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9
Product HandBook
SpotPro
™
Spray Boom Calibration
Accurate calibration is an essential element of any spraying function as it ensures that the chemical is applied
at the rate specified on the product label. Application in excess of the recommended rate may be dangerous,
can damage crops and is uneconomical.
Calibration must be carried out:
•
When spraying for the first time with new spray equipment
•
At the beginning of each season
•
After changes of nozzle tips, spraying pressure or vehicle speed
•
After every 100 hectares of spraying
PPE appropriate to the chemicals being used must be worn at all times when calibrating the SpotPro. As a
minimum, the PPE should include coveralls, gloves and boots. A face shield and PVC apron are recommended.
Calibration Procedure
Check the label on the chemical container for the application rate and recommended spray nozzle type, refer
to Figure 3, which shows the TeeJet AIXR nozzle application chart. To apply a specific rate of chemical to the
target surface, work out the:
•
total sprayer output,
•
travel speed, and
•
the swath width.
Using these parameters, the application rate is calculate as follows.
Measure Total sprayer output [L/min]
Set the pressure at the correct level for spraying determined by the type of nozzles. All nozzles used for
spraying should be left on. For initial trials, set the pressure regulator at approximately 2 bar and adjust as
needed.
•
Fill the spray tank with clean water, refer to Filling the SpotPro Tank procedure below. Run the sprayer at
the correct pressure with all nozzles operating.
•
Place a measuring jug under first nozzle for one minute, then measure how much water is in the jug.
•
Repeat for all nozzles. Nozzle output should not vary by more than 10%. If it does, the nozzle could be
worn or damaged and should be replaced.
•
Add all the jug measurements to find the total sprayer output in litres per minute.
