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Calibrating Sprayers for Droplet Size….….according to the label
Robert E. Wolf Extension Specialist Application Technology
Biological and Agricultural Engineering
Nozzle Technology……• Nozzles designed to reduce drift• Improved drop size control• Emphasis on ‘Spray Quality’
Nozzle Efficacy/Drift Slope
• XR, TR
• Turbo Flood• Turbo TeeJet• Wilger Designs
• Air Mix• AI XR• GuardianAir
• AI• Ultra Low Drift• Turbo Drop
• TTI
Extended Range
Chamber Design
Venturi Design - I
Venturi Design - II
Nozzle development timeline
Nozzles-Recommended Use
Spray Management Valves
Spray Management Valve
2024283236404448
40 100 200 300 400 500 600 700
Liquid Pressure (psi)
Max
Ver
tica
l R
each
( f
t)
Gun #2 - 20 Gun #2 - 60 Gun #2 - 120
13
6.4
16
57.1 8.8
.9
1.8 2.2
# along curves aredischarge rates in GPM
Vertical Reach at Various Pressures (Spray Gun)
Accurate and efficient applications:Increase Efficacy – Minimize Drift
Converting to a flat-fan and/or drift reducing nozzle
Nozzles are important because:
• Control the amount – GPA.• Determine uniformity of application.• Affects the coverage.• Influences the drift potential.
Calibration!!!!
Ensuring that the spray output is what it is supposed to be!
Calibrating Boom Sprayers – MF2894
Calibration/Nozzle Selection:
• What is the first step?• Use label to select the
– application volume– product rate
• Choose an appropriate travel speed - MPH
• Effective width of application– nozzle spacing
• Calculate GPM – Flow rate per nozzle
• Select the correct size of nozzle!
Flow Rate Equation:
GPMGPA x MPH x W
5940
Equation
• Calculates for amount of flow from one nozzle
• Represents the size of nozzle to put on the sprayer
See Page 173, TeeJet Catalog 50A
GPM Example Solution:
GPMGPA x MPH x W
5940
5940
20x12x7.5GPM
Answer .30gpm
Selecting the proper nozzle….
• Calculate GPM (formula)• Look under GPM column• Match to pressure-psi• Choose the size needed• Operate at given pressure
and speed used in formula to achieve GPA
.30
Page 9, 12, 14, 15
SpotOn Electronic Calibration ToolSuccessful Farming Sponsored and will publish findings.
Scott Bretthauer - U of IJim Wilson - SDSURandy Taylor - OSUBobby Grisso & Pat Hipkins - VTUMark Hanna – ISUBob Wolf – KSU
Calibration!!!!The next phase!
Ensuring that the spray droplet spectrum is what it is supposed to be to maximize
efficacy while minimizing drift!
ASABE S-572.1 Droplet Size Standard
2009
Spray Quality Categories
ASABE Standard S-572.1Category (symbol) Color CodeExtra Fine (XF) PurpleVery Fine (VF) RedFine (F) OrangeMedium (M) YellowCoarse (C) BlueVery Coarse (VC) GreenExtra Coarse (XC) WhiteUltra Coarse (UC) Black
2009
S572
NEW
NEW
Source: Crop Life – July 2002
>150
151-250
251-350
351-450
451-550
>551
ASABE Standard
Page 4
Page 6
- Sole ingredient is 2,4-D: Generate COARSE or COARSER
spray droplets (ASABE S-572)
- When mixed with other actives that require a medium or fine
spray apply as MEDIUM or COARSER spray.
See Page 182, TeeJet Catalog 50A
Selecting The Proper Nozzle
• Calculate GPM (formula)• Look under GPM column• Choose the size needed• Match pressure(psi) and
Droplet Classification• Operate at given pressure and
speed used in formula to achieve GPA and the desired droplet size
Page 9, 12, 14, 15
MEDIUM
0.30 gpm
Fact Sheet: MF2869
www.bae.ksu.edu/faculty/wolf
www.turbodrop.com
Boom Buster – Evergreen Products
XP BoomJet TeeJet
Boom Extender: Hypro
Total Drift Ranked:
INT 9
08
Control
Interlock
0.8
Tap W
ater +
oil
Tap W
ater 3
Tap W
ater 1
Form
ula 1
Interlock
1.25
Tap W
ater 2
Superb
HC + Inter
lock
#PX056-Z
AG 06037
AG 080500.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
36.5 37.7 37.8 41.6 44.1 50.1 53.3 53.9 57.7 61.5 63.571.4 74.6
a
cde de
ef effg
g
aa
abcab
bcd cde
water average
Volume Median Diameter (VMD)
050
100150200250300350400450500
11004XR 11004TT TF 2 11003AI
Mic
rons
Water RWM + 2%AMSRWM + 1% AMS + Array RWM + 2% AMS + BorderRWM + 2% AMS + Placement
40 psi 40 psi 40 psi 70 psi
% less than 210 Microns
37 51 36 35 45 23 30 14 15 26 19 22 14 13 22 10 17 29 29 15
Bob Klein, U of Nebraska
Percent fines
Disclaimer:
• Brand names appearing in this presentation are for identification and illustration purposes only.
• No endorsement is intended, nor is criticism implied of similar products not mentioned.
