Patent ID: 9739653
Date: 2017-08-22
CPC Classifications: G01F,G01N

Claim:
1. A method for measuring a volume flow or viscosity of a fluid, comprising: providing a flow sensor with at least three measurement chambers which are arranged one behind the other and are fluidically interconnected by a plurality of flow resistors, wherein at least two of the plurality of flow resistors have a different coefficient of pressure loss, wherein a pressure sensor is provided for each measurement chamber; providing a family of characteristics from a plurality of isobaric characteristics, wherein the isobaric characteristics represent volume flow and viscosity value pairs, which cause a certain differential pressure across the corresponding flow resistor; determining at least two differential pressures across the corresponding at least two of the plurality of flow resistors in that the pressures in the corresponding measurement chambers are measured by the pressure sensors; assigning the determined at least two differential pressures to the corresponding isobaric characteristic having the same differential pressure in the respective families of characteristics; determining the intersection of the assigned at least two isobaric characteristics; determining the associated volume flow or the associated viscosity from the determined intersection.