Brookfield DV-E Viscometer Manual de usuario descargar pdf (Pagina 5)

Brookeld Engineering Labs., Inc. Page 5 Manual No. M98-350-J0912

I. INTRODUCTION

The Brookeld DV-E Viscometer measures uid viscosity at given shear rates. Viscosity is a

measure of a uid’s resistance to ow. You will nd a detailed description of the mathematics

of viscosity in the Brookeld 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 Brookeld website,

www.brookeldengineering.com.

The principle of operation of the DV-E is to rotate a spindle (which is immersed in the test uid)

through a calibrated spring. The viscous drag of the uid against the spindle is measured by the

spring deection. Spring deection 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 Brookeld:

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

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 Brookeld Engineering or your local Brookeld agent

immediately. Any shipping damage must be reported to the carrier.

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Brookfield DV-E Viscometer Manual de usuario Pagina 5