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8. CHOICE PARAMETERS OF DRYING
Temperature of drying
Value depends on kind of material. Too low temperature makes
partial evaporation (sample isn’t dried completely). Too high temperature
makes deflagration substance (sample is overheated) or possibility to
appearance chemical reactions. Temperature of drying is given by factory
and trade rules. If there is no rules given temperature can be chosen
experimental.
Time of testing sample
This is range of time [given in seconds] between following
measurements of sample mass. On the basic of this criterion moisture
balance treats sample as dried. Too short time of testing sample makes
fihish of measurement too soon. Too long time of testing sample makes
oscillate around final result. Measurement is finished if 3 following results of
detecting moisture are the same. If time of testing sample is settled on 2s
drying is finished if result doesn’t change in 6 s time. If time of testing is
settled on 20s result has to be the same by 1 minute time to finish drying.
1 – correctly selected drying parameters
2 – too big sample mass or too low temperature of drying or too
short time of drying
3 – disturbances in the drying process or to long time of
sampling
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