Pro-Range XKC-Y27C-NPN Non-Contact Liquid Level Sensor - DC 5-24V, NPN Output, IP67

The sensor is designed for non-contact detection through non-metallic walls, with a typical effective sensing distance of up to 10mm. The actual maximum wall thickness depends on the material's dielectric constant; performance is best with thinner walls of plastics like PVC, polypropylene, or glass. The adjustable sensitivity potentiometer can help optimize detection for specific material and thickness combinations.

The sensor's NPN output is an open-collector transistor. Connect the brown wire to your positive supply (5-24V DC), the blue wire to ground (0V), and the black wire is the signal output. To read the signal with a PLC digital input or microcontroller, connect the black wire to your input pin and use a pull-up resistor to your logic voltage (e.g., 3.3V or 5V). The output switches to ground (low) when liquid is detected.

No, this specific capacitive non-contact sensor is designed exclusively for use with non-metallic containers. Metal tanks shield the capacitive field, preventing reliable detection. For metal tanks, you would require a different sensing technology, such as an ultrasonic sensor mounted above the liquid, a float switch, or a contact-based conductive or pressure sensor.

The sensitivity adjustment allows you to fine-tune the sensor's trigger point for optimal performance with your specific container material, wall thickness, and liquid type. To calibrate, install the sensor on the empty container at the desired detection point. Slowly adjust the potentiometer until the sensor's output LED just turns off (indicating 'empty'). Then, fill the container to the detection level and verify the LED turns on (indicating 'full').