Croplands PEGASUS 4000, Parts & Operators Manual, Page: 54 / 168

4.2
Pegasus BT-POM 1212 - Rev 3
Sprayer Calibration
Proper calibration considers all spraying variables.
Applying the correct amount of chemical
to a crop is only possible if:
• the sprayer is calibrated correctly.
• the sprayer is operated correctly.
• the sprayer is maintained correctly.
The variables of spray application
(distance, time, working width, liquid and
chemical volumes) must be measured and
controlled accurately to ensure chemicals
are applied at the correct rate.
The automatic spray controller measures
and controls the variables of speed and
flow rate to give constant application.
However proper nozzle selection,
checking calibration of nozzles, speed
and flow rate as well as correct mixing
of chemicals must be done to ensure the
accuracy and performance of the sprayer
and its controller.
Accurate calibration is essential to ensure
uniform application of the recommended
dose of chemical to the target.
Proper calibration involves setting up
the sprayer (nozzle selection, pressure,
speed), calculating chemical and water
rates and measuring the performance
of the sprayer itself. Only then can you
be totally confident in applying chemical
correctly.
Fully Automatic Spray
Controller
The fully automatic spray controller
maintains the application rate (set by the
operator) when operated in Auto position.
The controller monitors speed of travel
(speed sensor) and flow rate (flow meter)
and automatically adjusts flow rate
(via a servo valve) to maintain correct
application rate irrespective of speed
variations within the limits of the nozzles
used.
IMPORTANT:
1. It should be remembered that the
spray controller does not eliminate
the necessity to measure and check
the accuracy of nozzle spray patterns
and outputs. These must be checked
regularly to ensure correct and
uniform application rates because
nozzles wear with use.
2. Flow meters used by the controller
also needs to be checked and
calibrated on a regular basis.
On the following page, you will see
how to maintain and check your
Rapid-check flowmeter. It is
recommended you do this regularly
during the spraying season.
See the Controller Operator’s
Manual for detailed information and
calibrating procedures specific to
your spray controller.
Calibration
Procedure
For accurate spray rate application, follow
this calibration procedure:
Step 1
Ensure Equipment Is In
Good Working Order.
Tank, pump, boom, filters and nozzles
must be clean, free of leakages and
functioning properly.
Follow the pre-operation checklist,
maintenance and operating instructions
in this manual.
Install, calibrate and operate the spray
controller according to the spray controller
Installation/Operators Manual.
Calibration Procedure
Rapid Check Flowmeter