Abstract: The present disclosure includes a method for monitoring the condition of a component of an electromechanical resonator having a piezoelectrical element which can be excited to mechanical vibration using an electrical excitation signal and the mechanical vibrations of which can be received in the form of an incoming electrical signal. The method steps performed at a first point and a second point in time, including determining an amplification factor of the electromechanical resonator, determining a mechanical quality resonator, and establishing an electromechanical efficiency resonator at least from the amplification factor and the mechanical quality. A change over time in the electromechanical efficiency is calculated from the first point to the second point in time, the change over time in the electromechanical efficiency is compared with a pre-definable threshold, and a condition indicator is determined from the comparison.

Abstract: The present invention relates to an apparatus (1) for determining and/or monitoring at least one process variable of a medium (2) in a containment (3), comprising a first oscillatory element (11a) and a second oscillatory element (11b), a first driving/receiving unit (12a) and a second driving/receiving unit (12b), and an electronics (6), wherein the first driving/receiving unit (12a) is embodied to excite the first oscillatory element (11a) by means of a first electrical excitation signal (UE1) to execute mechanical oscillations, and to receive the mechanical oscillations of the first oscillatory element (11a) and to convert such into a first electrical, received signal (UR1), wherein the second driving/receiving unit (12b) is embodied to excite the second oscillatory element (11b) by means of a second electrical excitation signal (UE2) to execute mechanical oscillations, and to receive the mechanical oscillations of the second oscillatory element (11b) and to convert such into a second electrical, received

Abstract: The present disclosure relates to a method for determining at least one process variable of a medium, including steps of recording a sensor signal from a field device and determining a selected model from a set of at least two different models by means of a classifier. Each of the models is used for determining the process variable based at least on the sensor signal. The classifier is designed to select the selected model. The method also includes a step of determining the process variable based at least on the selected model and the sensor signal.

Abstract: The present disclosure relates to a method for determining at least one process variable of a medium. The method includes steps of recording a first value for the process variable by means of a first method for determining the process variable and recording a second value for the process variable by means of a second method for determining the process variable. The method also includes steps of selecting at least one of the detected values for the process variable by means of a classifier and outputting the selected value for the process variable. The present disclosure further relates to a computer program designed for executing a method according to the present disclosure, and to a computer program product having a computer program according to the present disclosure.

Abstract: Vibronic sensor and method of operation for monitoring the density and/or the viscosity of a medium in a container, comprising a mechanically oscillatable unit, a driving/receiving unit and an electronics unit, wherein the driving/receiving unit is embodied, using an electrical exciter signal, to excite the mechanically oscillatable unit to execute mechanical oscillations, and to receive the mechanical oscillations and to convert them into an electrical, received signal, wherein the electronics unit is embodied to produce the exciter signal such that a predeterminable phase shift is present between the exciter signal and received signal, wherein the electronics unit is embodied to set a first predeterminable phase shift and a second predeterminable phase shift, and to ascertain a first frequency and a second frequency corresponding to the predeterminable phase shifts, and to determine from the two frequencies the density and/or the viscosity of the medium using a first and/or second analytical formula.

Abstract: The invention relates to a compensation device for the compensation of a phase shift caused a component of an electronic system unit of a vibronic sensor. The compensation device includes a bridging unit for the electrical bridging of at least the electromechanical converter; a signal generator for generating a test excitation signal; a phase detection unit for determining the phase shift between the test excitation signal and a test receive signal that passes through the bridging unit and the component of the electronic system unit; and a computer unit which determines a phase compensation instruction from the first phase shift.

Abstract: The present invention relates to a vibronic sensor for determining a process variable of a medium in a containment, comprising a mechanically oscillatable unit, a driving/receiving unit and an electronics unit having an adaptive filter. The present invention relates also to a method for operating the sensor. The electronics unit is embodied alternately to execute a first operating mode and a second operating mode. The driving/receiving unit is embodied during the first operating mode to excite the oscillatable unit using an electrical excitation signal. During the second operating mode, the exciting of the oscillatable unit is interrupted and the oscillations of the oscillatable unit are received and transduced into an electrical, received signal. At least one filter characteristic of the adaptive filter is set such that a predeterminable phase shift is present between the excitation signal and the received signal, and the process variable is determined from the received signal.

Abstract: A vibronic sensor for determining and/or monitoring at least one process variable of a medium in a container. The sensor at least comprising: a unit which can oscillate mechanically; a driving/receiving unit; and an electronic unit. The driving/receiving unit is designed to excite, by an electrical excitation signal, mechanical oscillations in the unit which can oscillate mechanically and is designed to receive the mechanical oscillations of the unit which can oscillate mechanically, and to convert the mechanical oscillations into an electrical receiving signal. The electronic unit is designed to generate the excitation signal on the basis of the receiving signal and to determine that at least one process variable from the receiving unit. The electronic unit comprises at least one adaptive filter; and the electronic unit is designed to set the filter characteristic of the adaptive filter in such a way that there is a target phase shift between the excitation signal and the receiving signal.

Abstract: A method to determine and/or monitor at least one process variable of a medium with at least one vibration-capable unit. The vibration-capable unit is excited to mechanical vibrations by means of an electrical excitation signal of an adjustable frequency; wherein the mechanical vibrations are transduced into a received electrical signal, which is characterized at least by a frequency and/or a phase and/or an amplitude. The excitation signal is generated based on the received signal; wherein the voltage values of the received signal are sampled at specified predetermined points in time, starting from the excitation signal. The real part and the imaginary part of the received signal are determined from the sampled voltage values of the received signal by means of a Goertzel algorithm; wherein at least one Goertzel coefficient—in particular the number of the sample values and/or an operating frequency and/or a sample frequency—is provided for performing the Goertzel algorithm.

Abstract: The present disclosure includes a method for monitoring the condition of a component of an electromechanical resonator having a piezoelectrical element which can be excited to mechanical vibration using an electrical excitation signal and the mechanical vibrations of which can be received in the form of an incoming electrical signal. The method steps performed at a first point and a second point in time, including determining an amplification factor of the electromechanical resonator, determining a mechanical quality resonator, and establishing an electromechanical efficiency resonator at least from the amplification factor and the mechanical quality. A change over time in the electromechanical efficiency is calculated from the first point to the second point in time, the change over time in the electromechanical efficiency is compared with a pre-definable threshold, and a condition indicator is determined from the comparison.

Abstract: The present disclosure relates to a method and corresponding sensor for determining density and/or viscosity of a medium using a vibronic sensor. An oscillatable unit is excited using an electrical excitation signal to execute mechanical oscillations, and the mechanical oscillations of the mechanically oscillatable unit are received and transduced into an electrical, received signal. The excitation signal is produced based on the received signal such that at least one predeterminable phase shift is present between the excitation signal and the received signal, wherein a frequency of the excitation signal is determined from the received signal at the predeterminable phase shift. A damping and/or a variable dependent on the damping are/is determined from the received signal at the predeterminable phase shift. From the damping and/or the variable dependent on the damping and from the frequency of the excitation signal, the density and/or the viscosity of the medium are/is ascertained.

Abstract: The present disclosure relates to a measuring device for measuring a dielectric constant of fill substances in containers. The measuring device includes: a transmitting circuit for transmitting a first electromagnetic high-frequency signal and a second electromagnetic high-frequency signal; a receiving circuit for receiving the two high-frequency signals; and an evaluation circuit to ascertain a first phase shift between the transmitting and the receiving of the first high-frequency signal, to ascertain a second phase shift between the transmitting and the receiving of the second high-frequency signal, and to ascertain an amplitude of one of the received high-frequency signals. Based on these three values, the dielectric constant is determined. By determining phase shift at different frequencies, it is possible according to the present disclosure, especially in the case of solid-type fill substances, to determine their dielectric constant uncorrupted, thus without influence of air inclusions or moisture.

Abstract: An apparatus and a method for determining and/or monitoring at least one process variable of a medium in a container, comprising: a mechanically oscillatable unit, a driving/receiving unit for exciting the mechanically oscillatable unit to execute mechanical oscillations by means of an electrical exciting signal and for receiving and transducing mechanical oscillations into an electrical, received signal, an electronics unit, which electronics unit is embodied, to produce the exciting signal starting from the received signal, to set a predeterminable phase shift (??) between the exciting signal and the received signal, and from the received signal, to determine and/or to monitor the at least one process variable.

Abstract: A method for calibration or adjustment of any oscillatable unit with a mathematical model describing the oscillatable unit, wherein the oscillatable unit interacts with a medium located in a container, comprising the steps as follows: exciting the oscillatable unit via a real input signal to execute oscillations; the real output signal of the oscillatable unit is ascertained; the real output signal is digitized and a real output sequence is produced; the real input signal is digitized and a digital input sequence is produced; the digital input sequence is fed to a function block, which provides the mathematical model of the oscillatable unit in interaction with the medium. The mathematical model is defined by at least two sensor-specific variables; a virtual output sequence is produced via the mathematical model.

Abstract: An apparatus for determining and/or monitoring at least one process variable of a medium in a container, comprising: a mechanically oscillatable unit; an electrodynamic transducer unit for exciting the oscillatable unit by means of an exciter signal to execute mechanical oscillations and for receiving the mechanical oscillations of the oscillatable unit and transducing them into an electrical, received signal; and an electronics unit, which at least determines and/or monitors the process variable based on the received signal. The invention is distinguished by features including that the electrodynamic transducer unit has exactly one coil, which serves both as a drive element as well as also a receiving element.

Abstract: A method for determining and or monitoring at least one process- and/or system specific parameter in automation technology. An oscillatable system is provided, which interacts with a medium located in a container, wherein the oscillatable system is excited to oscillate via a real input signal, wherein the real output signal of the oscillatable system is ascertained, wherein the real output signal is digitized and a real output sequence yu(k) is produced. The real input signal is digitized and a digital input sequence (u(k)) is produced, wherein the digital input sequence (u(k)) is fed to a function block (model), which provides at least one mathematical model of the oscillatable system in interaction with the medium. The mathematical model is defined by a number of process- and/or system specific parameters, wherein via the mathematical model a virtual output sequence (ym(k)) is produced, wherein the virtual output sequence ym(k) is compared with the real output sequence yu(k).

Abstract: Vibronic sensor and method of operation for monitoring the density and/or the viscosity of a medium in a container, comprising a mechanically oscillatable unit, a driving/receiving unit and an electronics unit, wherein the driving/receiving unit is embodied, using an electrical exciter signal, to excite the mechanically oscillatable unit to execute mechanical oscillations, and to receive the mechanical oscillations and to convert them into an electrical, received signal, wherein the electronics unit is embodied to produce the exciter signal such that a predeterminable phase shift is present between the exciter signal and received signal, wherein the electronics unit is embodied to set a first predeterminable phase shift and a second predeterminable phase shift, and to ascertain a first frequency and a second frequency corresponding to the predeterminable phase shifts, and to determine from the two frequencies the density and/or the viscosity of the medium using a first and/or second analytical formula.

Abstract: A vibronic sensor for determining and/or monitoring at least one process variable of a medium in a container. The sensor at least comprising: a unit which can oscillate mechanically; a driving/receiving unit; and an electronic unit. The driving/receiving unit is designed to excite, by means of an electrical excitation signal, mechanical oscillations in the unit which can oscillate mechanically and is designed to receive the mechanical oscillations of the unit which can oscillate mechanically, and to convert them into an electrical receiving signal. The electronic unit is designed to generate the excitation signal on the basis of the receiving signal and to determine the at least one process variable from the receiving signal; The electronic unit comprises at least one adaptive filter; and the electronic unit is designed to set the filter characteristic of the adaptive filter in such a way that there is a target phase shift between the excitation signal and the receiving signal.

Abstract: A vibronic measuring device for determining at least one process variable of a medium. Included are: an oscillatable unit; a transmitting/receiving unit, which, by means of a transmission signal, excites the oscillatable unit to execute mechanical oscillations and receives the mechanical oscillations and converts such into an analog, electrical, received signal; and a control/evaluation unit (MC), which receives the analog, received signal, digitizes such and determines the process variable therefrom and which produces the transmission signal.

Abstract: A method for determining and or monitoring at least one process- and/or system specific parameter in automation technology. An oscillatable system is provided, which interacts with a medium located in a container, wherein the oscillatable system is excited to oscillate via a real input signal, wherein the real output signal of the oscillatable system is ascertained, wherein the real output signal is digitized and a real output sequence yu(k) is produced. The real input signal is digitized and a digital input sequence (u(k)) is produced, wherein the digital input sequence (u(k)) is fed to a function block (model), which provides at least one mathematical model of the oscillatable system in interaction with the medium. The mathematical model is defined by a number of process- and/or system specific parameters, wherein via the mathematical model a virtual output sequence (ym(k)) is produced, wherein the virtual output sequence ym(k) is compared with the real output sequence yu(k).