Brookfield YR-1 Rheometer Manual do Utilizador descarregar pdf (Página 36)

Brookeld Engineering Labs., Inc. Page 36 Manual No. M02-215-B0412

III.6 Test Results

III.6.1 Test Passed

When a yield test runs successfully, the resultant Yield Stress (Pa), the % Torque value at the

time of the yield and the Temperature at yield are printed.

Test (#5: Sample Tst) Complete

Yield Stress (Pa) = 726.36 % Torque @ Yield = 73.56 Temperature = 25.5C

In addition, the results are shown on the display as follows:

%=73.56 025.5C

YIELD-726.36 Pa

Figure III-21

III.6.2 Test Failed

Some of the reasons a yield test may fail are as follows.

III.6.2.1 Under-Range Condition

Only yield measurements in the % Torque range from 10% to 100% will be accepted. If

a Yield Stress is reached before the % Torque value is 10%, an Under-Range error causes

the test to end.

The following is sent to an attached printer:

Test (#5: Sample Tst) Complete

Test Failed = Under-range

The following screen is displayed:

YIELD ERROR

UNDER-RANGE

Figure III-22

III.6.2.2 Under-Range Error

The yield stress (Torque Reduction Value) is reached before the absolute % torque reaches

10%. When a test is started, once the absolute torque is greater than zero (0), the second,

third, and fourth Delta Torques (also known as the Base Increment Torque) are averaged.

The rst three (3) Delta Torques after 9% absolute torque is reached are also averaged. An

under-range error occurs if the second average falls below the rst average by 15% or more.

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Brookfield YR-1 Rheometer Manual do Utilizador Página 36