Brookfield DV1 Viscometer - Manual (Page 49)

Brookfield Engineering Laboratories, Inc. Page 49 Manual No. M14-023
Follow theses steps using one of the recommended spindles to verify calibration of your instrument.
1) Place the viscosity standard fluid (in the proper container) into the water bath.
2) Lower the DV1 into measurement position (with guard leg if LV or RV series viscometer
is used).
3) Attach the spindle to the viscometer. 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 viscometer.
4) The viscosity standard fluid, together with the spindle and guardleg, should be immersed
in the bath for a minimum of 1 hour, stirring the fluid periodically, prior to taking
measurements.
Don’t introduce air bubbles.
The spindle can be rotated in the fluid to accelerate temperature equilibrium.
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;
include % and cP (mPa•s).
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 viscometer and the standard (as discussed in the end of
this section entitled, Interpretation of Calibration Test Results).
Calibration Check 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 DV1.
4) Allow sufficient time for the viscosity standard, sample chamber and spindle to reach test
temperature.
5) Measure the viscosity and record the viscometer reading; include % and cP (mPa•s).
NOTE: The spindle must rotate at least five (5) times before readings are taken.