Brookfield CAP2000 Viscometer Manuel d'utilisateur télécharger pdf (Page 30)

Brookeld Engineering Labs., Inc. Page 30 Manual No. M02-313-G0812

Viscometer Related Variables

• Most uid viscosities are found to be non-Newtonian. They are dependent on shear rate and

the spindle geometry. The specications of the Viscometer cone and plate geometry will affect

the viscosity readings. For example, if one reading is taken at 750 rpm, and a second at 900

rpm, the two viscosity values may be different because the readings were made at different

shear rates. The faster the spindle speed, the higher the shear rate.

• The shear rate of a given measurement is determined by the rotational speed and the cone

angle.

• A repeatable viscosity test should control or specify the following:

1. Viscometer model

2. Cone Spindle used: Cone Angle and Cone Diameter

3. Test temperature

4. Cone Spindle speed [or the shear rate]

5. Length of time to rotate cone spindle before recording the viscosity reading

6. Sample volume sufcient to cover the face of the cone

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Brookfield CAP2000 Viscometer Manuel d'utilisateur Page 30