Brookfield Dial Viscometer - Manual (Page 26)

Brookfield Engineering Laboratories, Inc. Page 26 Manual No. M/85-150-P700
D2. Consult with Brookfield or an authorized dealer to determine which fluid is
appropriate.
TABLE D2
OIL VISCOSITY STANDARD FLUIDS
BEL Part No. Viscosity (cP) 25
°
C
B31 31
B210 210
B750 750
B1400 1,400
B2000 2,000
B11000 11,000
B20000 20,000
B80000 80,000
B200000 200,000
B420000 420,000
Interpretation of Calibration Test Results:
When verifying the calibration of the Viscometer, the instrument and viscosity standard fluid 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.
Brookfield Viscosity Standards Fluids are accurate to
±
1% of their stated value.
Example: Calculate the acceptable range of viscosity using RVF with RV-3 Spindle at 2 RPM;
Brookfield 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 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 viscom-
eter is operating correctly. Any reading outside these limits may indicate a viscometer problem.