Capacitive proximity sensor SENSOPART

Capacitive sensors

The non-contact capacitive sensor transforms a dimension important for production technology (distance or fill level) into a signal for further evaluation. It functions on the basis of the modification of the electrical field surrounding its active zone. The basic structure of the sensor consists of a RC oscillator as sensor, a demodulator and an amplifier. Metals or non-metals which come close to the active zone of the capacitive sensor cause a capacity change, so that the RC oscillator begins to oscillate. As a result, the trigger downstream from the oscillator switches and the signal amplifier alters its output status. Depending on the type of device, the switching function at the output can be N.C, N.O or a change-over contact.

Applications

The capacitive proximity switches are suitable for the control and monitoring of machine processes and as signal transmitters for counting tasks, which involve metals and non-metals; for signalling levels in containers and through container walls, where liquid, powdered or grained substances are to be detected.

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