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Calibration of your Field Sprayers using Shortcut Methods

Calibration of your Field Sprayers using Shortcut Methods. Pesticide Education Program Montana State University Extension. Calibration Benefits You!. You will not under apply Maintains the Best Pest Control Will not over-apply Environmental and human safety risks No need to re-apply

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Calibration of your Field Sprayers using Shortcut Methods

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  1. Calibration of your Field Sprayers using Shortcut Methods Pesticide Education Program Montana State University Extension

  2. Calibration Benefits You! • You will not under apply • Maintains the Best Pest Control • Will not over-apply • Environmental and human safety risks • No need to re-apply • Effective use of time • Save $$

  3. Follow Along Using MSU Reference Materials • Use the MontGuide titled “Calibrating Ground Sprayers Using Shortcut Methods • Save time with the 5940 method • 128th Acre Method • Backpack Sprayers • Boom Sprayers • Shortcut for Broadjet Sprayers

  4. Suggested Calibration Tools • Stopwatch • Measuring Tape • Measuring Container • Pencil and paper • Source of fresh water

  5. 5940 Method can be used to Select Appropriate Nozzles • Can get you close to your target GPA. • Your product label often describes the proper GPA (gallons per acre) for your sprayer. • example. 20 GPA is recommended • Use the 5940 METHOD to find nozzle size

  6. What is the 5940 method? • GPA = Gallons Per Acre (product label) • GPM = Gallons per Minute collected from a single nozzle (Make sure all nozzle are within a 10% range.) • 5940 is a constant • MPH = Field Speed • W = 1) width between nozzles in inches or 2) width of a broadjet swath in inches.

  7. Selecting the Appropriate Nozzle • GPM = GPA * W * MPH / 5940 • Let’s say you need to spray 20 GPA, you have 30” spaced nozzles, and you will drive 5 mph. • GPM = 20 GPA * 30” * 5mph / 5940 • 0.505 or 0.5 GPM nozzles needed Purchase nozzles rated at 0.5 GPM!

  8. Using 5940 to get an idea what your field speed should be • Let’s say you need to spray 10 GPA, you have 24” spaced nozzles, and your nozzles deliver .2 gallons per minute. • Speed = (GPM x 5940) / (GPA x W) • Speed = 1188 / 240 • Field speed = 4.95 miles per hour

  9. Shortcut Method to Calibrating Backpack Sprayers

  10. Backpack Sprayer (Calibrating GPA) 128th Acre Method • Use water when calibrating • Use same nozzles and filters as when spraying • Measure an 18 ½ by 18 ½ ft area. • Spray area with water and time how long it takes • Constant speed and constant pressure • Spray into container for same amount of time. • Ounces = Gallons Per Acre Applied

  11. Sample ScenarioUsing 128th Acre Scenario • Takes 10 seconds to spray 128th Acre • In 10 seconds you spray 10 ounces into a container. • What is the GPA output? 10 GPA

  12. SHORTCUT METHOD TO CALIBRATING BOOM SPRAYERS Find GPA? How?

  13. Check nozzle spacing and height

  14. Worn Spray Tips

  15. Boom Level or Nozzle Angle Correct

  16. Verify that all nozzles are equal

  17. Due to problems with wear you must test uniformity of nozzles annually • Check nozzle output for 1 minute and get average • If each nozzles output is not greater or less than 10% off of average, all is well. • How?

  18. 10% error level • To find 10% • Find your average…48 oz • Move the decimal place one space to the left. 48. = 4.8 This is a 10% error • Now add 4.8 to 48 for +10% • Subtract 4.8 from 48 for -10% • 10% Error range = 43.2 and 52.8 • Any nozzle output between 43.2 and 52.8 is OK!

  19. GPA for Boom Sprayer cont.Shortcut Method 1st – Determine Nozzle output is same. 2nd – Flag out Course Length based on your nozzle spacing 18” = 227’ course length 20” = 204’ course length 30” = 136’ course length 40” = 102’ course length • Or 340 / spacing in feet 3rd - Drive course in gear and rpm you will use when spraying and time yourself. Repeat 2 – 3 times.

  20. GPA for Boom Sprayer cont.. 4th - Collect liquid from 1 nozzle for this amount of time 5th - Ounces of liquid collected = GPA

  21. Sample Scenario Boom Sprayer • 18” wide nozzles, 6 nozzles • What to do? • Travel 227’ and time • 30 seconds • Measure amount delivered in that 30 seconds • 15 ounces in 30 seconds • 15 GPA

  22. Broadjet Sprayers • Determine Test Strip Distance: • Divide your spray swath (ft) into 340.3 then multiply times 10. This is your test strip distance (example: 340.3 / 30 feet = 11.34 x 10 = 113.4 feet. • Run test strip and time • (it took 25 seconds to drive 113.4 ft). • Collect your broadjet output (ounces) • For the time it took to drive test strip • (Collected 130 ounces in 25 seconds). • Divide the amount collected in ounces by 10. • This equals GPA.130 / 10 = 13 GPA

  23. Sample Scenario - Broadjet • 25’ wide swath, 1 Broadjet • What to do? • Travel 136’ and time • 27 seconds • Measure solution delivered in 27 seconds • 200 ounces in 27 seconds • What is the GPA? • 20 GPA

  24. Fine tune your GPA by adjusting: • Speed • Slower speed increases output • Pressure • Only slight adjustments • Nozzle size • Use 5940 to get you close • Not meant for fine adjustments • Nozzle spacing • Often preset

  25. You know GPA, now how much solution do you need? • Acres * GPA = Volume in Tank • 10 acres * 30 GPA = 300 Gallons

  26. How much chemical do you need? • Acres * product rate = Total Product • Product Rate = 2 pints / Acre • You will be spraying 10 acres • 20 pints of product

  27. Sample Questions You have an output of 20 GPA You need to spray 300 acres #1 - How much of a spray mixture will you need? 6000 gallons You need to apply 2 oz / acre of Warrior 1E. #2 - How much product do you put in tank? 600 oz of Warrior

  28. Questions Continued #3 You have 20” nozzles and travel 204’ in 25 seconds. What next? -You collect 10 ounces in 25 sec. -What is your GPA? GPA = 10 GPA

  29. Question continued You are trying to select a nozzle and it reads XR11004B. #4 What type of nozzle is this? • Extended Range Flat Fan #5 What angle of spray mist is emitted from these nozzles? • 110 degrees #6 How low can you hold this boom at this spray angle? • 15 – 18” #7 How many gallons per minute does this nozzle emit at a standard pressure? • .4 Gallons Per Minute (standard 40 PSI) #8 What material is this? • Brass #9 What is the nozzle life of this nozzle? • Poor

  30. Questions? #10: What width and length would easily qualify for using the short cut 128th acre method for calibrating your backpack sprayer? 18 1/2 x 18 ½ feet

  31. Making this even more easy with the ‘Calibration Assistant’. • Contains the tools to make calibration easier. • Can aid in testing output of nozzles • Aids in determining output (GPA) for many types of equipment • Conversion Page • Instructions • Determines • product to add to tank • acres you can cover

  32. Aids in Testing Uniform Nozzle Flow • Critical prior to assessing output of boom sprayers. • Calibrations Assistant Makes the math easier, while walking applicators through the process.

  33. Aids in Determining Output of Boom Sprayers

  34. Aids in Determining Hand Sprayer output (GPA)

  35. Aids in Determining Broadjet Sprayer Output

  36. Aids in Determining the Output of your Rotary or Drop Spreaders

  37. Includes a Spreadsheet to Aid in Conversions

  38. Practical Tool • Not meant for initial training purposes • Important that applicators have a base understanding of calibration • Not meant as a crutch which allow applicators in initial training to slack • Support tool useful for • Certified Applicators who have some base knowledge

  39. Available from the MSU Distribution Center The Calibration Assistant CD $3.00 copy • Distribution Center Communications & I.T. Po Box 172040Bozeman, MT 59717 Tel: (406)994-3273Fax: (406) 994-2050Location: 115 Culbertson orderpubs@montana.edu

  40. Questions

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