US 12,215,993 B2
Method for determining a density measurement value or a measurement value of a density-dependent measurand, and Coriolis mass flowmeter for performing the method
Hao Zhu, Freising (DE)
Assigned to Endress+Hauser Flowtec AG, Reinach (CH)
Appl. No. 17/999,473
Filed by Endress+Hauser Flowtec AG, Reinach (CH)
PCT Filed Apr. 23, 2021, PCT No. PCT/EP2021/060717
§ 371(c)(1), (2) Date Nov. 21, 2022,
PCT Pub. No. WO2021/233644, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 10 2020 113 762.1 (DE), filed on May 20, 2020.
Prior Publication US 2023/0280195 A1, Sep. 7, 2023
Int. Cl. G01F 1/84 (2006.01); G01F 15/02 (2006.01); G01N 9/00 (2006.01)
CPC G01F 1/8454 (2013.01) [G01F 1/8431 (2013.01); G01F 1/8436 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for determining a measurement value of at least one measurand, which is selected from a group of measurands, which comprises an effective density measurement value ρeff and a density-dependent measurand of a flowing medium, using a Coriolis mass flowmeter having two oscillators, each of which has two measuring tubes, wherein the measuring tubes of the two oscillators oscillate, in each case, pairwise oppositely to one another, wherein the four measuring tubes are arranged for parallel flow and are brought together inlet-side as well as outlet-side in separate manifolds, wherein the method comprises method steps as follows:
registering a first mass flow rate portion measurement value m1 of a first flow portion through the measuring tubes of the first oscillator and a second mass flow rate portion measurement value m2 of a second flow portion through the measuring tubes of the second oscillator, wherein the sum of the two mass flow rate portion measurement values gives a mass flow rate total measurement value;
registering a first density portion measurement value ρ1 of the medium in the first flow portion and a second density portion measurement value ρ2 of the medium in the second flow portion; and
calculating the effective density measurement value ρeff as a function of the two density portion measurement values ρ1, ρ2 with weightings dependent on the mass flow rate portion measurement values m1, m2,
wherein different weighting functions are applied for ascertaining the weightings as a function of the mass flow rate portion measurement values.