Generic LJ4A3-1-Z/BY Inductive Proximity Sensor, PNP NO, 1mm Detection Range, 12-24VDC, IP65, Brass-Nickel Housing

This LJ4A3-1-Z/BY sensor has a PNP (sourcing) output. When activated, it switches the signal line to the positive supply voltage. This is commonly used with PLCs that have a common negative (sinking) input. An NPN (sinking) sensor would switch the signal to ground instead. Always verify your controller's input type before wiring.

This sensor can detect both ferrous (like iron and steel) and non-ferrous metals (like copper, aluminum, and brass). The sensing distance may vary slightly depending on the target material's conductivity and magnetic permeability, with steel typically providing the maximum nominal range of 1mm.

Connect the brown wire to the positive DC supply (12-24VDC), the blue wire to the DC common (0V), and the black wire is the PNP output signal. When a metal target is within range, the black wire will source current to your load (e.g., a PLC input). Ensure you connect a suitable load (up to 150mA) between the black wire and ground.

IP65 signifies the sensor is dust-tight (IP6X) and protected against low-pressure water jets from any direction (IPX5). This allows for reliable use in industrial environments with airborne dust, chips, or occasional splashing from washdowns. It is not suitable for submersion or high-pressure, direct water streams.

No, this is a non-adjustable (fixed-distance) inductive proximity sensor. The nominal sensing distance is factory-set to 1mm. For installation, you must physically position the sensor so the target passes within 0.7mm (the guaranteed operating point) to ensure reliable switching.