Some samples contain more than one volatile material, for example, nylon resins with large amounts of unpolymerized material (Caprolactam). In these cases, the rate will fall to some fixed value when all the moisture is evaporated but while the monomer is still evaporating. The graphical display available from the Main Test Screen is of great help in visualizing these cases. The rate ending criteria, if set above the rate of monomer volatilization, may give the best results.
Time - This feature places a time limit on a test. The test will end when a selected amount of time has passed.
Fixed time tests are seldom superior to the prediction algorithm, but can be useful when conducting application characterization tests, or when investigating long term stability of the instrument.
Time or Rate – This feature is used during tests when a change in moisture may not occur. When the moisture characteristics of a sample are not known, linked tests, with slightly higher temperatures for each successive test may be used.
With the “Time or Rate” selection and linked tests enabled, testing will continue for the set amount of time and then start the next test in
sequence. If a moisture loss occurs, the test will end on the rate criteria and the next test will begin.
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