Electrodes work according to the conductive principle in connection with filling level controllers. When the electrodes are immersed into an
electrically conducting liquid, a control current will flow through the liquid. Via a measuring amplifier a switching contact will be activated by
the controlling current. The current circuit is galvanically isolated from the mains and is operated by protective extra-lowvoltage.
In order to avoid an electrolytic effect on the electrodes, they are operated with alternating voltage.