Brookfield DV-I Viscometer - Manual (Page 33)

Brookfield Engineering Laboratories, Inc. Page 33 Manual No. M/92-021-O604
Brookfield Viscosity Standard Fluid - General Information
We recommend that Brookfield Viscosity Standard Fluids be replaced on an annual basis, one year
from date of initial use. These fluids are either pure silicone or mineral oil 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;
MSDS information is available upon request.
Brookfield Engineering Laboratories does not recertify Viscosity Standard Fluids. We will issue dupli-
cate copies of the Certificate of Calibration for any fluid within two years of the purchase date.
Brookfield Viscosity Standard Fluids are reusable provided they are not contaminated. Normal prac-
tice 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, Thermosel or Spiral
Adapter, the fluid is normally discarded.
Calibration Procedure for LV(#1-4) and RV,HA,HB(#1-7) Brookfield spindles:
1) Place the viscosity standard fluid (in the proper container) into the water bath.
2) Lower the DV-I+ 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. 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 (m•Pas).
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 section entitled,
Interpretation of Calibration Test Results).