LJ12A3-4-Z/BY Inductive Proximity Sensor – PNP NO

LJ12A3-4-Z/BY Inductive Proximity Sensor – PNP NO, M12 Cylindrical

The LJ12A3-4-Z/BY is a high-performance inductive proximity sensor with a PNP Normally Open (NO) output, designed to detect metallic objects without physical contact. Its compact cylindrical M12 body makes it easy to mount on machines, breadboards, and control panels.

This sensor operates using electromagnetic induction: it generates a magnetic field and senses disturbances caused by nearby metal (typically ferromagnetic), triggering a switching output when the object is within a 4mm range. With IP67-rated housing, it’s built to withstand industrial environments including CNC machines, 3D printers, and automation systems.

Unlike traditional contact-based switches, the LJ12A3-4-Z/BY offers non-contact activation, improving durability and reliability. It integrates an oscillator circuit, amplifier, and switch driver, enabling accurate and fast switching responses.

Applications:

• CNC machine and industrial equipment automation

• 3D printer end-stop and metal object detection

• Position detection in robotics

• Smart industrial sensing and process control

• Conveyor belt systems

Specifications:

• Model: LJ12A3-4-Z/BY

• Sensor Type: Inductive Proximity

• Output Type: PNP Normally Open (NO)

• Detection Distance: Up to 4mm

• Voltage Range: 6V–36V DC

• Wire Configuration: 3-wire (Brown: VCC, Blue: GND, Black: Signal)

• Mounting Type: Threaded cylindrical (M12) with lock nut

• Material: Nickel-plated brass housing, plastic sensing head

• Protection Rating: IP67 (dustproof, waterproof)

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

• Cable Length: Approx. 1 meter

• Product Type: Inductive Proximity Sensor (3D Printer Probe)

• Detectable Material: Iron / Ferromagnetic metals

• Output Current: 200–300mA DC

• Thread Diameter: 12mm

• Probe Head Diameter: 10.5mm

• Shell Length: 62mm

• Wire Length: Approx. 120 cm

• Mounting: Threaded cylindrical with nut (easy mounting on printer head or bed)

Features:

• Non-contact metal sensing with fast and reliable switching

• Built-in signal amplifier and switching circuit

• Long-lasting and maintenance-free operation

• Easy integration with Arduino, Raspberry Pi, and industrial PLCs

• Suitable for both DIY projects and industrial automation