Twin Air Assistance; Adjusting The Air Assistance; Adjusting The Air Speed, Rules Of Thumb - Hardi ALPHA evo EcoDrive TWIN FORCE Instruction Book

TWIN air assistance

Adjusting the air assistance

The air flow rate and the air flow direction should always be adjusted individually for each spraying operation and according
to weather conditions. It is always a good idea to get used to a new sprayer out in a field with only clean water in the tank,
following this procedure:
1. Start with the vertical angle
2. Set the air speed: see section "Adjusting the air speed"
3. Select the best angle: see section "Air flow and nozzle angle"
4. Fine tune the air speed: see section "Adjusting the air speed"
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ATTENTION! Fine tuning of air speed and angling will often be necessary all through the spraying job.
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ATTENTION! It is easiest to find the best air setting to reduce drift when the sun is low and behind the boom
(backlight). These conditions make the drift more visible.

Adjusting the air speed, rules of thumb

Step 1:
Find the range of air speeds that can control drift.
1. Start with the air setting at zero and keep increasing the air speed just to the point where you can see that the drift
cloud is minimised - note the minimum setting.
2. Then increase the air flow rate until you see drift again - note the maximum setting.
The range of air flow rates that should make it possible to obtain the least drift is now defined.
Bare ground/low vegetation: The range of air speeds is usually very small.
Taller crops: The taller the crop the wider the range of air speeds that can reduce
drift.
At high wind speeds: the sprayer requires more air flow. It is also recommended to drive more slowly and to lower the
boom as far as it will go (40 cm).
Too high air flow over bare ground/low crop can cause reflection of the spray liquid and leave dust on the leaves of
plants, which can again reduce the effect of the plant protection chemicals.
Step 2:
Adjust the optimum air flow rate within the range of possible rates mentioned above.
Air flow rate recommendations:
Bare ground/low vegetation: Define the maximum air flow within the possible range.
Taller crops: A higher air flow rate in the sprayer encourages penetration (if in doubt, check with moisture sensitive
paper).
Forward speed: A higher air flow rate is required in the sprayer in the case of higher forward speed.
Application volume: Lower application volumes require more air assistance to prevent drift.
4 - Sprayer setup
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