LJC18A3-H-Z/BY Capacitive Proximity Sensor Switch

The LJC18A3-H-Z/BY is a cylindrical, 18mm-diameter capacitive proximity sensor switch. Unlike inductive sensors that only pick up metal, this capacitive switch can detect both metallic and non-metallic objects (such as plastic, glass, wood, water, and oil) without any physical contact. Its integrated PNP Normally Open (NO) transistor output structure outputs a high-voltage (positive) signal when a target is detected.Key Technical SpecificationsThe standard operating specifications for this model variant typically include:

• Sensor Type: Capacitive Proximity
• Output Configuration: PNP, Normally Open (NO)
• Barrel Diameter: M18 (18mm metric thread)
• Sensing Distance: 1mm to 10mm (Adjustable via a potentiometer screw on the back)
• Supply Voltage: DC 636V (highly compatible with 12V and 24V industrial systems)
• Current Output Capacity: 200mA to 300mA maximum
• Response Frequency: 100 Hz
• Body Length & Material: ~75mm; built with a blend of rigid alloy and plastic

3-Wire Color Coding & Standard WiringThis sensor features a built-in cable containing three distinct wires. Because it operates on a PNP mechanism, it acts as a “sourcing” sensor, completing the positive path to your load when triggered:

• Brown Wire: Connects to the positive supply voltage (V+ / typically +12VDC or +24VDC).
• Blue Wire: Connects to the negative supply voltage or common system Ground (0V / GND).
• Black Wire: The signal output wire. When an object is within the detection zone, this wire switches on to pass the positive input voltage down to your load or controller.