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electrical center b2c

LJ12A3 Inductive Proximity Sensor M12 12-24V NPN/PNP NO/NC

$16.90 USD
$16.90 USD
Sale Sold out
Shipping calculated at checkout.
Model NO.

LJ12A3 M12 inductive proximity switch, 2mm (flush) / 4mm (non-flush) sensing range. NPN/PNP, 2-wire/3-wire/4-wire NO/NC options. 6-36V DC, 300mA load, built-in LED, durable brass housing, ideal for industrial automation metal detection.

1. Specification

✅ Two Mounting Styles

  • Flush (Flat Head): 2mm sensing range, can be fully recessed in metal panels.
  • Non-Flush (High Head): 4mm sensing range, longer detection distance.

✅ Multiple Output Options

  • NPN/PNP: 3-wire NO/NC or 4-wire NO+NC DC outputs.
  • 2-wire DC/AC: Simple wiring for direct load connection.

✅ Reliable Industrial Performance

  • Built-in short-circuit and reverse polarity protection.
  • Nickel-plated brass housing for waterproof, oil-proof, and vibration resistance.
  • Fast response time ≤ 2ms, suitable for high-speed automation.

✅ Clear Status Feedback

  • Built-in LED indicator light: turns on when detecting metal (NO models), turns off when detecting (NC models).

Specification

Attribute Details
Brand HURON
Series LJ12A3
Type Inductive Proximity Sensor
Thread Size M12
Mounting Style Flush (Flat Head, 2mm) / Non-Flush (High Head, 4mm)
Sensing Distance 2mm ±10% / 4mm ±10%
Operating Voltage DC 6~36V
Rated Load Current ≤ 300mA
Response Time ≤ 2ms
Housing Material Nickel-plated brass
Sensing Head Material ABS Plastic
Cable Length 2m (customizable)
Protection Features Short-circuit protection, reverse polarity protection, waterproof, oil-proof, anti-interference
LED Indicator Yes (ON for NO when detecting, OFF for NC when detecting)
Output Configurations 3-wire NPN NO/NC, 3-wire PNP NO/NC, 4-wire NPN/PNP NO+NC, 2-wire DC/AC NO/NC
Operating Temperature -25℃ ~ +65℃
Applications Industrial automation, conveyor systems, machine tools, PLC control, metal processing equipment

Mounting Style Sensing Distance Output Type Model
Non-Flush 4mm NPN 3-wire NO LJ12A3-4-Z/BX
Non-Flush 4mm NPN 3-wire NC LJ12A3-4-Z/AX
Non-Flush 4mm PNP 3-wire NO LJ12A3-4-Z/BY
Non-Flush 4mm PNP 3-wire NC LJ12A3-4-Z/AY
Non-Flush 4mm 2-wire DC NO LJ12A3-4-Z/EX
Non-Flush 4mm 2-wire DC NC LJ12A3-4-Z/DX
Non-Flush 4mm 2-wire AC NO LJ12A3-4-J/EZ
Non-Flush 4mm 2-wire AC NC LJ12A3-4-J/DZ
Non-Flush 4mm NPN 4-wire NO+NC LJ12A3-4-Z/CX
Non-Flush 4mm PNP 4-wire NO+NC LJ12A3-4-Z/CY
Flush 2mm NPN 3-wire NO LJ12A3-2-Z/BX
Flush 2mm NPN 3-wire NC LJ12A3-2-Z/AX
Flush 2mm PNP 3-wire NO LJ12A3-2-Z/BY
Flush 2mm PNP 3-wire NC LJ12A3-2-Z/AY
Flush 2mm 2-wire DC NO LJ12A3-2-Z/EX
Flush 2mm 2-wire DC NC LJ12A3-2-Z/DX
Flush 2mm 2-wire AC NO LJ12A3-2-J/EZ
Flush 2mm 2-wire AC NC LJ12A3-2-J/DZ
Flush 2mm NPN 4-wire NO+NC LJ12A3-2-Z/CX
Flush 2mm PNP 4-wire NO+NC LJ12A3-2-Z/CY
Plastic Body 4mm NPN 3-wire NO LJ12A4-4-Z/BX

 

NPN vs PNP Concept Explanation (Inductive Proximity Switches)

NPN vs PNP Concept Explanation


(For Inductive Proximity Switches)

  1. NPN: Common positive voltage, outputs negative voltage (low-level signal).

    PNP: Common negative voltage, outputs positive voltage (high-level signal).

  2. NPN NO (Normally Open): Normally open state when idle. When an object is detected, the black wire outputs a negative voltage signal.

  3. NPN NC (Normally Closed): The black wire outputs a voltage signal in the normal state. When an object is detected, the output signal is disconnected.

  4. PNP NO (Normally Open): Normally open state when idle. When an object is detected, the black wire outputs a positive voltage signal.

  5. PNP NC (Normally Closed): The black wire outputs a positive voltage signal in the normal state. When an object is detected, the output signal is disconnected.

Quick Summary

Type Wiring Common Output Signal NO Behavior NC Behavior
NPN V+ (Positive) Low / Negative Idle: Open, no signal

Detected: Outputs negative		 Idle: Closed, outputs signal

Detected: Stops output
PNP 0V / GND (Negative) High / Positive Idle: Open, no signal

Detected: Outputs positive		 Idle: Closed, outputs signal

Detected: Stops output

Care Instructions

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