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Capacitive Sensor

A capacitive sensor is a proximity sensor that detects nearby objects by their effect on the electrical field created by the sensor

Capacitive Sensor


Capacitive sensors are used for non-contact detection of metallic objects & nonmetallic objects



A capacitive sensor is a proximity sensor that detects nearby objects by their effect on the electrical field created by the sensor. In electrical engineering, capacitive sensing (sometimes capacitance sensing) is a technology, based on capacitive coupling, that can detect and measure anything that is conductive or has a dielectric different from air.

Capacitive sensors are used for non-contact detection of metallic objects & nonmetallic objects (liquid, plastic, wooden materials and so on). Capacitive proximity sensors use the variation of capacitance between the sensor and the object being detected. When the object is at a preset distance from the sensitive side of the sensor, an electronic circuit inside the sensor begins to oscillate. The rise or fall of such oscillation is identified by a threshold circuit that drives an amplifier for the operation of an external load. A screw placed on the backside of the sensor allows regulation of the operating distance. This sensitivity regulation is useful in applications, such as detection of full containers and non-detection of empty containers.


Applications of Capacitive Sensors

Level Control of Liquids Level Control of Solids Pile-up Control Feed Hopper Level Monitoring
Small Vessel Pump Control Grease Level Monitoring Pharmaceuticals Manufacturing Suitable for Use with Chemicals
Pipeline Leak Detection Vessel Leak Detection Position and displacement detection


Advantages of capacitive Sensors

High sensitivity Useful for small system. High frequency Response
Low Power Consumption Less loading effect due to high input impedance.