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Proper calibration is one of the most important parts of spraying. Propery cailbrated sprayers will save you
both time and money.
How to determine the gailcns per minute (per nozzie),
_____
~rW
~P~es Per Hio~r
4~ozz~e epeckig (b~ boom spre~rh~g)
This formule is useful to determine which
tip
to use on your boom, especially when your nozzie spacing is
different from the standard 20" or 40" nozzle spacing on Precision Products, mc, Sprayers~ For example: You
know you want to travel 3 MPH~, apply the chemical at a rate of 20GPA~ The nozzle spacing's are 33" on
center. By using the formula you will determine how many gallons per minute (GPM) per tip will be required
to give you the correct application.
Example: 20 GPA x 3 MPH
=
60 x 33" (nozzle spacing)
=
1980 divided by 5940
+
.333
GPM
You have now determined that you need a tip with GPM of
.333.
Find the type of tip you want to use. For
example, an 80 degree flat fan spray tip and then determine what pressure you plan to spray aL Let's say 30
PSL
How do you check this calibration? By using this formula.
~PA
5940
x ~ (Per Nozz~e)
MPHxW
Multiply 5940 x .333 GPM
+
1783.8.
Multiply
3 MPH
x 33 (nozzle spacing)
=
99. Divide 1783.8 by 99
=
18.06
gallons per acre.
13y simply adjusting your pressure or your tractor speed, you will obtain the 20 GPA rate,
The second formula is used to determine whether an old tip (one on which you cannot identify the number)
is still spraying the right amount of chemicals. You can determine how many GPM a tip is spraying, with the
use of a catch jar and stop watch. Hold the jar under the tip so you catch the total spray for one minute. The
amount in the jar indicates the GPM.
Calibrate your sprayer carefully. 1f your tips are worn, replace them, New tips are a fraction of the cost of
using either too much or too
little
chemicals, Also, you can use these formulas to help determine if the
intended pump has the volume capacity to meet your spraying rieeds.
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