Nozzles - Goldacres Crop Cruiser G6 Operator's Manual

Flow Meter
• Perform a self test, choose a high speed and high
rate so that the tank will empty relatively quickly
but make sure the pressure does not exceed 60
PSI.
• When the tank is empty, on the Raven controller
press 'Total Volume' to read what the Raven
flow meter has output to the boom. Record the
reading.
• Check the volume of the tank to see what has
been sprayed out to the boom. Record the
reading.
• Compare the reading from the controller with
the known volume from the tank. If there is
a relatively large discrepancy (i.e. more than
100 litres out of a 6000 litre tank), the flow
meter should be removed from the sprayer,
disassembled and the condition of the turbine
checked and cleaned. It should be able to spin
freely.

Nozzles

As part of your daily sprayer calibration, Goldacres
recommends you carry out a simple "jug test" to
ensure the spray nozzles you are using are delivering
the correct amount of chemical, as stated in your
nozzle supplier's rate chart.
Jug Test
The method of carrying out the "jug test" is
described below.
You will need:
• A calibrated measuring container that can
measure the medium in litres, in 10 ml
increments. e.g. 0.45 L.
• A timing device that counts seconds.
• A pressure gauge mounted at the nozzle tip to
verify the system pressure being delivered at
the nozzle. Goldacres part number GA5077983
will enable mounting of a suitable gauge to
the nozzle body bayonet fitting (not including
gauge).
G4.7, G5, G6 Crop Cruiser Operator's Manual MY19 - REV 0
• The flow meter should then be reassembled and
replaced on the sprayer. Perform the volume
check again and if there is still a discrepancy, the
'Meter Cal' value can be changed
i.e. If volume from the controller reads 6100 litres
instead of 6000 litres and the original Meter Cal
value is 185, then:
New 'Meter Cal' value = (185 x 6100) / 6000 = 188
Every sprayer should be calibrated regularly to
ensure minimal error in the application rate. A nozzle
selection chart indicates what application rates
are to be expected. Variations due to nozzle wear,
ground speed error and pressure irregularities can all
add up to result in large application rate errors.
PROCEDURE:
1. Check the plumbing system for kinked or
obstructed hoses and repair or replace any hoses
that might restrict the normal flow of the liquid.
2. Start your sprayer and initiate a 'self test'
procedure on your rate controller console. Set
the application rate and speed to the values given
in your rate chart that match your desired spray
output.
3. Then place the jug under one of the nozzles, for
exactly 1 minute and record the volume of liquid
collected.
4. Repeat the test over a representative sample of
the jets in each boom section.
5. Compare the volume collected from each nozzle
to the stated volume in your nozzle supplier rate
chart. Variation should be no more than plus or
minus 10 %.
Continued over page
Chapter 6 - Calibration - 65