Appendix A: Broadcast Spray Calibration Tables - North Star M2827271A Owner's Manual

Appendix A – Broadcast Spray Application Tables
Below are some guidelines to calibrate a North Star boom sprayer with DT3.0 (777359)
spray nozzles. This is a very important step in operating the boom sprayer so the right
amount of chemical is applied.
1. Use the suggested application rate from the chemical manufacturer (i.e. gallons per Acre,
1000 sq.ft., or 100 sq.ft.)
2. Using Table 1, find the application rate that most closely matches the chemical
manufacturer's suggested application rate and pressure at which the sprayer is operating.
3. Follow this application rate up the chart to find the speed at which to drive the vehicle.
Spray Pressure
Height (PSI)
32"
20
32"
30
32"
40
Spray Pressure
Height (PSI)
32"
20
32"
30
32" 40
Spray Pressure
Height (PSI)
32"
20
32"
30
32"
40
* Approximate flow from one nozzle
4. Use Table 2 to choose the throttle setting on the vehicle.
Speed
(MPH)
1
2
3
4
5
7
5. The coverage area can be found by dividing a full tank (ie; 55 gals) by the application rate.
Example: 55 gallons divided by 15 gallons/acre = 3.67 acres of coverage per tank.
TABLE 1
Flow GALLONS PER ACRE -
(GPM) 1 MPH 2 MPH
1.7* 56
2.0* 66
2.5* 82.5
Flow GALLONS PER 1000 SQUARE FEET
(GPM) 1 MPH 2 MPH
1.7* 1.29 .64
2.0* 1.52 .76
2.5* 1.90 .94
GALLONS PER 100 SQUARE FEET –
Flow
(GPM) 1 MPH 2 MPH
1.7* .129 .064
2.0* .152 .076
2.5* .190 .094
TABLE 2
Time required in seconds to travel a distance of:
100 ft.
68
34
23
17
14
9.5
based on 32 foot spray pattern
3 MPH 4 MPH
28 19 14
33 22 16.5
41 27.5 20.5
3 MPH 4 MPH
.44 .32
.51 .38
.63 .47
3 MPH 4 MPH
.044 .032
.051 .038
.063 .047
200 ft.
136
68
45
34
28
19
36
5 MPH 6 MPH 7 MPH
11 9
13 11
16.5 13.5
– based on 32 foot spray pattern
5 MPH 6 MPH 7 MPH
.25 .21
.30 .25
.38 .31
based on 32 foot spray pattern
5 MPH 6 MPH 7 MPH
.025 .021
.030 .025
.038 .031
300 ft.
205
102
68
51
41
29
8
9.5
12
.18
.22
.28
.018
.022
.028