Pro-Range CLJ-A12-4ANA Inductive Proximity Sensor - NPN Output, M12 Thread, 4mm Detection

This sensor has an NPN (sinking) output in a normally open (NO) configuration. Connect the brown wire to your DC positive supply (6-36V), the blue wire to DC negative (0V/GND), and the black wire is the signal output. The black wire will switch to ground (sink current) when a metal target is detected. Always connect a pull-up resistor to a positive voltage on the output line if your controller requires a voltage signal.

The CLJ-A12-4ANA is designed to detect conductive metals, with the highest sensitivity for ferrous metals like mild steel. The sensing distance is specified for a standard 1mm thick square steel target. Detection of non-ferrous metals like aluminum or copper is possible but will typically require a reduced sensing distance, often 30-50% less than the rated 4mm.

The sensor typically operates from 6 to 36 Volts DC. It includes built-in protection against reverse polarity connection (connecting power backwards) and short-circuit protection on the output transistor, which enhances its durability in electrically noisy industrial environments and prevents damage from wiring mistakes.

Mount the sensor using its M12 threaded barrel. Drill a 12mm diameter hole in your mounting panel, insert the sensor, and secure it with the included lock nut (standard for this form factor). Ensure the sensing face is flush with or slightly recessed from the target surface for optimal performance. Maintain the specified lateral and axial clearance around the sensor body to prevent false triggers from the mounting bracket.