16
While preparing substances for measure-
ment, no processes may be used that
generate heat. The heat generated may
result in a loss of moisture prior to the
measurement.
Perform initial analysis of a new substance
to test how the IR rays are absorbed by the
sample and converted into heat. A printout
of the intermediate values of the drying
process provides information on this at an
early stage.
Since introducing IR rays produces intensive
energy input in the sample, the temperature
setting selected for infrared drying is usually
lower than the temperature setting used
when working with a drying oven.
In many cases, the fully automatic switch-
off mode will meet your requirements. If the
final result is higher or lower than expected,
try varying the temperature setting before
resorting to a different switch-off criterion.
When analyzing the samples that lose their
moisture only very slowly or when operating
a cold moisture analyzer, the fully auto-
matic mode may end the drying routine too
early since no analyzable progress in the
drying routine can be detected. In this case,
preheat the moisture analyzer for two to
three minutes before starting the drying
routine, or select a different switch-off
criterion.
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