80
13.4
How the automatic nozzle selection works (SELETRON system)
In a traditional system, the farming machine speed limits depend on the minimum and maximum pressure of the nozzle in use and on the desired
spray rate.
For instance, if we were spraying 100 l/ha with a violet evenfan nozzle ISO110025, the minimum operating speed shall be 6.9 km/h (corresponding
to a pressure of 1 bar) while maximum speed shall be 13.9 Km/h (corresponding to a pressure of 4 bars).
This operation field can be restrictive for the features of both crop to be treated and machine.
Operation field of possible combinations of ISO11002 and ISO110025 nozzles
When automatic nozzle selection is enabled, Delta 80 (using Seletron devices) will enable the nozzle, or combination of nozzles, according to the
set spray rate and driving speed.
This system allows to widen the machine operating range, i.e. in the above instance, using ISO11002 yellow (
A
) and ISO110025 violet (
B
) nozzles,
that work correctly at a speed from 5.5 km/h to 24.9 km/h.
Nozzle A
Nozzle B
Fig. 258
Speed (km/h)
Fig. 259
According to the set data and those detected by the sensors, Delta 80 will select the suitable nozzle configuration, constantly checking that:
- spraying pressure remains within the range selected for each single nozzle at all times
- if more than one nozzle configuration is possible, the configuration where working pressure is as close as possible to the working range of the
nozzle is selected
- nozzle replacement is significantly reduced
When setting a treatment, make sure to couple compatible nozzles.
For example:
• Compatible nozzles
: the rate at 1 bar of the ISO025 nozzle is LOWER than the rate at 5 bars of the ISO02 nozzle (Fig. 260).
• NON compatible nozzles:
the rate at 1 bar of the ISO05 nozzle is HIGHER than the rate at 5 bars of the ISO02 nozzle (Fig. 261).
OK
Fig. 260
NO
Fig. 261
In the same way, the overall rate of both nozzles at MINIMUM pressure shall be LOWER than the rate of the high rate nozzle at MAXIMUM pressure.
When setting the treatment (par. 12.5) Delta 80 automatically checks the rates and in case the above conditions are not
respected, the computer will display the message
Wrong nozzles configuration!
"AUTOMATIC FUNCTIONS" - MANUAL / AUTOMATIC NOZZLE SELECTION
