Sprayer Calibration

There are 3 factors to consider when calibrating your sprayer

1 - Gallons per acre to be applied (G.P.A.)
2 - Ground speed measured in miles per hour (M.P.H.)
3 - Row Spacing (Width of drive rows)

G.P.M. = G.P.A x M.P.H. x Row Space divided by 500

Example: you want to apply 50 gallons per acre to grapevines, at a speed of 3.0 M.P.H., and the distance of the drive rows is 9 foot.
50 times 3 times 9 = 1350 divided by 500 = 2.7 gallons per minute

Now look at the spray chart to determine the best way to apply 2.7 gallons per minute
You could use 10 (5 on each side) of the smallest spray tips (.8mm) at 10 bars of pressure (147 P.S.I.). Each tip produces .277 G.P.M., so 10 times .277 = 2.77

Or you might want to apply more at the top of the vine, a moderate amount at the center area, and less at the bottom. For this example we will only use 6 nozzles (3 on each side). [2] 1.2 mm tips in the top [2] 1.0 tips near the center and [2] .8 tips at the bottom. If you add up the output of these 6 tips at 15 Bar pressure (220 psi) you will get 2.73 gallons per minute.

You can use the formula in reverse to determine sprayer output. You are using 3 of the 1.2 tips on each side at 10 bars (150 pounds pressure). With 6 tips total you are putting out 3 gallons per minute. Multiply 3 gallons a minute times 500 = 1500 divided by 10 foot wide rows = 150 divide by 3 mph = 50 gallons per acre

In these examples I used a ground speed of 3 miles per hour. In reality people drive at different speeds, depending on terrain and safety factors.



Output per nozzle in gallons per minute (G.P.M.)

Nozzle output is at the intersection of nozzle size (top row) and pressure (L-side)

Using 2 hole restrictor- plate part number D138014


Nozzle size →
.8 mm C534039 1.0 mm C534047 1.2 mm C534043 1.5 mm C534044 1.8 mm C534060 2.0 mm C534045 2.3 mm C534061
Pressure ↓
5 bar (74 psi) 0.199 0.277 0.332 0.465 0.628 0.716 0.865
7.5 bar (110 psi 0.238 0.3365 0.4165 0.582 0.7235 0.836 0.979
10 bar (147 psi) 0.277 0.396 0.501 0.699 0.819 0.956 1.093
12.5 Bar (184 psi) 0.2935 0.436 0.54 0.7555 0.926 1.083 1.1515
15 bar (220 psi) 0.31 0.476 0.579 0.812 1.033 1.21 1.21
17.5 bar (257 psi) 0.3335 0.502 0.62 0.9125 1.111 1.305 1.3975
20 bar (294 psi) 0.357 0.528 0.661 1.013 1.189 1.4 1.585


To determine your ground speed

Mark 300 feet with flags at 0 and 300 foot marks. With a running start time the number of seconds from start line to finish line.

Seconds M.P.H.

Seconds M.P.H.
51 4

77 2.65
52 3.92

78 2.62
53 3.85

79 2.58
54 3.78

80 2.55
55 3.71

81 2.52
56 3.64

82 2.49
57 3.58

83 2.46
58 3.52

84 2.43
59 3.46

85 2.4
60 3.4

86 2.37
61 3.34

87 2.34
62 3.29

88 2.32
63 3.24

89 2.29
64 3.19

90 2.27
65 3.14

91 2.24
66 3.09

92 2.22
67 3.04

93 2.19
68 3

94 2.17
69 2.96

95 2.15
70 2.91

96 2.13
71 2.87

97 2.1
72 2.83

98 2.08
73 2.79

99 2.06
74 2.76

100 2.04
75 2.72

101 2.02
76 2.68

102 2
Back
Copyright © 2017 Leinbachs Inc. Powered by Zen Cart