Device for monitoring a predetermined filling level of a measuring medium in a container
AssigneeEndress + Hauser GmbH + Co. KG
InventorsSascha D'Angelico, Alexander Mueller
Life of this patent
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Abstract
A vibration detector for determining and/or monitoring a predetermined fill level in a container. The detector includes an oscillatable unit, a driver/receiver unit and an evaluation unit. The vibration detector can, additionally, be used as a viscosity sensor or as a density sensor. For providing a multivariable sensor, a microprocessor is provided in the oscillation circuit formed of oscillatable unit and feedback electronics. The microprocessor corrects the phase of the feedback electronics over a predetermined frequency bandwidth in such a way that the sum of the phases of the feedback electronics and the microprocessor follows a predetermined function f(v).
Claims15
1-14. (canceled)
An apparatus for monitoring of a predetermined fill level and/or for determining the density or viscosity of a medium in a container, comprising:
- an oscillatable unit;
- a driver/receiver unit;
- feedback electronics;
- and
- an evaluation unit, wherein:
- said oscillatable unit is placed according to one of the following:
- at the height of the predetermined fill level, and such that it reaches to a defined immersion depth into the medium,
- said driver/receiver unit excites said oscillatable unit to oscillate with a predetermined oscillation frequency via said feedback electronics,
- said evaluation unit detects the reaching of the predetermined fill level on the basis of a frequency change and/or an amplitude change of the oscillation of said oscillatable unit,
- said evaluation unit determines the density or the viscosity of the medium on the basis of a change of the oscillation of the oscillatable unit, in said oscillation circuit, formed said oscillatable unit and said feedback electronics, a microprocessor is provided, which corrects the phase of said feedback electronics over a predetermined frequency bandwidth in such a manner that the sum of the phases of said feedback electronics and said microprocessor follows a predetermined function f(v).
Dependencies are inferred from the claim text.