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4 - Sprayer Setup
TWIN Air System
Adjusting the Air Assistance
The air speed and angling must always be adjusted individually for each spray job and the given weather conditions. It is
always a good idea to get used to a new sprayer out in a field with only water in the tank - on this occasion the following
routine for air adjustment should be practised:
1. Start with a vertical air stream (no angling).
2. Set the air speed: See the following section "Setting the air speed - Rules of Thumb".
3. Find the best angling: See the following section "Angling of Air and Spray Liquid - Rules of Thumb".
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ATTENTION! Fine tuning of air speed and angling will often be necessary during the spraying job.
It is easiest to find the best air setting to reduce drift when the sun is low and behind the boom. This condition makes
the drift more visible.
Setting the Air Speed - Rules of Thumb
Step 1
Find the range of air speeds that causes a minimum drift of the spray mist.
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 minimized - note the minimum setting.
2. Increase the air speed, until you see drift again - note the maximum setting.
• Bare ground / low crop: The range of air speeds is usually very small. Too high an air speed can cause reflection of the
spray liquid and leave dust on the leaves, which again reduces the effect of the plant protection product.
• Taller crop: The taller the crop, the wider the range of air speeds that can reduce drift.
• At higher wind speeds: More air is needed from the sprayer and it is advisable to drive more slowly and use minimum
boom height (40 cm).
Step 2
Set the optimal air speed within the possible range noted.
Air speed recommendations:
• Bare ground / low crop: Use low air speed within the possible range.
• Taller crop / dense crop: Deeper crop penetration requires more air on the sprayer (if you are in doubt, test with water
sensitive paper).
Driving speed:
• Higher driving speeds require more air on the sprayer.
Volume rate:
• Lower volume rates require more air assistance to prevent drift.
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