Calibration of

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Calibration of Right of Way Sprayers Backpacks
Paul E. Sumner Extension Agricultural
Engineer University of Georgia Cooperative
Extension Service Tifton, GA
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Incorrect Plumbing
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AGITATION
Sparge Tube
Mechanical
Jet or Venturi
5 to 7 gpm/100 gallons
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Weed Seeker
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BOOMLESS NOZZLES
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Boom Buster
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Radiarc
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Swath width Radius Pattern 5' - 25' -- Diameter
Pattern 10' - 40'Swath width can be varied by
spray pressure, mounting height and mounting
angle.
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RADIARC VOLUME CAPABILITIESAND ORIFICE /
DROPLET SIZE RELATIONSHIPS
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Norstar
Chemical Injection
"Nutating" spray heads
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Excellent low drift option while extending
spray reach Large droplet size reduces spray
drift and promotes spray penetration Maintains
a consistent spray swath of 15-20 feet over a
pressure range of 30-60 psi Precision molded
polyacetal tip provides excellent life and low
maintenance Can be used with manual or
automatic rate controllers Standard series
available with easy-to-install standard male pipe
threads and precision molded polyacetal tip and
stainless steel body to provide excellent
durability and low maintenance FastCap design
includes tip, cap and gasket for fast change out
and safer handling
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Be Careful
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Electronics/Rate Controllers

• Compensates for speed change
• Maintains a log of spray applications

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Volume Output Calibration Calculator Method
Salmon Color Sheet
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-Fill Sprayer (level ground) -Operate Sprayer
(Measured Time) -Measure the water required to
refill sprayer -Measure ground speed
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Calibration Variables

• Nozzle flow rate (GPM)
• Ground speed (MPH)
• Effective sprayed width (W)

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Gallon per Acre Equation
GPM
495
x
GPA

MPH
x
W
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Where
Gallons per acre
gallons per acre

• GPA ______________________
• GPM ______________________
• MPH ______________________
• W ______________________
• 495 a constant to convert gallons per minute,
  miles per hour, and feet to gallons per acre

gallons per minute
Gallons per minute
miles per hour
nozzle spacing - feet
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85-95 of wetted swath
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MEASURE SPEED
(1 MPH 88 Feet traveled in 60 seconds)
Measure the ground speed in an area similar to
the conditions of the area to be sprayed!
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CALIBRATION
1/128 Acre Nozzle Output Method
Yellow Sheet
1/128 of an acre 340.3 ft2
Calibration Distance is multiplied by 10
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20 feet spray swath
170 feet calibration distance
Note Time In Seconds
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- Set RPM - Adjust Pressure - Collect from Nozzle
Ounces Collected divided by 10 GPA
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Pressure
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Guns and Backpack Sprayers
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CF Valves Control Flow Valves
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Hand Piston Hand Diaphragm Electric
Pump Internal Combustion Pump
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Spray Guns and Backpack CALIBRATION

• 1/128 Acre Nozzle Output Method (White Sheet)
• 1000 ft2 Method (Blue Sheet)
• Tank Mix Percent by Volume (Green Sheet)

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Calibration For Hand Spray Guns 1000 ft2 Method

• A spray gun has a swath of 10 ft. For uniform
  distribution of spray use 100 overlap. This
  creates an effective width of 5 ft.

Step 1
Mark off a calibration course of 1000 sq. ft.
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Hand Spray Guns, cont.
Step 2

• Accurately measure the time required to spray
  the calibration course using a proper technique.
  Remember only record the amount of time the gun
  is actually spraying.

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Step 3
Measure the flow rate from the gun. Using the
time recorded in Step 2 collect and measure the
output from the gun in a graduated container for
the period of time in Step 2.
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Hand Spray Guns cont.

• Example
• It took 50 seconds for an applicator to spray the
  1000 sq. ft. calibration course. The amount of
  spray collected from the gun in the 50 seconds
  was 1.4 gallons.

The application rate for this example is 1.4
gallons per 1000 sq. ft. Or (43,560 sq.ft./acre
x 1.4 gal/1000 sq.ft.) 61 gallons per acre
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Hand Sprayer Calibration Percent by Volume Method
Dilute

• product added to each gal. or 100 gal. (
  according to label)
• uniform coverage
• time and gallons per 1000 sq. ft.

Technique important!!
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Thank You