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electrical center b2c

LJ8A3 Inductive Proximity Sensor M8 12-24V NPN/PNP NO/NC

$32.00 NZD
$32.00 NZD
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Shipping calculated at checkout.
Model NO.

LJ8A3 series M8 inductive proximity switch for metal detection. Available in 1mm (flush) / 2mm (non-flush) sensing distance, with NPN/PNP NO/NC, 2-wire/3-wire/4-wire options. 6-36V DC, 300mA load, built-in LED, waterproof oilproof, stable performance for industrial automation.

1. Specification


  • Model: LJ18A3 series (e.g., LJ8A3-2-Z/BX, LJ8A3-1-Z/BX, LJ8A3-2-Z/EZ)
  • Mounting Style:
    • Flush (Flat Head): 1mm sensing range, can be fully recessed in metal surfaces.
    • Non-Flush (High Head):2mm sensing range, longer detection distance.

  • Output Types:
    • NPN/PNP: 3-wire (NO/NC) or 4-wire (NO+NC) DC outputs.
    • 2-wire DC/AC: Simple wiring, compatible with most control systems.


2. Key Features


✅ Stable & Sensitive Performance: Built-in smart sensing chip for fast response (<2ms) and strong anti-interference.

✅ Waterproof & Oilproof: Durable nickel-plated brass housing and ABS sensing head for harsh industrial environments.

✅ Short-Circuit & Reverse Polarity Protection: Built-in circuit protection ensures long-term reliability.

✅ LED Status Indicator: Clear visual feedback: LED lights up when detecting metal (NO models), turns off when detecting (NC models).

✅ High-Quality Pure Copper Cable: 1.2m thickened copper wire (customizable length), durable, tensile-resistant, and not easy to break.

3. Metal Detection Performance


Sensing distance varies by target material (reference to standard iron):

  • Iron: Full rated sensing range (Sn)
  • Stainless Steel: ~0.8Sn
  • Brass: ~0.6Sn
  • Nickel-Plated Metal: ~0.5Sn
  • Aluminum: ~0.4Sn

LJ18A3 Inductive Proximity Sensor

Attribute Details
Brand Electrical Center B2C
Model LJ8A3 Series
Product Type Inductive Proximity Sensor
Thread Size M8
Mounting Type Flush Mount / Non-Flush Mount
Sensing Distance Flush: 5mm ±10%

Non-Flush: 8mm ±10%
Operating Voltage DC 6~36V
Output Mode 3-wire NPN NO / 3-wire NPN NC / 4-wire NPN NO+NC

3-wire PNP NO / 3-wire PNP NC / 4-wire PNP NO+NC

2-wire DC NO / 2-wire DC NC

2-wire AC NO / 2-wire AC NC
Rated Load Current ≤ 300mA
Response Time ≤ 2ms
Housing Material Nickel-plated Brass
Sensing Head Material ABS Plastic
Standard Cable Length 1.2m (Customizable)
Built-in Indicator LED Status Light
Protection Function Short-circuit protection, Reverse polarity protection, Surge protection, Waterproof, Oil-proof, Anti-interference
Operating Temperature -25℃ ~ +70℃
Application Industrial automation, Conveyor equipment, Machine tools, Metal processing machinery, PLC control system

 

LJ18 Series Inductive Proximity Switches Model Chart

Output Type Flush Mount (Embedded) Non-Flush Mount (Non-Embedded)
NPN DC Type NO (Normally Open) LJ8A3-1-Z/BX LJ8A3-2-Z/BX
NC (Normally Closed) LJ8A3-1-Z/AX LJ8A3-2-Z/AX
PNP DC Type NO (Normally Open) LJ8A3-1-Z/BY LJ8A3-2-Z/BY
NC (Normally Closed) LJ8A3-1-Z/AY LJ8A3-2-Z/AY
2-Wire DC Type NO (Normally Open) LJ8A3-1-Z/EX LJ8A3-2-Z/EX
NC (Normally Closed) LJ8A3-1-Z/DX LJ8A3-2-Z/DX
2-Wire AC Type NO (Normally Open) LJ8A3-1-J/EZ LJ8A3-2-J/EZ
NC (Normally Closed) LJ8A3-1-J/DZ LJ8A3-2-J/DZ
Sensing Distance 1mm ±10% 2mm ±10%

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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