Abstract: Disclosed is an apparatus for determining a process variable of a medium in a containment, comprising first and second oscillatory elements, first and second driving/receiving units, and electronics. The first driving/receiving unit is embodied to excite the first oscillatory element using a first electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the first oscillatory element and to convert such into a first electrical, received signal, wherein the second driving/receiving unit is embodied to excite the second oscillatory element by means of a second electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the second oscillatory element and to convert such into a second electrical, received signal, and wherein the electronics is embodied to determine the process variable from the first received signal and/or the second received signal.

Abstract: Disclosed is an apparatus for determining a process variable of a medium in a containment, comprising first and second oscillatory elements, first and second driving/receiving units, and electronics. The first driving/receiving unit is embodied to excite the first oscillatory element using a first electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the first oscillatory element and to convert such into a first electrical, received signal, wherein the second driving/receiving unit is embodied to excite the second oscillatory element by means of a second electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the second oscillatory element and to convert such into a second electrical, received signal, and wherein the electronics is embodied to determine the process variable from the first received signal and/or the second received signal.

Abstract: The invention relates to a method for calibrating an analytical measuring device in a measuring point. The method includes closing the outlet valve so that no process medium is discharged, closing the inlet valve so that no additional process medium is fed into the measuring point and a volume of process medium is in the measuring point, feeding a predetermined volume of the calibration medium into the measuring point, circulating the calibration medium by means of the pump so that the flow circuit is generated and the calibration medium flows against the analytical measuring device, detecting a first measured for a calibration, repeating the steps of feeding the calibration medium into the measuring point, circulating the calibration medium, and detecting a measured value for the calibration, and evaluating the measured values and performing the calibration.

Abstract: The present disclosure relates to a method for calibrating an analytical measuring device in a measuring point, wherein the method comprises at least the following steps: closing the inlet valve so that no process medium is fed from the first inlet into the measuring point, emptying the measuring point of the process medium through the outlet valve, closing the outlet valve, feeding a predetermined volume of the calibration medium into the measuring point through the inlet valve from the second inlet, circulating the calibration medium through the pump so that the flow circuit is generated and the calibration medium flows against the analytical measuring device, wherein a predetermined flow velocity of the calibration medium is adjusted by the pump, and calibrating the analytical measuring device.