Patent ID: 8763443

Claim:
A method for operating a density measuring device having a measuring tube for determining the density of a medium, comprising the steps of: filling a measuring tube with a medium, inciting the measuring tube to vibrate, determining the frequency of the vibration and other parameters which determine the physical-geometrical properties of the measuring tube, calculating the density of the medium from the determined frequency at least partially compensating for the influence of other parameters on the calculated density of the medium, wherein said other parameters comprise at least one of the pressure in the medium and at least one physical-geometrical property of the measuring tube, said at least one physical-geometrical property including at least one mechanical stress of the measuring tube, wherein the mechanical stress of the measuring tube is measured only in a non-deflected state of the measuring tube by synchronizing measurement of the mechanical stress with the frequency of the vibration determined, and wherein the influence of the mechanical stress on the calculated density is compensated using only the mechanical stress determined during the non-deflected state of the measuring tube.