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electrical center b2c

LJ6.5A3 Inductive Metal Sensor M6.5 Flush&Non-Flush type

$17.50 USD
$17.50 USD
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Model NO.

LJ6.5A3 series M6.5 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: LJ6.5A3 series (e.g., LJ6.5A3-2-Z/BX, LJ6.5A3-1-Z/BX, LJ6.5A3-2-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 LJ6.5A3 Series
Product Type Inductive Proximity Sensor
Thread Size M6.5
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

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

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