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AMETEK Brookfield Viscosity Standard Fluid general information
We recommend that AMETEK Brookfield Viscosity Standard Fluids be replaced on an annual basis, one year from
date of initial use. These fluids are pure silicone and are not subject to change over time. However, exposure to
outside contaminants through normal use requires replacement on an annual basis. Contamination may occur by the
introduction of solvent, standard of different viscosity or other foreign material.
Viscosity Standard Fluids may be stored under normal laboratory conditions. Disposal should be in accordance with
state, local and federal regulations as specified on the material safety data sheet.
AMETEK Brookfield does not re-certify Viscosity Standard Fluids. We will issue duplicate copies of the Certificate
of Calibration for any fluid within two years of the purchase date. AMETEK Brookfield Viscosity Standard Fluids are
reusable provided they are not contaminated. Normal practice for usage in a 600 mL beaker is to return the material
from the beaker back into the bottle. When using smaller volumes in accessories such as Small Sample Adapter, UL
Adapter or Thermosel, the fluid is normally discarded.
CALIBRATION PROCEDURE FOR LV #1-3 (#61-63) AND RV, HA, HB #1-6 AMETEK Brookfield SPINDLES
Please Note That The LV#4(64) and RV, HV, HB#7 (07) Spindles have been omitted from this procedure. AMETEK
Brookfield does not recommend the use of these spindles to perform a calibration check in your instrument. Reasons
pertain to the small amount of spindle surface that conacts the viscosity standard, the difficulty of establishing the
immersion mark precisely and the need for precise temperature control at 25
spindle.
Follow these steps using one of the recommended spindles to verify calibration on your instrument:
•
Place the viscosity standard fluid (in the proper container) into the water bath.
•
Lower the DVNext into measurement position (with guard leg if LV or RV series Rheometer is used).
•
Attach the spindle to the Rheometer. 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 Rheometer.
•
The viscosity standard fluid, together with the spindle, should be immersed in the bath for a minimum of 1
hour, stirring the fluid periodically, prior to taking measurements.
•
After 1 hour, check the temperature of the viscosity standard fluid with an accurate thermometer.
•
If the fluid is at test temperature (±0.1°C of the specified temperature, normally 25°C), measure the
viscosity and record the Rheometer 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 fluid standard to within the combined accuracies
of the Rheometer and the viscosity standard (as discussed in the section, at the end of this Appendix,
entitled Interpretation of Calibration Test Results) which appears later in this section.
Calibration procedure for a Small Sample Adapter
AMETEK Brookfield recommends a two-step check. First, verify the calibration of the rheometer using the standard
rheometer 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 rheometer using the 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:
•
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).
•
Place the sample chamber into the water jacket.
•
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 DVNext.
•
Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
M19-2101 REVISION 2.0
D V N E X T R H E O M E T E R - O P E R AT I O N A L M A N U A L
C in the immediate vicinity of the
0
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