LJ18A3-8-Z/BX [CHE18-8NA-A710] 18mm Proximity Sensor  

Specification

The CHE18-8NA-A710 / LJ18A3-8-Z/BX is a high-precision inductive proximity switch sensor, commonly used for non-contact detection of metal objects. It features a 3-wire NPN Normally Open output, suitable for integration with microcontrollers, PLCs, and automation systems.

Electrical Specifications

• Operating Voltage: 6V – 36V DC

• Rated Voltage: 12V – 24V DC

• Current Consumption (Idle): ≤10mA

• Output Type: NPN, Normally Open (NO)

• Max Switching Current (Load Current): ≤300mA

• Leakage Current: ≤0.8mA

• Voltage Drop Across Output (Residual Voltage): ≤1.5V @ 300mA

• Switching Frequency: 500Hz (approx.)

• Hysteresis: <15% of sensing distance

• Reverse Polarity Protection: Yes

• Short-Circuit Protection: Yes

• Output Protection: Yes (Overload and surge)

Detection Specifications

• Sensing Type: Inductive (detects metallic objects only)

• Detection Distance (Sn): 8mm ±10%

• Standard Target Material: Iron (Fe), 18 × 18 × 1mm

• Detectable Materials: Ferrous metals (best), aluminum, brass, stainless steel (with reduced range)

Physical & Mechanical Specifications

• Body Material: Nickel-plated Brass (Threaded Cylinder Type)

• Thread Type: M18 × 1mm pitch

• Sensor Length: ~60mm

• Cable Length: 1.2m – 2.0m (PVC insulated)

• Cable Type: 3-wire, 0.5mm² cross-section

  • Brown: V+ (DC Supply)

  • Blue: GND

  • Black: Signal Output (NPN NO)

• Mounting Type: Flush / Non-Flush (Shielded / Unshielded)

• Mounting Accessories: Nuts and washers included

Environmental Specifications

• Operating Temperature: –25°C to +70°C

• Storage Temperature: –40°C to +80°C

• Humidity Range: 35% – 95% RH (Non-condensing)

• Enclosure Protection Rating: IP67 (Dustproof & Waterproof)

• Vibration Resistance: 10–55Hz, 1.5mm amplitude, in X, Y, Z directions for 2 hours

• Shock Resistance: 500m/s² (50G), 3 times in each direction

Applications

• Metal detection and positioning

• Conveyor belt object detection

• Industrial automation machinery

• CNC, 3D printers, robotics

• Counting and limit position sensing

• Contactless switch for smart systems

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