Brookfield DV-E Viscometer - Manual (Page 29)

Brookfield Engineering Labs., Inc. Page 29 Manual No. M98-350-J0912
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 C-2
(in Appendix C)
SMC
= 10 from
Table C-1
(in Appendix C)
Full Scale Viscosity Range =
1 * 10 * 10,000 = 50,000 cP
2
The viscosity is accurate to ( + /-) 500
cP
(which is 1% of 50,000)
2) The viscosity standard fluid 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 Brookfield technical sales department or your local Brookfield dealer/
distributor with test results to determine the nature of the problem.
EXAMPLE 2
: Calculate the acceptable range of viscosity using RVDV-E with Small Sample
Adapter at 10RPM; Brookfield Standard Fluid 12,500 with a viscosity of 12,257
cP
at 25°C:
1) Determine full scale range by pressing the “AUTORANGE” key on your instrument, The
display shows 25,000cP. The viscosity is accurate to +/- 500 cP (which is 2% of 25,000
cP).
2) The viscosity standard fluid 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 Brookfield technical sales department or your local Brookfield dealer/
distributor with test results to determine the nature of the problem.