Vibration level switch with integrated tuning fork check

摘要

The invention relates to devices and methods for level measurement or limit level determination, in particular a vibration limit switch, which operates on the principle of resonant frequency shift, also a method for limit level determination, a use, a program element and a medium. The vibration limit switch (100) comprises a vibration device (300) having a tuning fork (310) having at least one tine (315) and being excited by a vibration transmitter (320), the vibrations of which are received by a vibration receiver (330) , Furthermore, it has an impedance measuring device (400) with a non-electrically conductive path (410), which is arranged between two measuring points (420), and an impedance measuring probe (450), which is connected to the measuring points (420). Further, a correlation unit (500) for correlating the measurement signals from the vibration receiver (330) with the measurement signals from the impedance measurement probe (450). With this correlation unit (500), the coverage of the contents (120) and the state of the tuning fork (310) can be detected.