What is necessary for a capacitance proximity sensor to function correctly?

For a capacitance proximity sensor to function correctly, a good earth ground is essential. This type of sensor operates on the principle of detecting changes in capacitance caused by the presence or absence of an object, typically non-metallic or dielectric materials.

When the sensor is properly grounded, it helps in stabilizing the sensor's readings and minimizing electrical noise, which can interfere with its operation. A good earth ground serves as a reference point for the sensor, ensuring that it can accurately detect variations in capacitance resulting from nearby objects. This is critical for the sensor to provide reliable signals and avoid false triggers.

While other options may relate to general power supply or circuit setup, they do not directly address the requirements for operational accuracy and sensitivity specific to capacitance sensors.