Brookfield DV-I Prime - Manual (Page 55)

Brookfield Engineering Laboratories, Inc. Page 55 Manual No. M/07-022-D0613
Appendix E - Calibration Check Procedures
For more help go to
www.brookfieldengineering.com and download the video.
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 show the Full Scale Range
viscosity in cP or mPa.s and the torque value will show 100%. Multiply the Full Scale Range viscosity
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%. Dimensional
tolerances in the accessory device allow for increase from +/-1% to +/-2%.
• Small Sample Adapter
• Thermosel
• UL Adapter
• DIN Adapter
• Spiral Adapter
The accuracy of the DV-I PRIME 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 (Silicone Oils) and Table E-2 (Mineral Oils).
Container size
: For Viscosity Standards < 30,000 cP, use a 600 mL Low Form Griffin Beaker
having a working volume of 500 mL.
Inside Diameter: 3.25”(8.25cm)
Height: 4.75”(12.1cm)
For Viscosity Standards
≥ 30,000 cP, use the fluid container.
Note
: Container may be larger, but may not be smaller.
Temperature
: As stated on the fluid standard label: ( + /-) 0.1
°
C
Conditions
: The DV-I PRIME should be set according to the operating instructions. The
water bath must be stabilized at test temperature. Viscometers with the letters
“LV” or “RV” in the model designation must have the guard leg attached,
see Appendix F for more information on the guard leg).
Normal 25ºC Standard Fluids
Viscosity (cP) Viscosity (cP)
High Temperature Standard Fluids
Three Viscosity/Temperatures**
5 5,000 HT-30,000
10 12,500 HT-60,000
50 30,000 HT-100,000
100 60,000
500 100,000 **25ºC, 93.3ºC, 149ºC
1,000 Refer to Brookfield catalog for more information
Table E-1