Goldacres Windrow MY18 2500L, Operator'S Manual, Page: 25 / 74

Chapter 6 - Calibration - 19 Windrow 2500L Operator’s Manual MY18 - REV 1
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).
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 %.
In the event that any of your nozzles do not deliver
the required volume, a further investigation is
required. This may include, but not be limited to;
• Cleaning the nozzles using the method
recommended by the nozzle supplier.
• Replacing the nozzles.
• TeeJet advise that nozzles that flow greater than
+10% of their stated volume are ‘worn out’ and
should be replaced.
• Cleaning nozzle filters.
NOTE: Uneven volumes from individual nozzles will
result in variations in the application rate across the
width of the boom. Spray efficiency will be reduced.
Crop damage may result.
If you have any further questions, Goldacres
recommends that you contact your nozzle supplier
or your Goldacres dealer for additional information.
Download your free copy of ‘A user’s guide to
spray nozzles’ from the TeeJet website. Also Lechler
nozzle selection catalogue and Users guides to spray
nozzles are available from your Goldacres dealer, or
as a free download from the TeeJet web site: www.
teejet.com or Lechler web site: www.lechler.de
Nozzle Calibration