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Viscosity tester and method with orbiting object

  • US 5,394,739 A
  • Filed: 06/06/1994
  • Issued: 03/07/1995
  • Est. Priority Date: 06/06/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring the viscosity of a fluid, said apparatus comprising:

  • a stationary receptacle for containing the fluid;

    a free standing magnetic object on surface a receptacle disposed in the fluid in the receptacle;

    magnet means for producing a magnetic field and imposing a magnetic force on said magnetic object and moving the object through said fluid at a speed and at a lag angle with respect to the magnetic field in a generally orbital pattern in said receptacle to produce at least one parameter corresponding to the viscosity of the fluid;

    control means for controlling at least one of magnetic force, lag angle and speed; and

    sensing means for sensing at least one of the magnetic force, lag angle and speed and for producing a signal corresponding to the viscosity of the fluid.

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