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Sprayer Calibration


Boom Sprayer Calibration
Boomless Sprayer Calibration

Boom Sprayer Calibration

1. Determine the spacing between nozzles in inches..


2. Refer to the following chart to determine how far you need to test spray to calibrate drill:


Nozzle Spacing

Length of Calibration Course

15 inches

272 feet

18 inches

227 feet

20 inches

204 feet

22 inches

186 feet

24 inches

170 feet


To determine calibration course for a nozzle spacing not listed divide 340 by the spacing expressed In feet.


Example: Calibration distance for 19 inch nozzle spacing: = 340/(19/12) = 215 feet.


3. Measure and stake off the appropriate calibration course based on nozzle spacing, The course should be on the same type of ground that will be sprayed. (Speeds may be faster on roads than on sod which can alter application rates.)


4. Drive the course in the gear and rpm you will use when actually spraying and record the time in seconds. Run the course at least twice and the average your times to cover the marked area.


5.. Park the tractor and maintain the same rpm as you conducted the calibration run in. Turn on the sprayer and catch the water from one nozzle for exactly the same number of seconds that it took to drive the calibration course.


6. Ounces caught will equal gallons per acre.


7. Check all nozzles, Flow rate should not vary more than 10%among all nozzles. Clean or replace any nozzles that do not fall within the10% range.

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Boomless Sprayer Calibration


1. Measure effective swath width or area that will be sprayed by the nozzles.


2. Refer to the following chart to determine calibralion course:


Swath Width

Length of Calibration Course

35 feet

157 feet

40 feet

136 feet

45 feet

121 feet

50 feet

109 feet



To determine the length of calibration course for a swath width not listed, divide 5460 square feet (1/8 acre) by the swath width in feet.

Example: Calibration distance for 32 feet swath width = 5460 /32 = 171feet.

3. Drive the course in the gear and rpm you will use when actually spraying and record the time In seconds. Do this at leasat twice and average the time.


4. Park the tractor and maintain the same rpm.


5, Turn on the sprayer and use a trash bag and bucket to catch the water for exactly the same number of seconds required to drive the calibration course.


6. Pints caught = gallons per acre.


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Video provided by Missouri Department of Conservation.



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