A capacitive proximity sensor is used to detect both metallic and non-metallic objects without any physical contact. It works on the principle of capacitance change — when any object, such as plastic, wood, glass, liquid, or even powder, comes close to the sensor’s sensing surface, the capacitance between the sensor and the object changes, and the sensor detects its presence. This makes it highly versatile compared to inductive sensors, which can detect only metals.
Capacitive proximity sensors are widely used in industrial automation, packaging, food, and material-handling industries where different types of materials need to be sensed. In packaging machines, they can check if a plastic bottle is present on a conveyor or if it is filled or empty. In grain or powder processing, they help monitor the material level inside bins or hoppers. They are also used for liquid-level detection in tanks or containers, as they can sense liquids through non-metallic walls like plastic or glass. This feature is particularly useful where hygiene or sealed systems are important, such as in pharmaceutical or food industries.
These sensors are also used in conveyor systems to detect the presence or absence of items, in robotics to confirm part placement, and in printing or textile machines to monitor materials like paper or fabric. Because they can sense through thin surfaces, they are excellent for detecting hidden objects or products wrapped in non-conductive materials.
Omron capacitive proximity sensors are known for their stable performance and sensitivity adjustment, allowing accurate detection of a wide range of materials. They are built to handle harsh environments, resist dust and moisture, and maintain reliable operation even under varying temperature and humidity conditions.
A capacitive proximity sensor is mainly used wherever non-contact detection of diverse materials is needed, offering flexibility, high sensitivity, and reliable operation across many industrial applications.