Brookfield DV-E Viscometer - Manual (Page 26)

Brookfield Engineering Labs., Inc. Page 26 Manual No. M98-350-J0912
air bubbles beneath the disk by first immersing the spindle at an angle, and then connecting
it to the viscometer.
4) The viscosity standard fluid, together with the spindle and guard leg (if supplied), 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.
Fluid must be within ± 0.1°C of the specified temperature, normally 25°C. Allow longer
soak time if required to come to test temperature.
6) If the fluid is at test temperature, measure the viscosity and record the viscometer reading.
Note: The spindle must rotate at least five (5) times before readings are taken.
7) The viscosity reading should equal to the cP value on the viscosity fluid standard to within
the combined accuracies of the viscometer and the standard (as discussed in Interpretation
of Calibration Test Results
at the end of this Appendix).
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-E.
4) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test
temperature.
5) Measure the viscosity and record the viscometer reading.
Note: The spindle must rotate at least five (5) times before a viscosity reading is taken.
Calibration Procedure for a Thermosel System
A two-step process is recommended for the Thermosel.
A) Evaluate the calibration of the Viscometer alone according to the procedure outlined in
this
section, entitled Calibration Procedure for LV #1-3 (#61-63) and RV, HA, HB #2-6
Brookfield spindles.
B) Evaluate the Viscometer with the Thermosel according to the procedure described below.