Calibrating Sprayer - AG SPRAY MC2 Series Owner's Manual

When spraying with a boom, the sprayer must be calibrated to ensure proper spray coverage and to combat over-application or
under application. Before calibrating the sprayer, it is important to familiarize yourself with the operating instructions.
The calibration process is simplified when broken down into the following three steps:
1. Determine the speed of the tractor
2. Determine the nozzle size and use the calibration chart to find the correct pressure setting
3. Set the pressure accordingly using the pressure regulating valve
Note: All calibration must be done with clean water only!
1. Determining the Speed
It is important to determine what speed the tractor will be traveling at, while spraying. While some tractors have speedometers, it
is still recommended that speed is calculated for all tractors for accuracy purposes. To determine the speed follow these steps:
1. Set the tractor throttle to operate between 75%-100% of the tractor's RPM range. This will allow the pump to operate at full
volume
2. Measure a 200 foot or 300 foot distance on a field or a surface similar to where you will be spraying
3. Drive the tractor and sprayer (tank half-full is optimal) across the measured distance at a constant rate of speed. There should
be no changes in speed while you are measuring the time. This should be a comfortable speed for spraying
4. Have someone measure the amount of time (in seconds) it takes to travel the measured distance
5. Your speed can be found by entering your data into the equation below or by consulting the speed table
Speed (MPH) = (Distance (FT) x 60)/(Time (Seconds) x 88)
_____(MPH) = _____(FT) x 60/ _____(SEC) x 88
Note:
When calculating tractor speed be sure to
select a gear that allows the tractor to operate be-
tween 75%-100% of the tractor's RPM range. This will
allow the pump to operate at full volume. Selecting a
higher gear will not allow the pump to work
efficiently.
Page 8
Calibrating the Sprayer
Note: it is helpful for future references to record the exact
RPM and gear that was used to attain the desired speed
Tractor RPM
___________
Speed in M.P.H.
(Miles Per Hour)
Tractor Gear =
___________
Speed Chart
Time Required in seconds
to travel a distance of
100 Ft.
1.0 68 sec.
2.0 34
3.0 23
4.0 17
5.0 14
6.0 11
7.0 9.7
8.0 8.5
9.0 7.6
10.0 6.8
Speed
_________________
200 Ft. 300 Ft.
136 205
68 102
45 68
34 51
27 41
23 34
19 29
17 26
15 23
14 20