公开(公告)号：US20210164821A1

公开(公告)日：2021-06-03

申请号：US16770394

申请日：2018-11-13

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Bernd Josef Schäfer

IPC: G01F1/84

Abstract: Disclosed is a method for determining the viscosity of a medium using a Coriolis mass flow meter, comprising: exciting bending vibrations in the measuring tube in a symmetrical bending vibration use mode using an exciter arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a central vibration sensor also arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a vibration sensor on the inlet side and of a vibration sensor on the outlet side; determining a phase relation or time delay between the sensor signals of the central vibration sensor and a symmetrical function of the sensor signals on the inlet-side and outlet-side vibration sensors. Determining the viscosity of the medium as a function of said phase relation or time delay.

公开(公告)号：US11326919B2

公开(公告)日：2022-05-10

申请号：US16770394

申请日：2018-11-13

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Bernd Josef Schäfer

IPC: G01F1/84

Abstract: A method for determining the viscosity of a medium using a Coriolis mass flow meter comprises exciting bending vibrations in the measuring tube in a symmetrical bending vibration use mode using an exciter arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a central vibration sensor also arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a vibration sensor on the inlet side and of a vibration sensor on the outlet side; determining a phase relation or time delay between the sensor signals of the central vibration sensor and a symmetrical function of the sensor signals on the inlet-side and outlet-side vibration sensors; and determining the viscosity of the medium as a function of the phase relation or time delay.