Croplands PEGASUS 4000, Parts & Operators Manual, Page: 58 / 168

4.6
Pegasus BT-POM 1212 - Rev 3
Sprayer Calibration Calibration Procedure
Step 7
Calculate Application Rate
When operating the spray controller, the
controller automatically calculates and
shows the rate of application.
Application Rate (l/ha) =
Spray Output (l/min) x 600
÷
Speed (km/hr)
x
Swath Width (m)
eg, [18 x 600]
÷
[12
x
18]
= 50 l/ha
f) Discard and replace any nozzle that
deviates more than 10% from the
specified output (eg with a 0.5 l/min
specification- discard any nozzles
0.45 l/min and under or 0.55 l/min
and over).
g) Check replacement nozzles by
collecting and measuring output
from each replacement.
h) Record the output of each nozzle on
the boom. Add the outputs together
and divide by the number of nozzles
to get the required output of each
nozzles in one minute.
eg, Total spray output 18 l/min ÷
36 nozzles = 0.5 l/min per
nozzle.
Spray tip wear - courtesy of Teejet.
c) Collect and measure the volume of
spray from one nozzle and adjust
pressure so that the nozzle gives the
specified output (eg 0.5 l/min).
IMPORTANT:
Do not use a worn nozzle to set the
pressure setting and nozzle rates.
If the boom is not fitted with new
nozzles, fit one new nozzle and use it
to set the flow rate and pressure
setting.
This sets the standard flow rate,
pressure setting and spray pattern
with which to test the performance of
other nozzles.
Do not use a worn nozzles to set the
pressure setting and nozzle rates,
otherwise inaccurate calibration will
occur.
CAUTION
d) When the pressure is set to give a
specified nozzle output (using a new
nozzle), collect and measure the
volume of spray from each nozzle for
one minute in a collection jar or
calibrating jug.
Specially designed nozzle testing
equipment such as nozzle calibrating
jugs can be used to simplify nozzle
calibration.
e) Visually check nozzle spray patterns
and spray angle for accuracy and, if
necessary, replace any faulty nozzles.