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Calibration of your Field Sprayers using Shortcut Methods

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Use the 5940 METHOD to find nozzle size. What is the 5940 method? GPA = Gallons Per Acre (product label) ... Measure an 18 by 18 ft area. Spray area with ... – PowerPoint PPT presentation

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Title: Calibration of your Field Sprayers using Shortcut Methods


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
  • Lets 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
  • Lets 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 Scenario Using 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
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34
Aids in Determining Output of Boom Sprayers
35
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36
Aids in Determining Hand Sprayer output (GPA)
37
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38
Aids in Determining Broadjet Sprayer Output
39
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40
Aids in Determining the Output of your Rotary or
Drop Spreaders
41
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42
Includes a Spreadsheet to Aid in Conversions
43
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44
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

45
Available from the MSU Distribution Center
  • The Calibration Assistant CD
  • 3.00 copy
  • Distribution Center Communications I.T. Po
    Box 172040 Bozeman, MT 59717 Tel
    (406)994-3273 Fax (406) 994-2050 Location 115
    Culbertson orderpubs_at_montana.edu

46
Questions
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