APPARATUS FOR DETERMINING OR MONITORING THE FILL LEVEL OF A MEDIUM IN A CONTAINER
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for determining or monitoring the fill level or a predetermined limit level of a medium in a container, comprising a self excited system comprising an oscillation producing unit for producing electromagnetic waves within a predetermined frequency band; at least one sensor having an electrode, wherein the sensor is arranged at a predetermined angle to the longitudinal axis of the container, wherein the electrode is supplied with the electromagnetic waves, wherein the at least one sensor is arranged relative to the medium in such a manner that the phase of the electromagnetic waves reflected at the interface of the medium changes under the influence of the medium; and a feedback loop, which feeds the electromagnetic waves back to the at least one sensor, whereby the frequency of the self excited system is determined, a frequency detector, which registers the frequency of the electromagnetic waves, and an evaluation unit, which based on the registered frequency ascertains the relative dielectric constant and/or the permeability of the medium dependent on the respective fill level and based on the ascertained relative dielectric constant or the permeability of the medium determines the fill level or the reaching of the predetermined limit level of the medium in the container.
31 Citations
22 Claims
-
1-11. -11. (canceled)
-
12. The apparatus for determining or monitoring fill level or a predetermined limit level of a medium in a container, comprising:
-
a self excited system, comprising; an oscillation producing unit for producing electromagnetic waves within a predetermined frequency band; at least one sensor having an electrode, said at least one sensor is arranged at a predetermined angle to the longitudinal axis of the container, said electrode is supplied with the electromagnetic waves, and said at least one sensor is arranged relative to the medium in such a manner that the phase of the electromagnetic waves reflected at the interface of the medium changes under the influence of the medium; a feedback loop, which feeds the electromagnetic waves back to said at least one sensor, whereby the frequency of the self excited system is determined; a frequency detector, which registers the frequency of the electromagnetic waves; and an evaluation unit, which based on the registered frequency ascertains the relative dielectric constant and/or the permeability of the medium dependent on the respective fill level and based on the ascertained relative dielectric constant or the permeability of the medium determines the fill level or the reaching of the predetermined limit level of the medium in the container. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification