Viscometer

Details Viscometer Viscometer

1984-11-28

1986-12-09

Levy, Stewart J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

73 54, G01N 1112

Patent

active

046272720

ABSTRACT:
A viscometer (10) employs a tube (12) with a check valve (30) at one end and a ferromagnetic bobbin (16) disposed inside and freely movable with respect to it. A pair of coils (38 and 40) are alternately energized, causing the bobbin (16) to move against fluid in the tube in one direction, in which the check valve (30) prevents fluid flow, and in the other direction, in which the check valve (30) permits fluid flow within the tube. When the bobbin (16) moves in the direction in which the check valve (30) permits flow, it draws a new sample of fluid into the tube, and the time required for the bobbin (16) to move in the other direction, in which fluid flow is prevented by the check valve (30), is measured as an indication of the viscosity of the fluid. The position of the bobbin is sensed by measuring the mutual inductance between the coils (38 and 40). Preferably, the bobbin (16) is of neutral buoyancy so that operation of the viscometer is substantially insensitive to vibration and to orientation with respect to gravity.

REFERENCES:
patent: 1790948 (1931-02-01), Rodgers
patent: 2957338 (1960-12-01), Kennedy et al.
patent: 3073150 (1963-01-01), Fann
patent: 3073151 (1963-01-01), Fann

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