Brookfield DV-III Ultra Rheometer - Manual (Page 114)

Brookfield Engineering Laboratories, Inc. Page 114 Manual No. M/98-211-B0104
Brookfield Engineering Laboratories, Inc. Page 114 Manual No. M98-211-E0912
APPENDIX E - Calibration Check Procedures
Brookfield’s accuracy statement for viscometers used with standard spindles is +/- 1% of full scale
range. When measuring viscosity with a specific spindle rotating at a defined speed, the maximum
viscosity that can be measured is defined as full scale range. For digital viscometers, this value is
easily determined by pressing the “AUTORANGE” key. The display will how the full scale range
viscosity in cP or mPa•s and the torque value will show “100%”. Multiply the full scale range vis-
cosity by 1% to determine the accuracy of any future measurement made with that spindle/speed
combination.
When using the following accessory devices with your viscometer, the accuracy is +/- 2%. Dimen-
sional tolerances in the accessory device allow for the increase from +/- 1% to +/-2%.
• Small Sample Adapter
• Thermosel
• Ul Adapter
• DIN Adapter
• Spiral Adapter
For more help you can go to the website,
www.brookfieldengineering.com, and download the video.
The accuracy of the DV-III Ultra is verified using viscosity standard fluids which are available from
Brookfield Engineering Laboratories or your local Brookfield agent. Viscosity standards are Newtonian,
and therefore, have the same viscosity regardless of spindle speed (or shear rate). Viscosity standards,
calibrated at 25
°
C, are shown in Table E-1.
Container size: For Viscosity Standards < 30,000 cP, use a 600 ml Low Form Griffin Beaker
having a working volume of 500 ml.
For Viscosity Standards ≥ 30,000 cP, use the fluid container.
Inside Diameter: 3.25" (8.25cm)
Height: 4.75" (12.1cm)
Note: Container may be larger, but may not be smaller.
Temperature: As stated on the fluid standard label: ( + /-) 0.1 ° C
Conditions: The DV-III Ultra should be set according to the operating instructions. The water
bath should be stabilized at test temperature. Rheometers with the letters “LV”
or “RV” in the model designation should have the guard leg attached.