Drying of a small amount of seed does not always get the attention it deserves. The tray dryer of Agratechniek dries the seed in every tray automatically to the desired moisture content. This can vary per tray. The drying process starts automatically when the tray is placed and the mesh lid (b) is closed.
Cross section of the static tray dryer (in this example containing 6 trays; more or less trays is possible):
B: Tray placed and mesh lid closed
C: Measurement of T° and RH of the air from the seed
D: Slide for automatic opening and closing
E: Electrical heating for additional heating up
F: Central fan for air measurement
G: Heating radiator for desired basic T°
H: Valve register for inside air (recirculation)
I: Valve register for aspiration of outside air
J: Valve register for supply of dried air
The electric heating (g) ensures a separate temperature can be provided per tray or per drying phase. After the desired time or desired moisture content, the T° can be readjusted in a next phase.
The drying process usually stops when the air from the seed has reached the desired moisture content. Therefore the air from the seed will be measured (c). Another possibility is to end the drying process when a desired amount of moisture around the seed has been evaporated. The drying process will stop when the original weight of the seed has been reached.