Brookfield DV-III Rheometer - Manual (Page 44)

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for usage in a 600 ml beaker is to return the material from the beaker back into the bottle. When using
smaller volumes in accessories such as Small Sample Adapter, UL Adapter or Thermosel, the fluid is
normally discarded.
Calibration Procedure for LV(#1-4) and RV,HA,HB(#1-7) Brookfield spindles:
1) Place the viscosity standard fluid (in the proper container) into the water bath.
2) Lower the DV-III into measurement position (with guard leg if LV or RV series Rheometer is
used).
3) Attach the spindle to the Rheometer. If you are using a disk shaped spindle, avoid trapping air
bubbles beneath the disk by first immersing the spindle at an angle, and then connecting it to the
Rheometer.
4) The viscosity standard fluid, together with the spindle, should be immersed in the bath for a
minimum of 1 hour, stirring the fluid periodically, prior to taking measurements.
5) After 1 hour, check the temperature of the viscosity standard fluid with an accurate thermometer.
6) If the fluid is at test temperature ( + /- 0.1
°
C of the specified temperature, normally 25
°
C),
measure the viscosity and record the Rheometer reading.
Note: The spindle must rotate at least five (5) times before readings are taken.
7) The viscosity reading should equal the cP value on the viscosity fluid standard to within the
combined accuracies of the Rheometer and the standard (as discussed in the section entitled,
Interpretation of Calibration Test Results).
Calibration Procedure for a Small Sample Adapter
When a Small Sample Adapter is used, the water jacket is connected to the water bath and the water
is stabilized at the proper temperature:
1) Put the proper amount of viscosity standard fluid into the sample chamber. The amount varies
with each spindle/chamber combination. (Refer to the Small Sample Adapter instruction
manual.)
2) Place the sample chamber into the water jacket.
3) Put the spindle into the test fluid and attach the extension link, coupling nut and free hanging
spindle (or directly attach the solid shaft spindle) to the DV-III.
4) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test
temperature.
5) Measure the viscosity and record the Rheometer reading.
Note: The spindle must rotate at least five (5) times before a viscosity reading is taken.
Calibration Procedure for a Thermosel System
When a Thermosel System is used, the controller stabilizes the Thermo Container at the test
temperature. A two-step process is recommended for the Thermosel: