4.5
Pinto BT-POM 1212 - Revision 5
Section 4 Calibration Procedure
b) Calculate Required Nozzle
Flow Rate
If you know:
• the application rate required
(eg 50 l/ha),
• speed of travel (eg 12km/hr),
• swath width (eg 18m), &
• the number of nozzles on
the boom (eg 36).
The following formula can be used
to establish required fl ow rate per
nozzle:
Nozzle Flow Rate (l/min) =
Speed (km/hr) x Swath Width (m)
x Application Rate (l/ha) ÷ 600 ÷
Number of nozzles
eg, [(12 x 18 x 50) ÷ 600] ÷ 36
= 0.5 l/min for each nozzle
An alternative formula is:
Nozzle Flow Rate (l/min) =
Speed (km) x Nozzle Spacing (cm)
x Application Rate (l/ha) ÷ 60,000
eg, [12 x 50 x 50] ÷ 60,000
= 0.5 l/min
Now using the nozzle chart look down
the nozzle capacity column (l/min) and
select a nozzle to suit the output (eg 0.5
l/min). Refer to pages 4.9 to 4.11 for nozzle
charts.
Step 5
Fit the Selected Nozzles to
the Boom
Fit the selected nozzles to the boom as per
the nozzle manufacturers specifi cations.
Step 6 (Recommended)
Check Nozzle Accuracy &
Determine Nozzle Output
Test the actual output of the nozzles using
the following procedure:
a) Ensure there is adequate water in
the tank.
IMPORTANT: Do not use mixed
pesticides for testing.
b) Start the sprayer and set the
spray Controller master switch
into MANUAL position and adjust
the operating pressure (PTO to
continue instructions).
Always use Actual Speed of Travel for speed in
the above formula.
NOTE
Remember when selecting nozzle outputs that
higher pressures and wider spray angles usually
give fi ner droplet sizes than lower pressures and
narrower spray angles.
NOTE
Nozzle selection chart- courtesy of Teejet.
L/min column on nozzle chart - courtesy of Teejet.
Do not use mixed pesticides for testing. Use only
clean water.
Use of pesticides when testing is hazardous to
your health.
WARNING
Test the actual output of the nozzles.
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