Capacitive Proximity Sensor Dealers in Nashik

Detection Principle of Capacitive Proximity Sensors Capacitive Proximity Sensors detect changes in the capacitance between the sensing object and the Sensor. The amount of capacitance varies depending on the size and distance of the sensing object. An ordinary Capacitive Proximity Sensor is similar to a capacitor with two parallel plates, where the capacity of the two plates is detected. One of the plates is the object being measured (with an imaginary ground), and the other is the Sensor's sensing surface. The changes in the capacity generated between these two poles are detected.The objects that can be detected depend on their dielectric constant, but they include resin and water in addition to metals.

Capacitive Proximity Switches are used for the non-contact detection of any objects. In contrast to inductive switches, which only detect metallic objects, capacitive sensors can also detect non-metallic materials. Typical application are in the wood, paper, glass, plastic, food and chemical industries. Capacitive Sensors for example monitor that the contents of a cardboard box are complete or check the presence of the non-metallic caps. Another application is to monitor the conveying of sheets of glass on a roller conveyor. The capacitance between the active electrode of the sensor and the electrical earth potential is measured. An approaching object influences the electrical alternating field between these two " Capacitor Plates". This applies to metallic and non-metallic objects. In principle, capacitive sensors work with an RC oscillator. A very small change in capacitance is enough to influence the oscillation amplitude. The evaluation electronics converts this into switched signal. The user can set the sensitivity with a potentiometer. 

Capacitive Proximity Sensors, Automation Products, Control Device