Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1995-06-07
1999-11-09
Brock, Michael
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
G01N 1108
Patent
active
059792299
ABSTRACT:
A process for determining the viscosity of liquids on a microliter scale, wherein first the difference (a) in the pressure drop in a reference liquid flowing in a constant volume flow through a capillary measuring tube is determined with and without a sample loop inserted in the capillary measuring tube passage, the sample loop is filled with the liquid to be measured outside the capillary measuring tube passage, the sample loop is reinserted into the capillary measuring tube passage and the pressure drop is measured immediately following the insertion of the sample loop in the capillary measuring tube passage. The difference (b) in the pressure drop immediately following insertion of the sample loop and the pressure drop across the capillary measuring tube without the sample loop can then be calculated. The ratio of b to a is the relative viscosity of the liquid to be measured, from which, if the viscosity of the reference liquid is known, the absolute viscosity of the liquid to be measured can be calculated. A further object of the invention is a device for executing this process.
REFERENCES:
patent: 4793174 (1988-12-01), Yau
patent: 4876882 (1989-10-01), Yau
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