35
11.1
How does the SELEJET system work
In a traditional system, the farming machine speed depends on the minimum and maximum pressure of nozzle in use and on 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
Coupled with a specific pneumatic control unit and the relevant nozzle holders (refer to ARAG general catalogue), Bravo 400 in Selejet mode auto-
matically selects the nozzle or the suitable combination of two different nozzles (
a
and
B
) for the speed and required spray rate.
This system allows for widening 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.
a
B
Fig. 82
Fig. 83
According to the set data and those detected by the sensors, Bravo 400 select the suitable nozzle configuration constantly checking that:
- the spraying pressure always remains within the job features set for each single nozzle;
- in case of many possible nozzle configurations, the operating pressure of the configuration in use is as close as possible to the operating range of
the nozzle;
- required number of nozzle changes is as low as possible.
When setting a treatment in Selejet mode 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. 84).
• NOT compatible nozzles
: the rate at 1 bar of the ISo05 nozzle is HIGHER than the rate at 5 bars of the ISo02 nozzle (Fig. 85).
ok
Fig. 84
no
Fig. 85
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 job (par. 11.2 and 13.1.2) Bravo 400 automatically checks the rates and in case the conditions are not
respected the computer will display the message
Wrong nozzle configuration!
Speed (km/h)
Summary of Contents for 46742DX1
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