Pro-Range CLJ-A12-4ANB NPN M12 Inductive Proximity Sensor - 4mm Detection

The CLJ-A12-4ANB has an NPN (sinking) output. This means the output switch connects the signal line to ground (0V) when activated. It is typically wired to a PLC's positive-common input. A PNP (sourcing) sensor would switch the positive voltage to the signal line. Always verify your controller's input type (sink or source) for correct compatibility.

No. Inductive proximity sensors only detect conductive materials, primarily metals. They work by inducing eddy currents in the target. Non-conductive materials like plastic, wood, or glass will not affect the sensor's electromagnetic field and therefore will not be detected. For non-metals, a capacitive or optical sensor would be required.

The standard 3-wire connection uses a brown wire for DC positive (6-36V), a blue wire for DC negative (0V/GND), and a black wire as the NPN output signal. When a metal target is detected, the black wire (output) is switched internally to connect to the blue wire (ground). Always connect a pull-up resistor (typically 1-10kΩ) between the black wire and the positive supply if your controller requires a voltage signal.

The nominal 4mm distance is specified for a standard mild steel target. Actual sensing distance can be reduced by target material (aluminum is typically 30-40% less), target size/shape (must be equal to or larger than the sensor face), and environmental factors like extreme temperatures. Always perform a bench test with your specific target material to confirm the effective range in your application.