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•
Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
•
Measure the viscosity and record the Viscometer reading.
•
Note: The spindle must rotate at least five (5) times before readings are taken.
•
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). However, instrument accuracy is ±2% of the maximum viscosity range and not
the standard 1%.
CALIBRATION PROCEDURE FOR A THERMOSEL SYSTEM
AMETEK 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) as detailed in this Appendix. Second verify the
calibration of the Viscometer using the Thermosel. The use of an accessory device may increase the accuracy of
measurement associated with the DVPlus.
When a Thermosel System is used, the controller stabilizes the Thermo Container at the test temperature.
•
Put the proper amount of HT viscosity standard fluid into the HT-2 sample chamber. The amount varies
with the spindle used (refer to the Thermosel instruction manual).
•
Place the sample chamber into the Thermo Container.
•
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 DVPlus.
•
Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
•
Measure the viscosity and record the Viscometer reading.
•
Note: The spindle must rotate at least five (5) times before readings are taken.
•
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). However, instrument accuracy is ±2% of the maximum viscosity range and not
the standard 1%.
CALIBRATION PROCEDURE USING UL OR DIN ADAPTERS
AMETEK 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) as detailed in this Appendix. Second, verify
the calibration of the Viscometer using the UL or DIN Adapters. The use of an accessory device may increase the
accuracy of measurement associated with the DVPlus.
When a UL or DIN Adapter is used, the water bath is stabilized at the proper temperature:
•
Put the proper amount of viscosity standard fluid into the UL Tube (refer to the UL Adapter instruction
manual).
•
Attach the spindle (with extension link and coupling nut) onto the DVPlus.
•
Attach the tube to the mounting channel.
•
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.
•
Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
•
Measure the viscosity and record the Viscometer reading.
•
Note: The spindle must rotate at least five (5) times before readings are taken.
•
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). However, instrument accuracy is ±2% of the maximum viscosity range and not
the standard 1%.
M21-400 REV.1.1
D V P L U S D I G I TA L V I S C O M E T E R - O P E R AT I O N A L M A N U A L
63
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