Hi, this is Devon from Gempler’s Product
Support. Today, we’re going to go through how to calibrate
your sprayer. Calibrating your sprayer is necessary to ensure
accurate application rates and provide effective pest control. Spraying the proper amount and getting the
most even dispersement is critical to your success. You need to know how much chemical you are
applying for four important reasons. If you are applying a different amount other
than what is directed on the label, you could be:
Violating the law and could be fined Risking the chance of damaging desirable plants
in the area Wasting money on pesticide that is sprayed
unnecessarily Ineffectively controlling your target pest Be sure to check the instruction manual for
your sprayer. The manufacturer might have a specific method
they would like you to use. There are different methods for calibrating
your sprayer, today we are only going to use one. Here are the tools you will need to calibrate
your sprayer: Sprayer Rig
Stopwatch Measuring Tape
Measuring Container (graduated in ounces) or Digital Sprayer Calibrator
Flags or Stakes (for marking) Pocket Calculator
Pen and Paper for recording your data Before you begin it is important to make sure
you’re wearing the proper personal protective equipment
Goggles, gloves, closed-toe shoes and long sleeves are some of common articles of PPE
that might be required. Always start with a clean sprayer. Fill your sprayer about half full with clean
water. The first thing to do is measure the spacing
between the nozzles in inches. In the field, measure out a test course that
corresponds to the distance between your nozzles. Our nozzles were spaced 20 inches apart, so
our test course is going to be 204 feet. With the course set up, taking a running start,
run the course from start to finish at the speed you’ll be applying your chemicals. Measure the time in seconds. Once you’re done running the course, park
your rig and set the breaks. If appropriate for your spray rig keep the
engine running at the same RPM you used to run the course. Set your sprayer pump pressure correctly for
the sprayer tip type that you have and the desired gallons per minute of chemical that
you would like to apply. This information can be found on the instruction
manual for your sprayer as well as in the pesticide labeling. Using your plastic container marked in ounces,
collect water from each tip for the same amount of time it took you to drive the test course. Check to see that the flow rate from each
nozzle is approximately the same. Replace or clean any nozzle whose output differs
by more than five percent from the average for all of the nozzles. Check flow rates again if any nozzles
needed to be replaced. In this example, the average nozzle output
is 13.4 ounces. Five percent of 13.4 ounces is 0.67 ounces. Any nozzle whose output differs from 13.4
ounces by more than 0.67 ounces should be cleaned or replaced; that is, any nozzle whose
output is greater than 14.07 or less than 12.73. In this example, all were within an acceptable
range. Once all your spray tips are outputting within
5% of each other, your average spray tip output for your course time is used to calculate
your gallons per acre. So for our example, our gallons per acre is
13.4. For minor adjustments in output:
Adjust the sprayer pressure to achieve the gallons per acre required by the pesticide
labeling. For major adjustments:
Change the travel speed or change the spray tip size. If you change your spray tips or make any other adjustments, be sure to recheck your flow rates and recalibrate your rig. For help with any questions on sprayer calibration,
on pesticide labeling or finding the correct spray tips, contact Gempler’s Product Support. Thank you for watching. Let us know what you thought of this video
or if you have suggestions for future video topics.