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06
Calibration Procedures
This table gives a step-by-step guide to the standard method of sprayer calibration
Boom Sprayers Hydraulic Nozzles
Read the Label
Spray Volume
Product Dose
Spray Quality
Measure TIME per
Measure time in seconds over land similar to that to be sprayed
100 Metres
Calculate SPEED
SPEED = 360 divided by TIME
km/h
Measure nozzle
Normally 0.5 metres (50cm)
SPACING
Measure TIME per
output = volume x speed x space ÷ 600
100 Metres
litres/min litres/hectare km/hr metre
Select NOZZLE
Refer to nozzle manufacturers data charts or other sources and select
the size and type of nozzle that will produce the calculated OUTPUT and
required spray QUALITY
Now, check the calibration on the sprayer
Check nozzle output
With water, check outputs of 4 or more nozzles using a calibrated jug
or flow meter.
Check all nozzles are aligned correctly and spray patterns are good
Calibrate SPRAYER
SPEED = 360 divided by TIME
km/h
As the nozzle output and therefore the spray volume are less than target figures, increase the pressure to, say 2.5 bar and
repeat the calibration to achieve 200 litres/hectare
Now, record the details as calculated
Nozzle Fitted
11004 - RED
Spray Volume
200 litres/hectare
Spray Pressure
2.5 bar
Spray Quality
Medium
Forward Speed
8.6 km/h
seconds
seconds
Rapid Spray Marshal Unit Operator's Handbook
Example
200 litres/hectare
50 litres/hectare
Medium
41.9 seconds
360/41.9 = 8.6km/h
0.5 metres
200 x 8.6 x 0.5 ÷ 600
Average output = 41.9
litres/minute
1.40 x 600 ÷ 0.5 ÷ 8.6
Rapid Spray Equipment by Rapid Spray
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