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LJ12A3-4-Z/BY PNP NO Inductive Proximity Sensor Switch DC 6V-36V

  • Model: LJ12A3-4-Z BY
  • Distance Detection Capability: 4mm
  • Operating Voltage: DC 6V – 36V
  • Output Type: Digital PNP
  • SEO Technology: Switching Enhanced Operation
  • Protection Rating: IP67 (Resistance to dust and water)
  • Operating Temperature Range: -25°C to +70°C
  • Cable Length: Typically 2 meters, or can be optionally specified
  • Protections: Short circuit, overcurrent, and reverse polarity protections
  • Mounting: M12 connector or cable connection options
  • Indicator Light: LED indicator showing detection status
  • Material: Options of metal or plastic body
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LJ12A3-4-Z/BY PNP Inductive Proximity Sensor Switch  DC 6V-36V NO 3-Wire 4mm

The LJ12A3-4-Z/BY is a 3-wire inductive proximity sensor designed for non-contact metal detection. It features an PNP transistor output with Normally Open (NO) logic, meaning the signal wire stays “Open” (High Impedance) until a metal object is detected within its 4mm range, at which point it pulls the signal to Ground (Sink).

Description:

  • Power supply reversal connection protection; short-circuit protection can directly connect with PLC
  • Used in common places with Medium environment resistance
  • Red LED indicates that it’s available to detect the sensor operation state
  • Economical and simple operation
  • Widely used, it can be a substitution for min-type switch and limit switch
  • IP 67 Water protection

Features:

  • Theory: Inductive Sensor.
  • High Repeated Positioning Accuracy.
  • Wire type and power: DC 3-wire type 6-36VDC
  • Sensing side diameter : M12
  • Sensing distance: 4mm
  • Installation: Non-Shield(non-flush)
  • Control output: PNP Normally Open

Specifications:

  • Types: LJ12A3-4-Z/BY
  • Mounting Hole Diameter: 12 mm
  • Detecting Distance: 4 mm
  • Working Voltage: 6-36V DC,
  • Current Output: 300mA
  • Output type: PNP, NO(Normally Open)
  • Weight: 40.8 g

Wiring & Pinout

The sensor typically follows a standard 3-wire color code:
  1. Brown: Positive Supply (+VCC, 6-36V).
  2. Blue: Negative/Ground (GND).
  3. Black: Signal Output (PNP Sink).

Usage Tips

  • Microcontroller Connection: Because the sensor operates at a minimum of 6V, its signal output can damage 5V or 3.3V microcontrollers like Arduino. You should use a voltage divider or a zener diode to drop the black wire’s voltage to a safe level for your board.
  • Object Detection: Inductive sensors only detect conductive metals (iron, steel, aluminum, copper). Non-ferrous metals like aluminum will significantly reduce the effective sensing distance compared to iron.
  • Status Indicator: A red LED on the back of the sensor body provides immediate visual confirmation when a metal target is detected.

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  • Types: LJ12A3-4-Z/BY
  • Mounting Hole Diameter: 12 mm
  • Detecting Distance: 4 mm
  • Working Voltage: 6-36V DC,
  • Current Output: 300mA
  • Output type: PNP, NO(Normally Open)
  • Weight: 40.8 g

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