| 摘要 |
Apparatus for determining and/or monitoring at least one process variable of a medium in a container, comprising: a mechanically oscillatable unit; an electromechanical transducer unit, which has at least one piezoelectric or inductive, transducer element, which excites the oscillatable unit by means of an exciter signal to execute mechanical oscillations and which receives oscillations from the oscillatable unit and converts them into an electrical, received signal; a reference element having a first component of electrically adjustable size, wherein the reference element is connected in parallel with the electromechanical transducer unit and supplied with the same exciter signal and produces a reference signal uninfluenced by the oscillations of the oscillatable unit, and an electronics unit, which extracts a wanted signal from the received signal and the reference signal and, based on the wanted signal, determines and/or monitors the process variable. According to the invention, the electromechanical transducer unit includes a second component of electrically adjustable size. |
