Patent ID: 11920972
Assignee: ENDRESS+HAUSER SE+CO. KG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. A device for determining and/or monitoring at least one process variable of a medium in a container, comprising:
at least one coil,
wherein the device is embodied to perform a method, including:
supplying the coil with an alternating electrical excitation signal and varying a frequency of the excitation signal from a starting frequency to an ending frequency;
receiving an electrical received signal from the coil during the varying of the frequency of the excitation signal;
measuring a phase shift between the excitation signal and the received signal;
ascertaining a first frequency for the excitation signal such that a first phase shift between the excitation signal and the received signal at the first frequency is less than a predeterminable limit value;
comparing an actual value for the first frequency with a desired value for the first frequency;
ascertaining a state indicator for the coil based on a deviation of the actual value of the first frequency from the desired value of the first frequency; and

ascertaining information regarding an extent of damage in the at least one coil based on the deviation between the actual value of the first frequency and the desired value of the first frequency.