Brookfield YR-1 Rheometer Manual do Utilizador descarregar pdf (Página 49)

Brookeld Engineering Labs., Inc. Page 49 Manual No. M02-215-B0412

Pressing the Enter key toggles between the spindle and speed elds.

Note: The spindle must rotate at least ve (5) times before readings are taken.

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

combined accuracies of the Rheometer and the viscosity standard uid as discussed in the

following section (Interpretation of Calibration Test Results).

13) When the calibration check is complete, switch off the rheometer or press the ESC key if

you wish to Print Parameter RAM (see Appendix H – Fault Diagnosis and Troubleshoot-

ing).

Interpretation of Calibration Test Results:

When verifying the calibration of the YR-1 Rheometer, the instrument and viscosity standard

uid error must be combined to calculate the total allowable error.

The YR-1 is accurate to ±2% of any full scale spindle/speed viscosity range for vane spin-

dles.

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

Example: Calculate the acceptable range of viscosity using the RVYR-1 Rheometer and

V-71spindleat2RPM;BrookeldStandardFluid12,500withaviscosityof

12,257 cP at 25 °C:

1) Calculate full scale viscosity range using the equation:

Full Scale Viscosity Range [cP] = TK * SMC *

10,000

RPM

where:

TK = 1.0 from Table A-2

SMC = 2.62 from Table A-1

Full Scale Viscosity Range

1 * 2.62 * 10,000

= 13,100 cP

The viscosity is accurate to ±262 cP (which is 2% of 13,100)

2) The viscosity standard uid is 12,257 cP. Its accuracy is ±1% of 12,257 or ±123 cP.

3) Total allowable error is 262 + 123 cP = ±385 cP.

4) Therefore, any viscosity reading between 11,872 and 12,642 cP indicates that the YR-1

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

Contact the Brookeld technical sales department or your local Brookeld dealer with test

results to determine the nature of the problem.

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Brookfield YR-1 Rheometer Manual do Utilizador Página 49