M21-400 REV.1.1 DVPLUS DIGITAL VISCOMETER - OPERATIONAL MANUAL
1. INTRODUCTION
The AMETEK Brookfield DV Viscometer series has provided exceptional value for viscometer users since its
introduction in 1981. AMETEK Brookfield has continued to develop and improve to maintain its position in the market
as the best value for QC applications. The DVPlus Viscometer continues in this tradition of innovation, quality, and
value. The incorporation of a 5-inch touch screen allowed for a new and improved user interface that preserves
single speed data collection methods, which makes using the DVPlus Viscometer easier than ever before.
The DVPlus Viscometer measures fluid viscosity which is a measure of a fluid’s resistance to flow. You will find a
detailed description of the science of viscosity in the AMETEK Brookfield publication “More Solutions to Sticky
Problems”.
The principle of operation of the DVPlus 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, which 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 DVPlus (in centiPoise, Poise, Pascal-seconds, 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 oered by AMETEK Brookfield:
Spring Torque
Model dyne•cm milliNewton•m
dyn•cm mN•m
DVPLUS LV 673.7 0.0673
DVPLUS RV 7,187.0 0.7187
DVPLUS HA 14,374.0 1.4374
DVPLUS HB 57,469.0 5.7469
The higher the torque calibration, the higher the measurement range. The viscosity measurement range for each torque
calibration may be found in Appendix A.
The DVPlus can be configured to accept an optional temperature probe, which allows temperature readout over the
range -100°C to +300°C (-148°F to + 572°F, +173K to +573K). This option allows ambient temperature measurement or
temperature measurement of the sample during viscosity testing. Contact AMETEK Brookfield or your local authorized
dealer for more information on this instrument option.
All units of measurement are displayed according to either the CGS system or the SI system.
• Viscosity appears in units of centiPoise (shown as “cP”) or milliPascal-seconds (shown as mPa•s) on the
DVPlus Viscometer display. (Pascal “P” or Pascal seconds “Pa•s”)
• Torque appears in units of dyne-centimeters (shown as dyne.cm), percent (shown as %), or milli Newton-
meters (Shown as mNm) on the DVPlus Viscometer display.
• Temperature appears in units of Celsius (shown as °C), Kelvin (shown as K), or Fahrenheit (shown as °F)
on the DVPlus Viscometer display.
The following applies to DVPlus Viscometers when using an optional temperature probe. Look for the symbol
throughout this manual for instructions pertaining specifically to DVPlus Viscometers with temperature probe option.
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