Rotational viscometer

Details Rotational viscometer Rotational viscometer

1980-06-23

1982-10-05

Gill, James J.

Measuring and testing

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

Cleaning or foaming ability

G01N 1114

Patent

active

043522874

ABSTRACT:
A microprocessor controlled rotating-cylinder viscometer for measuring the shear stress at a given shear rate of a fluid is disclosed. The fluid is contained between a rotatable outer cylinder and a rotatable inner cylinder. The inner cylinder rotates in response to the torque produced by rotation of the outer cylinder in the fluid. The amount of rotation of the inner cylinder is related to the shear stress of the fluid. A fast slewing accurate motor speed control is provided for maintaining rotation of the outer cylinder at the selected shear rates. An absolute value shaft encoder monitors the amount of rotation of the inner cylinder to obtain the shear stress readings. The steady state value of the shear stress is obtained by averaging a predetermined number of measurements taken over a sample interval to obtain a stress reading. Consecutive readings are compared until the difference between readings in less than .+-.1.degree., the current shear stress then taken on the steady state value.

REFERENCES:
patent: 2553844 (1951-05-01), Buchdahl et al.
patent: 2812656 (1957-11-01), Merrill
patent: 3602035 (1971-08-01), Spohn et al.
patent: 3875791 (1975-04-01), Fitzgerald et al.
patent: 3977234 (1976-08-01), Lynch et al.
patent: 4062225 (1977-12-01), Murphy, Jr. et al.
patent: 4241601 (1980-12-01), Pennington et al.
API Recommended Practice, Standard Procedure for Testing Drilling Fluids, Seventh Edition, Apr. 1978.

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