A capacitive sensor is a technology, derived from the dielectric coupling, which is able to detect and measure almost anything which is conductive. One of the most commonly used Capacitive Sensors in industrial applications is the Electrostatic Capacitor (ECC). This device is very common in many processes and it can be used as either input or output, depending upon its level of sensitivity. It is often integrated with a variety of devices such as Capacitive Touch Screen, Infrared Thermometer, Ultrasonic Door and Window Mitigation and Lift-off Drives, and many other automated systems. It is also used in high voltage power supplies and in automation systems.
The capacitive sensor was developed in the late 20th century and it is now widely used in many industries. There are three different types of Capacitive Sensors: Capacitive, Absorption, and Capacitive-Ion-Doover. The capacitive sensor has the ability to sense changes in its surrounding capacitance. Due to this ability of the Capacitive Sensor, it can determine the presence of a charging device on an object and can work even when the surrounding is very dry, non-conductive, or non-coated. It works well with moisture because its sensitive nature allows it to function even in those cases where moisture is present. The principle behind the operation of this kind of sensor is similar to ultrasound technology.
Capacitive sensors have an advantage over resistive sensors because they are sensitive enough to pick up slight changes in the electrical field around them. Also, they are safer to use than resistive ones because their reaction to changes in electromagnetic fields is much slower. They can operate at higher sensitivity for a longer period of time than resistive sensors. Thus, the capacitive sensor has more practical applications than the resistive one.
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