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

The M12 Inductive Proximity Sensor NPN model LJ12A3-4-Z/BX detects metal objects within 4mm using electromagnetic induction (a magnetic field that detects nearby metal without contact). The lj12a3-4-z/bx inductive proximity sensor has a 12mm threaded cylindrical body and a short 11cm cable. It runs on 5V to 36V DC, covering both Arduino hobby builds and 24V industrial panels from the same unit.

The inductive proximity sensor lj12a3 4 z bx npn output type is NPN Normally Open Three-line, meaning the output wire floats at rest and pulls LOW when metal enters the 4mm detection zone. One non-obvious detail — you need a pull-up resistor between the output wire and your supply voltage when reading this with a microcontroller GPIO. Without it, the input reads noise and random values. The honest limitation is that the 4mm detection range applies to standard steel. Aluminium and other non-ferrous metals trigger at shorter distances.

The inductive proximity metal sensor connects to Arduino, and PLC digital inputs through the three output wires. Engineers used in automation projects and machine. To start, connect brown to positive, blue to GND, and black to GPIO with a pull-up resistor. StemVolt provides fast and reliable delivery of across India with trusted service support.

Related Product:

• Explore the M12 Inductive Proximity Sensor PNP 

Features:

• Operating voltage from 5V to 36V DC allows use with Arduino, ESP32, and 24V industrial control panels
• NPN Normally Open three-wire output pulls LOW on detection connecting to standard PLC digital inputs
• 12mm threaded body mounts in standard M12 sensor brackets without any adapter or custom fixture
• inductive proximity sensor npn short 11cm cable reduces loose wiring in tight machine enclosures

Technical specifications:

Applications:

• Object counter project uses this sensor to count metal parts moving on a conveyor belt
• End-of-travel detector uses this to sense when a steel rod reaches its home position
• M12 Inductive Proximity Sensor NPN reads gear tooth count on a rotating shaft for speed measurement
• lj12a3-4-z/bx inductive proximity reads metal cam position on a CNC axis and triggers a relay output

Package includes:

• 1 x LJ12A3-4-Z/BX M12 Inductive Proximity Sensor NPN NO