Brookfield KU-1 Viscometer - Manual (Page 8)

Brookfield Engineering Labs., Inc. Page 8 Manual No. M/97-241-B1101
Appendix A - KU-1+ Calibration Information
The accuracy of the KU-1+ is verified using viscosity standard fluids which are available from
Brookfield Engineering Laboratories or your local Brookfield dealer/distributor/representative.
Viscosity Standards are calibrated at 25
°
C. Available standards are listed in Table A1 below:
Table A1
Brookfield Viscosity Standard Nominal Viscosity (KU) Temperature (
°
C)
KU64 64 25
KU79 79 25
KU84 84 25
KU95 95 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 upon request.
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 A1 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.
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.
5) Wait five (5) seconds for the reading to stabilize. Switch the Hold Reading Switch to the
"DOWN" position. You will need to record measurements in KU and grams. These two
values work together to let you interpret the calibration results.