The weight of the material subjected to drying, is the most reliable criteria for the
current moisture level. The best way to determine the status of the drying process is by
keeping track of this weight. For this purposes, the electronic scale EVL15 is connected
to the system. It allows to measure the mass of the material in real time and to store
data through specialized software (Figure 3). The module allows setting the
communication port of the computer, the speed of data transmitted on the serial
interface and the type of balance. By this module it is possible to choose the length of
the time interval between which the values gathered will be stored in a TXT file [8]. The
collected data are used to construct the kinetic curves for the drying of different
materials at given temperature and speed of the airflow in the chamber. Table 1 shows
a sample of the change of weight measured by the scale during the drying process.
Time interval between weights values used for this experiment was nearly 1min