Invention Grant
- Patent Title: Method for signaling a standard frequency of a density meter which has at least one vibratable measurement tube for conducting a medium
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Application No.: US16765549Application Date: 2018-10-30
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Publication No.: US11543337B2Publication Date: 2023-01-03
- Inventor: Alfred Rieder
- Applicant: Endress+Hauser Flowtec AG
- Applicant Address: CH Reinach
- Assignee: Endress+Hauser Flowtec AG
- Current Assignee: Endress+Hauser Flowtec AG
- Current Assignee Address: CH Reinach
- Agency: Endress+Hauser (USA) Holding, Inc.
- Agent Christopher R. Powers
- Priority: DE102017127266.6 20171120
- International Application: PCT/EP2018/079634 WO 20181030
- International Announcement: WO2019/096576 WO 20190523
- Main IPC: G01N9/00
- IPC: G01N9/00 ; G01F1/84

Abstract:
The method of the present disclosure for signaling a standard frequency of a density meter comprises: exciting bending vibrations of a measurement tube at an excitation mode working frequency, the working frequency depending on the density of a medium conducted in the measurement tube and on a disturbance variable; determining a characteristic value of the working frequency; determining a value representing the disturbance variable; calculating a corrected density value of the medium as a function of the characteristic value of the working frequency and of the value representing the disturbance variable; calculating a characteristic value of the standard frequency as a function of the corrected density value, the standard frequency being the frequency which produces the corrected density value in a calculation of the density using a frequency-dependent standard function which is not dependent on the disturbance variable; and providing a signal representing the standard frequency.
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