Multivariable sensor for determining and/or monitoring fill level and density and/or viscosity of a liquid in a container

摘要

A multivariable sensor for determining and/or monitoring a predetermined fill level and density and/or viscosity of a liquid in a container. The sensor comprises a measuring tube provided in the container. The measuring tube has at least a first oscillatable segment and a second oscillatable segment, wherein the oscillatable segments have a cross sectional area deviating from a circularly round shape and at least one straight side, wherein on an inner wall of the oscillatable segments, driver/receiving units are placed, which cause the oscillatable segments to execute resonant oscillations. At least one control/evaluation unit is provided, which evaluates frequency and/or phase and/or amplitude of the oscillations and determines therefrom reaching of the predetermined fill level and density and/or viscosity of the liquid.

主权项

1. A multivariable sensor for determining or monitoring at least one predetermined fill level and density or viscosity of a liquid in a container, comprising:
a measuring tube provided in the container, said measuring tube has at least a first oscillatable segment and a second oscillatable segment, said oscillatable segments have a cross sectional area deviating from a circularly round shape and at least one straight side, wherein, on an inner wall of said oscillatable segments, driver/receiving units are placed, which cause the oscillatable segments to execute resonant oscillations; and at least one control/evaluation unit, which evaluates frequency or phase or amplitude of the oscillations, and determines therefrom reaching of a predetermined fill level and density or viscosity of the liquid; wherein said measuring tube has two oscillatable segments, which are spaced apart from one another by an intermediate segment, and which have a driver/receiving unit respectively, which causes said oscillatable segments to execute oscillations; and said measuring tube is matched in length and in position of said oscillatable segments to the container in such a manner that the first oscillatable segment detects a maximal fill level and the second oscillatable segment detects a minimum fill level.