Brookfield CAP2000 Viscometer - Manual (Page 25)

Brookfield Engineering Labs., Inc. Page 25 Manual No. M02-313-G0812
Note: The calibration process may be cancelled at any time prior to pressing RUN by press-
ing the ESCAPE key.
When calibration is complete, spindle rotation will stop and the “CALIBRATION COMPLETE”
screen is displayed. (See Figure III-2). Press ENTER to continue.
CALIBRATION COMPLETE
PRESS ENTER TO CONTINUE
If the viscometer is connected to a printer, the display will show “Press Print or Press Enter to
continue”. Press the PRINT key and the printout (Figure III-3) will automatically be generated.
There will be values for the listed variables. The operator can enter the information by hand
on the bottom of the printout.
CONE (00) CALIBRATION
VISCOSITY
(POISE)
FSR
(%)
TEMP
(Deg C)
S.STRESS
D/CM 2 )
S.RATE
(1/sec)
SPEED
(RPM)
TIMER
(SEC)
CONE
No.
SAMPLE
No.
Operator: ________________________________________________
Date: ____________________________________________________
Model/Serial #: ____________________________________________
Fluid: ____________________________________________________
Figure III-3
III.5 Repeatability
The CAP 2000+ Viscometer is repeatable to ±0.5% of the full scale viscosity range (FSR). Due
to shear heating considerations which occur in high shear rate instrumentation, the measurement
of NIST Viscosity Standard Fluids at rotational speeds above 900 RPM will show a decrease
in viscosity with an increase in rotational speed (shear rate).
Normal forces due to the shearing of a viscoelastic fluid (such as paint) are accounted for in
the CAP Series Viscometers by weight on the spindle column of 3.4 Newtons (340,000 Dynes)
total force. This is done to avoid having the cone lift off the plate, thereby changing the cone
plate geometry and producing incorrect viscosity readings. For normal forces greater than
3.4 Newtons (340,000 Dynes) total force, additional externally mounted weights are required.
However, more weight means more wear on the cone and plate. Additional weights should
only be considered when definitely required and removed when not required.
Contact Brookfield Engineering Laboratories or your Brookfield Dealer/Distributor/Representa-
tive for details on the above information.