Capacitive proximity sensors creates an electrical charge. Detection occurs when a metal object enters its magnetic field causing the sensor to switch the normally open or closed output. Inductive proximity sensors creates an alternating magnetic field. Ultrasonic Sensors operate in diffuse, reflex, and thru-beam modes. It performs contactless, reliable, and high-performance detection regardless of the target’s shape, texture, colour, or transparency. Detection occurs when the pulse returns in a shorter period. An ultrasonic sensor uses a transducer to send and receive bounced back ultrasonic sound wave pulses.
Detection occurs when an object enters the transmitted light beam changing the intensity of the light at the receiver whereby the output of the sensor changes state. A photoelectric sensor comprises of a light transmitter (light-emitting diode) and a light-sensitive receiver (photo-transistor). Photoelectric, ultrasonic and proximity sensors detect the presence of objects without physical contact.
