Pro-Range CCJ-A18-8APB Capacitive Proximity Sensor PNP M18 Thread 8mm Detection

This capacitive proximity sensor is specifically designed to detect non-metallic materials, such as plastics, glass, wood, liquids, powders, and granular substances. It senses changes in dielectric constant, making it unsuitable for detecting pure metals, which are better sensed by inductive proximity sensors.

The sensor has three wires: Brown (V+), Blue (V- / GND), and Black (Signal Output). Connect Brown to +10-30V DC, Blue to 0V/GND. The Black wire is the PNP output; it will switch to supply +V (sourcing) to the load when a target is detected. The load (e.g., PLC input) should be connected between the Black wire and 0V.

A potentiometer is located on the back or side of the sensor housing. Use a small screwdriver to adjust it. Turn clockwise to increase sensitivity (detect objects further away or with lower dielectric constant) and counter-clockwise to decrease it, which helps avoid false triggers from background materials.

The sensor operates from 10 to 30 Volts DC. Typical current consumption is under 15mA. Ensure your power supply can provide stable voltage within this range for reliable operation. The built-in polarity protection guards against accidental reverse connection.

Yes, it is well-suited for detecting the presence or absence of non-conductive liquids (like water, oils, or chemicals) inside non-metallic tanks or pipes. Mount the sensor externally against the tank wall or use a threaded mounting boss, adjusting sensitivity to detect the dielectric change from air to liquid.