Method and apparatus for measuring the viscosity of a medium

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity

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G01N 1116

Patent

active

048753629

ABSTRACT:
The invention relates to a method and apparatus for measuring the viscosity of a medium with the aid of a blade (2) pivotally suspended such as to oscillate between two side walls (3, 4) in a measuring zone. The blade (2) is caused to pivot intermittently, with constant forces from an electromagnetic system (9) and a plunger coil (20), in the medium between the two fixed side walls (3, 4) which have a chief plane preferably extending parallel to, and in the same direction as the chief plane of the blade (2). The medium, which is in at least one first intermediate space between one side surface of the blade (2) and the side wall (3;4) facing it, being urged away in the direction of movement of the blade (2) simultaneously as new medium is sucked into at least one second intermediate space between the other side surface of the blade (2) and the other side wall (3;4) opposite thereto, a sheer force occurring when the medium is urged out from, or sucked into the measuring zone, and time measurement takes place when the free end (6) of the blade (2) traverses the distance (A-B;B-A) between the end positions, said time being a function of the sheer force, which in its turn is a function of the viscosity of the medium.

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