Goldacres 3PL 1000L, Руководство оператора и каталог запасных частей

Страница: 20 / 60

20
Calibrating your sprayer
Any 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 but
variations due to nozzle wear, ground speed
error and pressure irregularities can result in
large application rate errors.
Goldacres suggest the use of a current TeeJet
nozzle selection catalogue for reference to
nozzle sizes, outputs, spray patterns and
general spraying information. For more
technical information on the function of spray
nozzles and factors affecting their performance
you can also use the TeeJet “User’s guide to
spray nozzles”.
The TeeJet nozzle selection catalogue and
Users guide to spray nozzles are available
from Goldacres dealers or as a free download
from the TeeJet website. www.teejet.com
Application Rate
The application rate depends on the following:
Spray pressure - increasing pressure
increases application rate and reducing
pressure reduces application rate
Speed of travel - increasing speed reduces
application rate and reducing speed increases
application rate
Nozzle size - increasing the nozzle size
increases the application rate.
Ground Speed
The ground speed read out on modern
tractors should be sufficiently accurate for
spraying but if in doubt check it for accuracy
by the following method.
Measure and mark a distance of 100 metres.
Fill the sprayer with water and engage the
PTO to simulate normal spraying conditions.
Approach the starting mark at the required
spraying speed and accurately measure the
time in seconds to reach the finishing mark.
The ground speed can be calculated as
follows.
Application
Nozzle output (l/min) x 10,000
rate (L/Ha)
=
Spray width (m) x speed (m/min)
Nozzle Selection
Refer to the chemical manufacturer’s
information to determine the recommended
application rate in litres per hectare (l/ha) for
your particular situation. Then determine the
speed in kilometres per hour (km/hr) at which
you intend to spray, taking into consideration
the ground conditions of the area to be
sprayed. Using the appropriate chart for your
boom select the most suitable nozzle to use.
Nozzle Calibration
As part of your daily sprayer calibration,
Goldacres suggests that you carry out a 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.
The method of carrying out the jug test is as
follows:
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 showing seconds.
• A pressure gauge mounted at the nozzle
tip to verify the system pressure being
delivered at the nozzle. Goldacres part
number GA5077983 (Nozzle cap & washer)
will mount a suitable gauge to the nozzle
body bayonet fitting. (Not including
gauge).
NOTE: There may be a noticeable difference
between pressure shown on main spray
pressure gauge on sprayer and the gauge
installed on the boom. This is due to pressure
loss through the circuit.
1. Check the plumbing system for kinked or
obstructed hoses and repair or replace any
hoses that restrict the normal flow of the
liquid.
2. Start your sprayer
a. For sprayers not fitted with a spray
application controller, set the boom
operating pressure to the pressure at
which you expect to spray.
b. For sprayers fitted with a spray application
controller, initiate a ‘self test’ procedure
and set the application rate and speed to
the settings depicted in your “Rate Chart”
at which you expect to spray.