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8.1.8 Linked Test Options
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to edit a program
LINKED TEST OPTIONS
Linking Test Programs enables multiple
adjoining programs to run sequentially as
one test, changing temperatures, ending
criteria, times, etc. between test
segments. This feature is only available
on the MAX
®
4000XL.
In some materials, such as gypsum powder, moisture occurs in more than one molecular
state, usually free water and one or two bound water states. By linking tests with different
parameters, all of the moisture can be released and measured in its various forms. Since
the instrument’s lid is not opened between tests, rehydration is prevented. As the test for
free moisture is completed, the next Test Program in the sequence is initiated. This
subsequent Test Program must contain the parameters for the bound water test. As this
test ends, the next Test Program is initiated and so on, up to 4 programs total. Tests that
utilize Syringe Tare cannot be linked together. Results from linked tests are displayed on
the MULTIPLE TEST VIEW screen, as shown here, using gypsum as an example.
For example, for gypsum:
•
Free water evaporates from the
sample at relatively low temperatures,
typically 40 °C to 80 °C.
•
Bound water however requires higher
temperatures, some around 135 °C
and others around 240 °C to break the
molecular bonds.
Linked Test Programs after the 1
st
program typically use custom result equations (See
section
on page
Sometimes a material may be dried prior to testing, and the material may actually gain
moisture during the test. ALLOW MOISTURE GAIN allows the instrument to report
negative results. In this case, a Rate ending criteria will end in 4 minutes if a peak loss
rate is not detected. The “Rate or Time” ending criteria can be used to end the test
sooner.
