Page 13
Calibration Worksheets
The two worksheets below can be used to record the results of calibration tests on your sprayer.
Calibration and Nozzle Selection
Nozzle Selection Example
This example applies to a 200 litre model with 5
nozzles per side but the same procedure can be
used for the larger models by allowing for the
additional nozzles in the calculation 3b).
STEP 1
a) Required application rate
= 800 l/ha
b) Chosen speed
= 5 km/hr
c) Row width
= 3 m
d) Spray pressure
= 25 Bar
STEP 2
Total spray output needed (l/min) =
Application Rate(l/ha) x Speed (km/h) x Row width(m)
600
=
800x5x3 = 20 l/min
600
STEP 3
a)
For a standard application on a 200 litre
unit using 5 nozzles per side, with each giving an
equal discharge, refer to Chart No. 1 on the
previous page.
The chart shows Nozzle Set 2 (1.0 mm jets and CC
swirl plates in all nozzles) will give 19 l/min at 25
Bar. Install this Set and spray at a little over 25 Bar
to achieve the 20 l/min required.
For 400 or 500 litre sprayer models refer to Charts
No. 2 and No. 3, respectively.
b) For non standard applications calculate the
flow required for each nozzle then consult the
Nozzle Output Chart on the page 13 to select the
jet and swirl plate to install in each nozzle.
Output per side (l/min) = Total output (l/min)
2
= 20 = 10 l/min
2
If for example, 12.5% of the flow is required from
the top and bottom nozzles and 25% from the
others, make the calculations in the table below.
NOZZLE SELECTION CALCULATION
Nozzle No.
from top
% Flow
each nozzle
Desired Nozzle Output (l/min)
= Flow per side x %
100
Jet/Swirl
Size
Flow Rate
(l/min)
from Chart
1
12
.
5
10 x 12
.
5/100 = 1
.
25
0
.
8/CC
1
.
3
2
25
10 x 25/100 = 2
.
5 1
.
2/CC
2
.
6
3
25
= 2
.
5
1
.
2/CC
2
.
6
4
25
= 2
.
5
1
.
2/CC
2
.
6
5
12
.
5
= 1
.
25
0
.
8/CC
1
.
3
Total
100
Total Flow per Side (l/min)
10.4
Fit 0.8/CC jets/swirl plates in nozzles 1 and 5 and
1.2/CC in nozzles 2, 3 & 4. Use a little under 25
Bar to reduce the output to 10 l/min per side.
STEP 4
Fill the tank with water to a mark. Run for 2
minutes at 540 PTO rpm and a little under 25 Bar
with all nozzles operating. Measure the
volume to refill to the mark. This should be very
close to 40 litres if calibration is correct.
