Procedure for determining the quality of process and installation conditions of a vortex flowmeter in which a medium, which is at least single-phase, flows, wherein said vortex flowmeter features a bluff body projecting into the flowing medium and a vortex sensor, said procedure comprising: - The generation of Karman vortices in the flowing medium, at least in the area of the vortex sensor, by means of the bluff body, wherein the vortices are shed by the bluff body at a vortex shedding frequency that depends on a current flow velocity of the flowing medium; - The measurement of periodic pressure fluctuations, caused by the Karman vortices in the flowing medium, using the vortex sensor for the generation of a sensor signal that corresponds to the pressure fluctuations - The selection of a useful signal component, using a data processing unit, from the sensor signal, which has a frequency band containing the vortex shedding frequency; - The use of the useful signal component to determine at least one quality parameter, which represents an indicator for the installation conditions; -- wherein at least one fluctuation value of the useful signal component is determined over a time interval extending over several periods of pressure fluctuations of the flow, particularly a standard deviation of an amplitude curve of the useful signal component and/or a kurtosis (Ku) of the useful signal component, said value being utilized as a quality parameter -- and/or wherein at least one fluctuation value of the vortex shedding periods contained in the useful signal component is determined over a time interval, said fluctuation value being a relative standard deviation, a kurtosis or a skew, and is used as a quality parameter; - The comparison of the quality parameter with a predefined value range of the quality parameter; and - The transmission of an acoustic or optical message using a display unit connected to the data processing unit, and/or the outputting of an electrical signal via an output unit connected to the data processing unit, if at least one value of the quality parameter is within or outside the predefined value range. - The generation of Karman vortices in the flowing medium, at least in the area of the vortex sensor, by means of the bluff body, wherein the vortices are shed by the bluff body at a vortex shedding frequency that depends on a current flow velocity of the flowing medium; - The measurement of periodic pressure fluctuations, caused by the Karman vortices in the flowing medium, using the vortex sensor for the generation of a sensor signal that corresponds to the pressure fluctuations - The selection of a useful signal component, using a data processing unit, from the sensor signal, which has a frequency band containing the vortex shedding frequency; - The use of the useful signal component to determine at least one quality parameter, which represents an indicator for the installation conditions; -- wherein at least one fluctuation value of the useful signal component is determined over a time interval extending over several periods of pressure fluctuations of the flow, particularly a standard deviation of an amplitude curve of the useful signal component and/or a kurtosis (Ku) of the useful signal component, said value being utilized as a quality parameter -- and/or wherein at least one fluctuation value of the vortex shedding periods contained in the useful signal component is determined over a time interval, said fluctuation value being a relative standard deviation, a kurtosis or a skew, and is used as a quality parameter; -- wherein at least one fluctuation value of the useful signal component is determined over a time interval extending over several periods of pressure fluctuations of the flow, particularly a standard deviation of an amplitude curve of the useful signal component and/or a kurtosis (Ku) of the useful signal component, said value being utilized as a quality parameter -- and/or wherein at least one fluctuation value of the vortex shedding periods contained in the useful signal component is determined over a time interval, said fluctuation value being a relative standard deviation, a kurtosis or a skew, and is used as a quality parameter; - The comparison of the quality parameter with a predefined value range of the quality parameter; and - The transmission of an acoustic or optical message using a display unit connected to the data processing unit, and/or the outputting of an electrical signal via an output unit connected to the data processing unit, if at least one value of the quality parameter is within or outside the predefined value range.