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Sprayer Calibration
The sprayer calibration procedure will ensure
the sprayer pump is set properly. The reel speed
and conveyor dials are adjusted so that the
sprayer pump will only output the required rate for
the application.
Perform this procedure at the
beginning of each season and when changing
nozzle tips. This procedure can also be used to
identify tip wear and replacement.
WARNING:
procedure when the spray system has
been rinsed clean.
water to fill the tank and perform the
procedure.
To reduce the risk of chemical
contamination,
always
protective equipment and take the same
precautions that are required when handling
chemicals and preparing to do an application.
Make several copies of this page.
copy each time you perform a sprayer calibration
and include it in your records.
space for calculations and notes. You will need a
calculator, stopwatch, cleaning brush, measuring
container, and one new tip with a new screen.
1. Record the following information.
Date
Nozzle Manufacturer
Nozzle Type
Recommended
Application Rate (A)
(from chemical manufacturer's label)
Nozzle Spacing (B)
OPERATION
Only
perform
this
Use only clean
wear
the
same
Use a
Use the empty
(all nozzles must be identical)
USGPA
inches
2. Check windrower speed.
Perform this check to verify the DICKEY-john
Radar velocity is sensor is accurate in the field.
The sprayer speed should be calibrated in the field
when the tank is ½ to ¾ full of water. Record the
time it takes and the distance in the blanks below.
If you are confident the Radar sensor is accurate,
record the desired speed in the blank (C) and
proceed to the next step.
Distance Traveled
Time Taken
Calculate the true ground speed using the
following equation.
Speed
(mph)
True Ground
Speed (C)
IMPORTANT: The tractor must be traveling at
the desired speed at the starting point before
timing begins.
Calculate the speed or use the chart below to
match the time it takes to travel a specific distance
over your field with the true ground speed.
Time required in SECONDS to Travel
Speed in mph
(Miles per Hour)
3.0
3.5
4.0
4.5
5.0
6.0
7.0
7.5
8.0
9.0
36
seconds
Distance
(feet)
x
60
=
Time
(seconds)
x
88
a Distance of:
100 Feet
200 Feet
300 Feet
23
45
20
39
17
34
15
30
23
27
-
23
-
19
-
18
-
17
15
-
feet
mph
68
58
51
45
41
34
29
27
26
23
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