21
Making Viscosity Measurements
NOTES:
1. Lock the cone tightly into the adapter.
2. When measuring volatile samples such as paints and coatings, and
when using either a high temperature CAP 1000+H or CAP 2000+H,
the solvent trap must be put in place over the cone to prevent the test
sample from drying out during the rotation of the cone.
e) Set the temperature control (Section II.5).
2. Set the cone number.
3. Lower the handle placing the cone onto the plate. Lock the handle into its lowest
position. Drop the solvent trap over the cone.
NOTE:
Allow ten (10) minutes for the cone to come to equilibrium temperature with
the plate.
4. Raise the handle. Place the sample to be measured onto the plate below the
cone and solvent trap. Refer to
Appendix A
for recommended sample sizes.
Lower the cone and solvent trap.
NOTES:
1. Lower the handle
gently
.
DO NOT FORCE THE CONE ONTO THE PLATE.
2. The sample must completely cover the face of the cone and extend
beyond the edge of the cone about 1.0 mm
(see table A-1 for sample size).
3. Release the solvent trap placing it onto the plate over the cone so it
does not touch the cone shaft.
The user should ensure that the substances placed under test do not
release poisonous, toxic or flammable gases at the temperatures to which
they are subjected during the testing.
5. Allow the cone, plate and sample to equilibrate to the temperature control setting.
NOTE:
A minimum of one (1) to three (3) minutes equilibrium time is recommended,
depending upon the sample.
6. Set the
Run Time
for rotating the cone (Section II.6) and the
Hold Time
.
7. Put the printer on-line (optional, Section II.7).
8. Press the
RUN
key and execute the viscosity measurement.
NOTE:
Due to the dynamics of shearing a fluid in the CAP “H” series Viscometers,
the temperature display may indicate a deflection from the equilibrium
temperature setting as the cone begins rotating at high shear rates. The
temperature display may indicate the temperature of the plate and the
momentary changes show the cycling of the temperature control at high
temperature. The precision of the viscosity measurement is maintained
within the limits specified in Table 3.1.
Summary of Contents for CAP 1000+
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