US 12,339,151 B2
Flow sensor and method of measuring a flow
Dejan Nikolic, Bad Soden (DE); and Alexander Heide, Eppstein (DE)
Assigned to FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH, Bad Homburg (DE)
Appl. No. 17/795,909
Filed by FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH, Bad Homburg (DE)
PCT Filed Jan. 28, 2021, PCT No. PCT/EP2021/052027
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/152039, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 10 2020 102 485.1 (DE), filed on Jan. 31, 2020.
Prior Publication US 2023/0084231 A1, Mar. 16, 2023
Int. Cl. G01F 15/02 (2006.01); A61M 1/16 (2006.01); A61M 1/36 (2006.01); G01F 1/58 (2006.01)
CPC G01F 15/02 (2013.01) [A61M 1/36224 (2022.05); G01F 1/588 (2013.01); A61M 1/1607 (2014.02); A61M 1/1609 (2014.02); A61M 1/3663 (2013.01); A61M 1/3669 (2013.01); A61M 2205/3317 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/3372 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A flow sensor for measuring a flow difference comprising:
at least two measurement chambers through which fluid is conductible;
at least one means for producing a magnetic field for charge separation in a fluid flowing through the at least two measurement chambers, the magnetic field for charge separation having magnetic field lines;
at least one means for measuring an electric potential in the fluid flowing through the at least two measurement chambers;
a temperature sensor for measuring the temperature of a fluid flowing through the at least two measurement chambers, the temperature sensor being configured to detect the temperature of the fluid in the flow sensor; and
an evaluation device, wherein
the at least two measurement chambers are arranged such that they are run through by the same magnetic field lines of the magnetic field for charge separation, and
the evaluation device is configured to determine respective flow measurement values of fluid flowing through the at least two measurement chambers, correct the respective flow measurement values based on the temperature of the fluid in the flow sensor, which is measured by the temperature sensor, and determine a differential flow measurement of the fluid flowing through the at least two measurement chambers by offsetting the corrected flow measurement values.