Procedure and apparatus for detecting viscosity change of a medi

Details Procedure and apparatus for detecting viscosity change of a medi Procedure and apparatus for detecting viscosity change of a medi

1994-11-09

1996-07-09

Jenkins, Robert W.

Agitating

With test, signal, or indicator means

366274, B01F 1308

Patent

active

055338003

ABSTRACT:
A magnetic stirrer (1) with a magnet (3) driven in a rotating fashion by an electric motor (2) for the activation of a stirring bar magnet (7) inside a container (5) filled with a medium (6) has a digitally operated regulator (8), implemented with software, that is a software regulator. With this regulator, the rotational drive speed of the motor (2) can be held constant. At the same time, the change in the regulated quantity of this regulator (8) is detected and, in the event of a change in load, is reported to or displayed for the user as a trend or tendency of the viscosity change of the medium (6). In this way, the regulation of a constant rotational motor speed can be used at the same time for detecting changes in viscosity of the stirred medium (6).

REFERENCES:
patent: 4390283 (1983-06-01), Meyer
patent: 4876069 (1989-10-01), Jochimsen
Derwent Publications Ltd., Section El, Week 9207, Gorki Univ. Phys. Tec., SU-398594, (1991).
Derwent Publications Ltd., Section Ch, Week 8831, Gakken KK, AN 88-216145, (1988).

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