Flow sensor
AssigneeReseaChem GmbH
InventorsStefan Berger, Simon Zumbrunnen, Philip Marmet, Philipp Haslebacher, Manfred Schär
Life of this patent
Estimating the term…
Abstract
Proposed is a flow sensor (10), in particular for single use, having at least three measurement chambers (11, 15, 19), which are arranged one behind the other and are interconnected in each case by a flow resistance. At least two of the flow resistances have a different coefficient of pressure loss. A pressure measuring means (12, 16, 20) is provided for each measurement chamber, which pressure measuring means (12, 16, 20) is suitable for measuring the pressure in the measurement chamber. An electromagnetically actuatable valve arrangement (50) can be connected downstream of the flow sensor.
Claims20
A flow sensor comprising 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, wherein the pressure sensor is suitable for measuring the pressure in the corresponding measurement chamber.
A method for measuring the 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 in each case 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 at the corresponding flow resistor;
- determining the differential pressures across the corresponding at least two flow resistors in that the pressures in the corresponding measurement chambers are measured by of 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.
Dependencies are inferred from the claim text.