Pro-Range CLJ-A12-4APB Inductive Proximity Sensor, 4mm Detection, PNP Output, M12 Thread

The CLJ-A12-4APB 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.

This sensor detects both ferrous (like steel and iron) and non-ferrous metals (like aluminum, copper, and brass). The actual sensing distance may vary slightly depending on the metal's conductivity and permeability; ferrous metals are typically detected at the full 4mm rated distance.

Connect the brown wire to the positive DC supply (10-30V), the blue wire to the negative/ground, and the black wire as the PNP output signal. The output (black wire) will provide the positive supply voltage when a metal target is within the 4mm detection range. Always ensure correct polarity to activate the built-in protection features.

No, inductive sensors cannot detect non-metallic objects like plastic, wood, or glass. The sensing field is electromagnetic and requires a conductive metal target to cause a detectable change. The sensor may also have reduced range if mounted behind thin, non-metallic barriers, but it cannot sense the barrier itself.