LJ12A3-4-Z/BX M12 Inductive Proximity Sensor NPN NO (5–36V DC)

The LJ12A3-4-Z/BX M12 Inductive Proximity Sensor NPN NO is a cylindrical 12mm threaded metal-body proximity sensor that detects metallic objects within a 4mm sensing range using electromagnetic induction, outputting an NPN Normally Open signal on a three-wire 11cm cable at operating voltages from 5V to 36V DC. The lj12a3-4-z/bx inductive proximity sensor achieves a 200Hz response frequency — meaning the sensor can register up to 200 individual detection events per second — making it suitable for high-speed counting, rotary position sensing, and fast-moving conveyor metal detection builds that slower sensors cannot handle reliably.

Per the inductive proximity sensor lj12a3 4 z bx datasheet, the /BX suffix on the LJ12A3 series denotes the NPN output type with NO (Normally Open) contact logic — when no metal is present, the output transistor is off and the signal line is floating high through an external pull-up. When a metal target enters the 4mm zone, the output transistor conducts and pulls the signal LOW. The inductive proximity sensor lj12a3 4 z bx npn three-wire connection uses Brown (VCC), Blue (GND), and Black (Signal) wires following IEC standard proximity sensor colour coding. The inductive proximity metal sensor 12mm body threads into standard M12 sensor brackets and mounting blocks.

The inductive proximity sensor npn NPN open-collector output requires an external pull-up resistor — typically 10kΩ to VCC — when connecting to Arduino digital input pins for reliable HIGH level reading. This StemVolt module is a practical choice for engineers building metal detection and high-speed position sensing embedded electronics projects.

Related Product:

• Explore the M12 Inductive Proximity Sensor PNP 

Features:

• 200Hz response frequency suits high-speed counting and rotary sensing builds
• NPN NO output sinks current on metal detection with 300mA capacity
• 5V to 36V wide range compatible with Arduino and 24V PLC inputs
• IEC colour-coded Brown Blue Black three-wire 11cm pre-wired cable
• M12 12mm threaded metal body for standard industrial bracket mounting

Technical specifications:

 Applications:

• LJ12A3-4-Z/BX Sensor used for high-speed conveyor metal part counting
• College project uses lj12a3-4-z/bx inductive proximity for CNC end-stop
• Rotary encoder uses inductive proximity sensor npn for gear tooth counting
• Robot uses inductive proximity metal sensor for gripper metal detection
• PLC system uses m12 proximity sensor npn for 24V position input signal

Package includes:

• 1 x M12 Inductive Proximity Sensor NPN NO