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Brookfield KU-1 Viscometer User Manual

Page 10

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Appendix A - KU-1 and KU-1Q Calibration

Each KU-1 or KU-1Q Viscometer is supplied with a Certificate of Calibration. The viscometers are
certified traceable to NIST calibration fluids which are available from Brookfield. The following fluids
are recommended for use in performing a calibration check.

NIST Viscosity Standard

Viscosity (KU)

T (

°

C)

KU64

64

25

KU79

79

25

KU84

84

25

KU95

95

25

KU115

115

25

Select two of the above fluids to run a calibration test on your KU-1 or KU-1Q viscometer. Method
of test is similar to the procedure outlined in Section II, Operation. The frequency of calibration
should be based on your company’s standard operating procedure for test and calibration of
instruments. Be careful to control temperature as close to 25

°

C as possible. The Viscosity

Standards are very temperature sensitive.

The full scale measurement range for both the KU-1 and KU-1Q viscometer is 140 Krebs units
(KU). The viscometer is guaranteed to be accurate within

±

2.0% of 140 KU or 2.8 KU. The

calibration fluid is guaranteed to be accurate within

±

1.0% of the viscosity value stated on the label.

In the case of KU64, this would be .64KU. Therefore, any measurement using this particular NIST
calibration fluid should provide a viscosity reading within

±

3.44 KU (2.8 KU + .64 KU = 3.44 KU

or 4 KU if you round up) of the fluid's viscosity stated on the label.

Appendix B - References

The KU-1 and KU-1Q Viscometer arecompatible with:

ASTM D 562

Standard Test Method for CONSISTENCY OF PAINTS USING THE
STORMER VISCOMETER