Brookfield DV-I Prime - Manual (Page 5)

Brookfield Engineering Laboratories, Inc. Page 5 Manual No. M/07-022-D0613
I. INTRODUCTION
The Brookfield DV-I PRIME Viscometer measures fluid viscosity at given shear rate. Viscosity
is a measure of a fluid’s resistance to flow. You will find a detailed description of the science of
viscosity in the Brookfield publication “More Solutions to Sticky Problems”, a copy of which
was included with your DV-I PRIME.
The principle of operation of the DV-I PRIME is to drive 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. This system provides
continuous sensing and display of the measurement during the entire test. The measurement range
of a DV-I PRIME (in centipoise or milliPascal-seconds) is determined by the rotational speed
of the spindle, the size and shape of the spindle, the container the spindle is rotating in, 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-I PRIME 673.7 0.0673
RVDV-I PRIME 7,187.0 0.7187
HADV-I PRIME 14,374.0 1.4374
HBDV-I PRIME 57,496.0 5.7496
The higher the torque calibration, the higher the measurement range. The viscosity measurement
range for each torque calibration may be found in Appendix B.
Spring torque decals, on peel-off labels, are being supplied with your instrument. Please select
the appropriate decal and attach to the viscometer.
The DV-I PRIME is available with a built-in temperature probe option, which allows temperature
readout over the range -100ºC to +300ºC (-148ºF to + 572ºF). This option allows ambient
temperature measurement or temperature measurement of the sample during viscosity testing.
Contact Brookfield or your local Brookfield agent for more information on this instrument option.
All units of measurement are displayed according to either the CGS system or the SI system.
1. Viscosity appears in units of centipoise (shown as “cP”) or milliPascal-seconds (shown
as mPa•s) on the DV-I PRIME Viscometer display.
2. Torque appears in units of dyne-centimeters or Newton-meters (shown as percent “%”)
in both cases) on the DV-I PRIME Viscometer display.
Tp 3. Temperature appears in units of Celsius (shown as C) or Fahrenheit ( shown as F) on the
DV-I PRIME
Viscometer display.
The following applies to DV-I PRIME Viscometers with the temperature probe option. Look for
the symbol
Tp throughout this manual for instructions pertaining specifically to DV-I PRIME
Viscometers with temperature probe option.