Brookfield Dial Stepper Viscometer Manuel d'utilisateur télécharger pdf (Page 22)

E0608

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7) The viscosity reading should equal the cP value on the viscosity uid standard to within the

combined accuracies of the viscometer and the standard (as discussed in the section entitled,

Interpretation of Calibration Test Results). However, instrument accuracy is ±/- of the maximum

viscosity range and not the standard 1%.

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When verifying the calibration of the Viscometer, the instrument and viscosity standard uid error must

be combined to calculate the total allowable error.

The Dial Viscometer is accurate to ± 1% of any full scale spindle/speed viscosity range.

Brookeld Viscosity Standard Fluids are accurate to ± 1% of their stated value.

Example: Calculate the acceptable range of viscosity using RVT with RV-3 Spindle at 2 RPM;

Brookeld Standard Fluid 12,500 with a viscosity of 12,257 cP at 25°C:

1) Refer to the instructions on the FACTOR FINDER. Calculate the full scale viscosity range

by multiplying the spindle/speed FACTOR by 100.

Spindle RV-3, 2 RPM FACTOR = 500

Full scale viscosity range is 500 x 100 = 50,000 cP

The viscosity is accurate to ± 500 cP (which is 1% of 50,000)

Note: All spindle/speed factors found on the FACTOR FINDER are equivalent to 1% of

the spindle/speed full scale viscosity range.

2) The viscosity standard uid is 12,257 cP. Its accuracy is ± 1% of 12,257 or ± 122.57 cP.

3) Total allowable error is 122.57 + 500 cP = ± 622.57 cP.

4) Therefore, any viscosity reading between 11,634.4 and 12,879.6 cP indicates that the viscometer

is operating correctly. Any reading outside these limits may indicate a viscometer problem.

Contact the Brookeld technical sales department or your local Brookeld dealer/distributor

with test results to determine the nature of the problem.

Note: Excel Spreadsheet template is available on our website for analyzing calibration

results.

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Brookfield Dial Stepper Viscometer Manuel d'utilisateur Page 22