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 ana-
lyzer, the fully automatic 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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