Capacitance sensor for detecting the fill level of a medium in a container

摘要: A sensor according to the invention has an amplifier that is capacitively loaded vis-a-vis ground by a container and medium contained therein capacitive feedback dimensioned in such way only oscillates when critical filling level not been reached. According invention, influenced load of input caused countered. In this manner, it achieved responds capacitance medium, largely independently magnitude capacitance. also characterized operating frequency that, on basis conductivity possible distinguish between massive apparent with simulated wetting or foam formation, but avoids those problems encountered sensors having very high more than 50 MHz.