DEVICE AND METHOD FOR CAPACITIVELY MEASURING A FILL LEVEL

摘要

The invention relates to a device for capacitively determining and/or monitoring at least the fill level of a medium (4) in a container (3), comprising a probe unit (1) with at least one probe electrode (11) and comprising an electronic unit (2) which applies an electric transmission signal to at least the probe electrode (11) and which receives an electric response signal from the probe unit (1) and analyses said response signal. The invention also relates to a corresponding method. The invention is characterized in that the electronic unit (2) applies a transmission signal to the probe electrode (11) at least intermittently using a frequency search, said transmission signal having a plurality of successive discrete frequencies which lie within a specifiable frequency band. The electronic unit (2) ascertains a measuring frequency that is optimal for current use parameters using the frequency search, and the electronic unit (2) determines the fill level from the response signal of the optimal measuring frequency.