Capacitive Proximity Sensors Description : Capacitive proximity sensor is non-contact sensing solution to metallic as well as non-metallic objects. With adjustable sensitivity almost any medium can be detected with desired reliability. Design and Principle.. The primary functional element of Capacitive proximity switch is high frequency oscillator with floating electrode in the transistor base circuit. In non-activated state, noise field exists in region of base electrode which represents active area of proximity switch. When medium appears in active area, oscillations begin. The switching stage rectifies and switches high frequency oscillations, resulting DC signal triggers output stage. Switching stage includes signal feedback system, level of which can be adjusted by potentiometer, thus providing presentable response sensitivity of switch.
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