Your Brookfield Viscometer/Rheometer is guaranteed to be accurate to +/- 1.0% of the full-scale range in use. You can check the accuracy of your Viscometer by performing a calibration check.
Calibration checks for Viscometers/Rheometers using standard spindles:
You must use:
- 600 ml beaker; do not entrap air in the standard (Brookfield high viscosity standards should be measured in the jar for standard spindles)
- Controlled temperature 25.0°C (+/- .01°C); standard, spindle and guard leg need to equilibrate. Confirm temperature with a certified temperature probe
- Guard leg in place for LV and RV spindles
- Fluid that has been initially opened within the past 12 months
- Accuracy for the calibration check is: Instrument Accuracy is 1% of Full-Scale Range (FSR) of the method and is added to Standard Fluid Accuracy, which is 1% of the certified fluid value in cP.
Calculating accuracy for the Instrument:
FSR is the product of the spindle factor and speed in use, multiplied by 100; if you have a spindle and speed entered, the FSR will also be displayed at the top of either selection screen for 2T/3T/Next or within the “Range” box for DVPlus; the screen displays a viscosity value in cP equal to the viscosity at 100% torque, 1% of that displayed FSR is instrument accuracy.
Determining Accuracy for the Standard Fluid:
The certified fluid value is on the jar's label, above the word "value", and is stated in cP(mPa·s). Calculate 1% of this value.