Brookfield KU-2 Viscometer - Manual (Page 11)

Brookfield Engineering Labs., Inc. Page 11 Manual No. M04-242-D0612
Appendix A - KU-2 Calibration Information
The accuracy of the KU-2 is verified using viscosity standard fluids calibrated in Krebs Units, which
are available from Brookfield Engineering Laboratories or your local Brookfield dealer/distributor/
representative. Note: Calibration should not be verified using the centipoise scale. The centipoise
scale is for reference use only and is based on a correlation from the Krebs Unit details in the ASTM
test method D562. Viscosity Standards are calibrated at 25°C. Available standards are listed in
Table A-1 below:
Table A-1
Brookfield Viscosity Standard Nominal Viscosity (KU) Temperature (°C)
KU61 61 25
KU73 73 25
KU87 87 25
KU99 99 25
KU106 106 25
Brookfield Viscosity Standards
We recommend that Brookfield Viscosity Standard Fluids be replaced on an annual basis, one year
from the date of initial use. These fluids can be stored under normal laboratory conditions. Disposal
should be in accordance with local, state and federal regulations. Material Safety Data Sheets are
available on our website: www.brookfieldengineering.com/support/documentation.
Calibration Check Procedure
The frequency of the calibration check should be based on your company's standard practice for test
and calibration of instruments.
1) Select any two viscosity standards listed in Table A-1 to perform your calibration check.
The viscosity standards are very temperature sensitive. The viscosity value of the fluid will
change with temperature so it is important to control the temperature to 25.0°C.
Note: Do not use viscosity standards calibrated in centipoise.
2) Pour the selected fluid into a standard US 1-pint can. The spindle and the fluid in the can
should come to temperature equilibrium before proceeding with the calibration check.
It is important that the fluid and the spindle come to 25.0°C, ± 0.1°C, before proceeding
with the calibration check.
3) Once the fluid and spindle have come to thermal equilibrium, place the sample container
on the viscometer base, using the KU1-74 adapter. Switch the power switch and printer (if
used) to "ON". Switch the Hold Reading Switch to the "UP" position. Turn the Select knob
to "KU".
4) Move the viscometer handle down to the lowest position. The spindle will begin rotating
once the handle is within 1/2 inch of the lowest position.