Capacitance Sensor

Capacitive sensors, like other non-contact sensors, provide a PNP or NPN transistor switch output when approaching objects, especially non-metals. As objects approach the capacitive sensor, the capacitor embedded in the sensor changes, giving the internal circuit an open or closed output by comparing it to the reference value. The capacitive sensor can be used as a pulse generator to control the program status of machines for counters and to detect almost all metallic and non-metallic materials.

For example, in controlling the level of powdered materials, one of the most widely used sensors is the capacitive sensor.

Capacitive sensors are produced in cubic and cylindrical models and depending on the production mechanism and dimensions, can sense the presence of objects at different distances. To select a capacitive sensor, the following should be considered.

1. Capacitive sensor output open or closed
2. Capacitive sensor power supply
3. How to install and shape the capacitive sensor
4. Analog or digital capacitive sensor output
5. Capacitive sensor sensing distance