Brookfield Thermosel - Manual (Page 10)

Brookfield Engineering Laboratories, Inc. Page 10 Manual No. M/94-204-I0612
I.5 General
The operator should become familiar with the alignment procedure so that the system can be safely
aligned and operated at elevated temperatures.
The system is designed to operate in the temperature range from 40°C (104°F) to a maximum of
300°C (572°F). Control of test sample temperature is possible in this range with accuracy as follows:
Temperature Range Temperature Accuracy
40°C to +150°C
+150°C to +300°C
±1.0°C
±2.0°C
NOTE: The lower limit of control is approximately 40°C (104°F). The upper limit of precise
control is 300°C (572°F). This is determined not by the controller-heat element
capabilities, but by design of the spindle, sample chamber, thermo-container, and
the proximity of the viscometer to the thermo-container.
USE OF ThE SySTEm AbOvE 300°C COUlD rESUlT IN DAmAgE TO
ThE ThErmO-CONTAINEr AND TO ThE vISCOmETEr.
The controller will bring the thermo-container to elevated set point temperature in approxi mately
30 minutes. However, lowering the temperature from the elevated set point can be quite time
consuming. Approximately four hours is required for the thermo-container to cool from 260°C
(500°F) to 37°C (100°F). Using the optional cooling plug (HT-26Y) this temperature reduction can
be accomplished in about 20 minutes. Familiarization with the temperature controller instructions
should be made at this time.
Refer to Appendix A for viscosity range data, spindle factors (for use with Dial Reading Viscometers),
and test volume sample size. This information is to be used when obtaining viscosity measurements.
I.6 Viscosity Measurements
Samples That Are Liquid At Ambient Temperature
With the instrumentation assembled and familiarization completed, the following steps are
recommended for taking viscosity measurements of samples which are liquid at ambient temperature:
1. Remove the insulating cap; unthread the coupling nut and remove the spindle.
2. Raise the viscometer to the highest level on the stand.
3. Remove the sample chamber (HT-2 or HT-2D) using the extracting tool (HT-59 or HT-116
respectively) and place it in the sample chamber holder (HT-54).
4. Using a syringe, graduated cylinder, or other suitable measuring device, pour into the sample
chamber the volume of liquid sample specified on the range table in Appendix A.