Apparatus for determining and/or monitoring at least one process variable of a medium
AssigneeEndress + Hauser GmbH + Co. KG
InventorThomas Blodt
Life of this patent
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Abstract
An apparatus for determining and/or monitoring at least one process variable of a medium in a container or pipeline, including a resonator, which is in contact with an interior of the container or the pipeline, an active element for producing a high-frequency signal in the resonator and an electronics unit, which is embodied to receive from a unit formed of the resonator and the active element an electrical output signal. The electrical output signal is evaluated with reference to frequency.
Claims9
An apparatus for determining and/or monitoring a limit level or a dielectric constant of a medium in a container or pipeline, comprising:
- a resonator, which is in contact with the medium;
- an active element for producing a high-frequency signal in said resonator;
- and
- an electronics unit, which is embodied to receive from a unit formed of said resonator and said active element an electrical output signal, and to evaluate the output signal with reference to frequency,
- characterized in that the electronics unit is embodied to determine the frequency of the output signal and to figure from the frequency, the dielectric constant of the medium, and/or
- the electronics unit is embodied to detect a change of the frequency of the output signal and based on the change to detect a change of the limit level of the medium,
- wherein said resonator at least sectionally bounds the interior of the container or pipeline via interpositioning of an electrically insulating, process isolating layer.
Dependencies are inferred from the claim text.