boom sprayer

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This method of calibration is very easy and can be used to check and fine-tune a sprayer quickly, but it does require driving a distance in the field. Before calibrating the sprayer with any method, you must check nozzle output for uniformity. Correct any nozzles that vary in flow rate by more than ±5 percent. Also check that the pressure gauge is reliable and the pressure is properly set. Then proceed as follows:

For broadcast application, determine the distance, in inches, between nozzles. For banded applications, determine the band width in inches. For directed applications, collect the discharge from all nozzles per row.
From the table, determine the distance needed to equal 1/128 acre. Mark this distance off in a field you will be spraying.
Measure the time (in seconds) needed to drive the required distance at normal operating speed with all equipment attached and the spray tank 1/2 full.
Collect the discharge from all nozzles directing spray to one row for the time measured in step 3. All chemical added together in ounces is gallons per acre. If broadcast spraying is being done, the ounces collected from one nozzle is gallons per acre.


Table - Calibration distance, ounces to gallons, 1/128 acre.

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Nozzle Spacing Course Distance
or Band Width (inches) (feet)
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8 510
10 408
12 340
14 291
16 255
18 227
20 204
22 185
24 170
26 157
28 146
30 136
32 127
34 120
38 107
40 102
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