Brookfield Dial Stepper Viscometer - Manual (Page 21)

Brookfield Engineering Laboratories, Inc. Page 21 Manual No. M00-151-H0612
Calibration Procedure using UL or DIN Adapters
When a UL or DIN Adapter is used, a water bath should be 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 Viscometer.
3) Attach the tube to the mounting channel.
4) Lower the tube into the water bath reservoir, or if using the ULA-49EAY 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 a viscosity reading is taken.
7) The viscosity reading should equal the cP value on the viscosity standard fluid to within the
combined accuracies of the Viscometer and the viscosity standard (as discussed in the section
entitled, Interpretation of Calibration Test Results) which appears later in this section.
Calibration Procedure using a Helipath Stand and T-Bar Spindles
T-Bar spindles should not be used for verifying calibration of the Viscometer.
Calibration Procedure for Spiral Adapter
1) Place the viscosity standard fluid (in the proper container) into a water bath and stabilize at the
proper temperature.
2) Attach the spindle to the viscometer. Attach chamber (SA-1Y) and clamp to the viscometer.
3) Lower the viscometer 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 until fluid emerges out from the top of the chamber before
readings are taken.