Brookfield DV1 User Manual

Brookeld Engineering Laboratories, Inc. Page 41 Manual No. M14-023
Viscometer Related Variables
Most uid viscosities are found to be non-Newtonian. ey are dependent on Shear Rate and the spindle
geometry conditions. e specications of the viscometer spindle and chamber geometry will aect the
viscosity readings. If one reading is taken at 2.5 rpm, and a second at 50 rpm, the two viscosity values
produced will be dierent because the readings were made at dierent shear rates. e faster the spindle
speed, the higher the shear rate.
e shear rate of a given measurement is determined by: the rotational speed of the spindle, the size
and shape of the spindle, the size and shape of the container used and therefore, the distance between
the container wall and the spindle surface.
A repeatable viscosity test should control or specify the following:
1) Test temperature
2) Sample container size (or spindle/chamber geometry)
3) Sample volume
4) Viscometer model
5) Spindle used numbered
6) Test speed or speeds (or the shear rate)
7) Length of time or number of spindle revolutions to record viscosity
8) Presence/absence of guard leg (LV or RV models)

Brookfield DV1 Specifications

General

Speed Range	0.3 to 100 rpm
Display	LCD
Number of Speeds	18
Power Supply	100-240 VAC, 50/60 Hz
Viscosity Range	1 to 2, 000, 000 cP
Temperature Measurement	Optional
Accuracy	±1% of full scale range
Repeatability	+/- 0.2%