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
In stock
₨ 600
In stock
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
- Brown: Positive Supply (+VCC, 6-36V).
- Blue: Negative/Ground (GND).
- 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.

- 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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