Method for operating a coriolis measurement device

A method for operating a Coriolis measurement device for measuring a density and/or a mass flow of a medium flowing through a pipeline, the method comprising:

• providing the Coriolis measurement device, including:
• a measuring tube for guiding the medium, the measuring tube having an inlet, an outlet, and a measuring tube wall enclosing a measuring tube lumen;
• an exciter for generating measuring tube vibrations;
• a first sensor on the inlet side and a second sensor on the outlet side for sensing measuring tube vibrations, wherein the exciter and the sensors each has a coil device with a coil and a magnetic device with a magnet, and wherein the coil device and the magnetic device of each sensor are moved relative to one another by measuring tube vibrations during which a measured electrical voltage is induced in the respective coil;
• and
• an electronic measuring/operating circuit for operating the exciter, for sensing and evaluating the measured electrical voltages from the sensors, and for outputting measured values of density and/or mass flow and diagnostic information;
• recording the measured voltages from the sensors and creating an asymmetric sequence of values using amplitudes of the measured voltages for the purpose of diagnosing the Coriolis measurement device;
• checking whether the asymmetric sequence of values satisfies at least one invalidity criterion;
• and
• creating a stabilized asymmetric sequence of values on the basis of the asymmetric sequence of values by replacing asymmetric measured values with substitute values,
• wherein, as an invalidity criterion is satisfied, a last valid measured value of the asymmetric sequence of values is used as the current value of the stabilized asymmetric sequence of values, or the stabilized asymmetric sequence of values is set to a predetermined value,
• wherein the first invalidity criterion is based on a scattering parameter of the asymmetric sequence of values exceeding a first limit value.