The Proximity Sensors are commonly use in Industrial Automation for object detection, position, inspection, and counting, Part detection on industrial conveyor systems. also for Collision detection on robots.
Capacitive proximity sensors are used for non-contact detection of metallic objects & nonmetallic objects (liquid, plastic, wooden materials and so on). Capacitive proximity sensors use the variation of capacitance between the sensor and the object being detected. When the object is at a preset distance from the sensitive side of the sensor, an electronic circuit inside the sensor begins to oscillate.