Calibration - Cushman Spraytek DS175 Safety & Operation Manual

6 SPRAYER OPERATION
6.6

CALIBRATION ____________________________________________________________

Practice with water - after you have followed all
recommendations, it is advisable to familiarize yourself
with the operation of the dedicated sprayer and sprayer
package. Practicing with plain water before the addition
of expensive and potentially destructive chemical
formulas (when mis-applied), can be smart and cost
effective.
To spray and spray accurately, you must have a set
standards to spray by.
The easiest method of calibration is to use as many fixed
constants that can be controlled, and then modify the tip
size & out-put pressure to lock in your desired application
rate.
When using the following formulas, the application rate
can be maintained by fixing the constants for each
category.
To properly calibrate
information is required.
Desired Application Rate - GPA (Gallons Per Acre) or
2
G/1000 ft (Gallons per 1000 square feet).
Nozzle Spacing - Distance in inches between spray tips.
Desired Ground Speed - A fixed, ground speed is
recommended to maintain accurate calibration.
Tip Style - Type of pattern for particle distribution of
applicable chemical to be applied, i.e. (FL, XR, TT).
Tip Size - Determines volume per minute, per nozzle and
desired droplet (micron) size of spray carrier particles.
28
the sprayer, the following
The following Formulas and conversion factors will help
you obtain the necessary information.
Abbreviations:
km - kilometer
m - meter
G - Gallon
l - Liter
GPA - Gallons per Acre
GPM - Gallons per Minute
MPH - Miles per hour
PSI - Pounds per square inch
W - Nozzle spacing in inches
Conversion Factors:
2
One Acre = 43,560 ft = 43.56 1000 ft
One Hectare = 2.471 Acres
One GPA = 2.9 Fluid Ounces/1000 ft
2
One G/1000 ft = 43.56 GPA
One Gallon = 4 Quarts = 8 Pints = 128 fluid ounces
One Gallon = 3.79 l = 0.83 Imperial Gallons
One Mile = 5,280 ft = 1.61 km = 1610 m
One PSI = 0.069 bar = 6.896 kilopascal
Fomulas:
GPM (per nozzle) = (GPA x MPH x W) / 5,940
GPM (per nozzle) = (G/1000 ft
GPA = (5,490 x GPM (per nozzle)) / (mph x W)
2
G/1000 ft = (136 x GPM (per nozzle)) / (mph x W)
2
= 0.405 hectares
2
= 9.35 l/hectares
2
x MPH x W) / 136