Brookfield DV2T Viscometer - Manual (Page 76)

Brookfield Engineering Labs., Inc. Page 76 Manual No. M13-167-B0614
When a UL or DIN UL Adapter is used, the water bath is stabilized at the proper temperature:
1) Put the proper amount of viscosity standard fluid into the UL Tube (refer to the
UL Adapter instruction manual).
2) Attach the spindle (with extension link and coupling nut) onto the DV2T.
3) Attach the tube to the mounting channel.
4) Lower the tube into the water bath reservoir, or if using the ULA-40Y water jacket,
connect the inlet/outlets to the bath external circulating pump.
5) Allow 30 minutes for the viscosity standard, sample chamber and spindle to
reach test temperature.
6) Measure the viscosity and record the Viscometer reading. Note: The spindle must
rotate at least five (5) times before readings are taken.
Calibration Procedure using a Helipath Stand and T-Bar Spindles
When a Helipath Stand and T-Bar spindles are used:
1) Remove the T-bar spindle and select a standard LV (#1-3) or RV, HA, HB (#1-6)
spindle. Follow the procedures for LV (#1-3) and RV, HA, HB (#1-6) Brookfield
spindles outlined above.
2) T-Bar spindles should not be used for verifying calibration of the DV2T
Viscometer.
Calibration Procedure for Spiral Adapter
Brookfield recommends a two step check. First, verify the calibration of the viscometer
using the standard viscometer spindles (LV #1-3, RV #2-6, HA #2-6 and HB #2-6 or
cone/plate spindles) as detailed in this appendix. Second, verify the calibration of the
viscometer using the Spiral Adapter. The use of an accessory device may increase the
accuracy of measurement associated with the DV2T.
1) Place the viscosity standard fluid (in the proper container) into the water bath
(refer to the Spiral Adapter instruction manual).
2) Attach the spindle to the viscometer. Attach chamber (SA-1Y) and clamp to the
viscometer.
3) Lower the DV2T into measurement position. Operate the viscometer at 50 or
60 RPM until the chamber is fully flooded.
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 (operate at 50 or
60 RPM 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 viscometer reading. Note: The spindle
must rotate at least five (5) times for one minute, whichever is greater 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 section entitled, Interpretation of Calibration Test Results).