5.0 Unknow Viscosity Measurement
5.1
General principles
：
Use small spindles (B3, B4) and low speed to measure high viscosity sample.
Use big spindles (B1, B2) and high speed to measure low viscosity sample. During measure, viscosity is
correct ,when the torque value keeps in the range from 10% to 90%.
5.2
Estimate viscosity range of sample. It is common to choose spindle first and speed next. For
example, when the spindle number is “B1” with the speed of 100 rpm, the full range is 500 mPa.s. When
the speed turn to be 150 rpm, the full range becomes 333 mPa.s.
5.3
When the viscosity of sample can not be estimated, regard it as high viscosity sample. Choose the
spindle number from “B4” to “B1” and speed from low to high. It is common viscosity value that the
torque is in the range
from 10% to 90%. If not, should change speed and spindle. Don’t forget
choosing the spindle number ,after change the spindle.
6.0 Attention
6.1
Be careful to install and remove the spindle. Don’t use big force and curve the spindle.
6.2
Choosing new spindle number, after change the spindle. The changed spindle need to be cleaned
and dried at once and put back to the spindle stand. Don’t clean the spindle connecting with the
viscosity.
6.3
When new fluid is waited for measure, clean the spindle and sleeve. The old fluid left on spindle and
sleeve may cause measure inaccuracy.
6.4
Viscosity and the spindle is a group. Don’t mix with other viscosity and spindle.
6.5
Don’t remove or adjusting the viscosity and the other parts.
6.6
When instrument needs to be moved, fix the screw and put it into the package.
6.7
There is a lot of “Non Newtonian fluid” in suspension liquid, emulsion, high polymer and other high
viscosity liquid. Their viscosity changed with speed, time or some other reasons. So it is common that
the viscosity is different in the measure with different spindle, speed and time. It is not the instrument
inaccuracy. Make a rule of measure with spindle number, speed and measure time to measure them.
6.8
Before measure, check each spindle and sleeve. If they were etched or shape change, the viscosity
would be wrong. Please connect with us to get new spindle. If viscosity would be used in special
environment, 316L series stainless steel spindle could be choose. In addition, the spindle of other
special material can be ordered.
When spindle is fixed, be careful to lock it. Sleeve bottom and spindle must keep coaxial. When using
“B3” and “B4” spindle, sleeve can be removed. But spindle can be touch wall of container. This may
change the coaxial. If sleeve was not used, take a note in the result.
6.9
To get more accurate value:
•Control the temperature of fluid accurately;
•Keep spindle in the fluid for some time to make their temperature be same;
•Keep viscometer stability, place of spindle and fluid balance;
•Keep the spindle in the middle of fluid. Equip the sleeve;
•Keep spindle clean and balance ;
