Brookeld Engineering Labs., Inc. Page 29 Manual No. M02-313E1209
Viscometer Related Variables
• Most uid viscosities are found to be non-Newtonian. They are dependent on Shear Rate and
the spindle geometry conditions. The specications of the Viscometer cone and plate geom-
etry 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 produced 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 used
3. Test temperature
4. Test speed [or the shear rate]
5. Length of time to record viscosity
6. Sample volume sufcient to cover the face of the cone
- Warranty Repair and Service
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