Brookfield DV-E Viscometer - Manual (Page 5)

Brookfield Engineering Labs., Inc. Page 5 Manual No. M98-350-J0912
I. INTRODUCTION
I. INTRODUCTION
The Brookfield DV-E Viscometer measures fluid viscosity at given shear rates. Viscosity is a
measure of a fluid’s resistance to flow. You will find a detailed description of the mathematics
of viscosity in the Brookfield publication “More Solutions to Sticky Problems”, a copy of which
was included with your DV-E and can be downloaded in pdf form from the Brookfield website,
www.brookfieldengineering.com.
The principle of operation of the DV-E
is to rotate a spindle (which is immersed in the test fluid)
through a calibrated spring. The viscous drag of the fluid against the spindle is measured by the
spring deflection. Spring deflection is measured with a rotary transducer which provides a torque
signal. The measurement range of a DV-E
(in centipoise or milliPascal seconds) is determined
by the rotational speed of the spindle, the size and shape of the spindle, the container in which the
spindle is rotating, and the full scale torque of the calibrated spring.
There are four basic spring torque series offered by Brookfield:
Spring Torque
Model dyne-cm milli Newton-m
LVDV-E 673.7 0.0673
RVDV-E 7,187.0 0.7187
HADV-E 14,374.0 1.4374
HBDV-E 57,496.0 5.7496
The higher the spring torque, the higher the measurement range. The viscosity measurement range
for each spring torque may be found in Appendix A.
All units of measurement are displayed according to either the CGS (cP) system or the SI
(mPa•s) system.
1. Viscosity appears in units of centipoise (shown as “cP”) or milliPascal-seconds (shown
as “mPa•s”) on the DV-E display.
2. Torque appears in units of dyne-centimeters or Newton-meters (shown as percent “%”
in both cases) on the DV-E display.
The equivalent units of measurement in the SI system are calculated using the following conversions:
SI CGS
Viscosity: 1 mPa•s = 1 cP
Torque: 1 Newton-m = 10 7 dyne-cm
References to viscosity throughout this manual are made in CGS units. The DV-E Viscometer
provides equivalent information in SI units (see Section II.4 AUTORANGE).
I.1 Components
Please check to be sure that you have received all components, and that there is no damage. If
you are missing any parts, please notify Brookfield Engineering or your local Brookfield agent
immediately. Any shipping damage must be reported to the carrier.