Method for estimating viscosity

Details Method for estimating viscosity Method for estimating viscosity

G - Physics

01

N

G01N 11/00 (2006.01) G01N 1/14 (2006.01) G01N 35/10 (2006.01)

Patent

CA 2737209

A method for estimating the viscosity of a liquid in an aspirating or dispensing probe, includes: measuring a reference pressure which is the pressure inside a metering tip when no dispense or aspirate is occurring (P ref); dispensing or aspirating a liquid having a volume of air between the liquid and the pumping mechanism of the probe; stopping the aspirate or dispense; measuring the pressure (P stop) inside the tip at a time (t) which is the time when the aspirate or dispense is stopped; measuring the pressure ( P stop') inside the tip at a time (t') after t; and estimating viscosity as a function of P ref, P stop, and P stop'. In a preferred embodiment, the method is carried out on a diagnostic analyzer.

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