage divider or optocoupler on the signal wire when connecting to 5V digital pins to prevent overvoltage damage.

  • Sensing Face Protection: Ensure the front ABS sensing face is kept free of metallic shavings or magnetic dust, as buildup can cause false triggers or permanent "ON" states.

  • Mounting Security: Use the included nuts and washers to lock the sensor in place; however, avoid over-tightening the nuts to prevent cracking the internal sensor housing.

Package Includes

  • 1 x LJ12A3-4-Z/BX Inductive Proximity Sensor

  • 2 x Mounting Nuts and Washers

Image Disclaimer

Image shown is for illustrative purposes only; the actual product may vary slightly in design, color, or component layout due to manufacturing updates, though all technical specifications will remain as described.