How Do Capacitive Proximity Sensors Work?
When a capacitive proximity sensor is used, it detects a change between the dielectric constant between the two plates of the sensor. These sensors take a little more time to react, and are set to a switching frequency of 50 Hz as a result. Opaque containers or dust do not affect them and can replace optical sensors or devices. Capacitive sensors typically have a 10 mm sensing range that is 30 mm in diameter and use a potentiometer to fine tune the sensing range with an operating temperature of -14 to 158 degrees Fahrenheit.
