Demco TRUSS-T BOOM 21, Operator'S Manual

Page: 12 / 20

Page 12 AB20002
Calibrating the Sprayer
1. Mark off 660 feet (1/8 mile).
2. Fill the tank with water.
3. Set the sprayer to your desired operating pressure.
4. Turn the sprayer on and drive at the constant speed you will be spraying. Calibration on a road or unplowed field will
give different results than on soft cultivated ground.
Note tachometer reading so same speed can be maintained
later.
5. Measure the amount of water it takes to refill the tank completely.
6. Calculate the amount applied:
Number of gallons used x 66 (factor) Gallons applied
=
Spray Swath in Feet per acre
Example: If 10 gallons are used in 660 feet and the spray swath is 28 feet, spraying rate is 23.57 gallons per acre.
10 x 66 660
= or 23.57 gallons per acre
28 28
7. To calculate the amount of chemical to put in the tank:
Sprayer Tank Size Acres
= then;
Desired GPA covered
Recom. amount of chemical Acres Amt. of chemical
x
per acre covered per tankful
Example: If a 300 gallon tank is used and 23.57 gallons per acre are applied, one tank will cover 12.72 acres. If three
pounds of chemical are required per acre, then 38.1 pounds of chemical are required per tankful.
300
= 12.72 acres covered then;
23.57
3 lbs. (gal.) x 12.72 = 38.1 lbs. (gal.) per tankful
NOTE: To avoid wind drift, use lower pressure and higher spray volume.
Guidelines For Sprayer Calibration
Before calibrating your sprayer, first determine whether each nozzle is delivering at a uniform rate. Place quart jars under
all nozzles and watch as they fill up. The level should rise uniformly and take the same time (within 10%) for all nozzles to
fill the jars. Replace any nozzle showing a discharge rate different from the others.
Sprayer Multiply by
Speed Speed Factor
4 mph 1.25
5 mph 1.00
6 mph .83
7.5 mph .67
10 mph .50
To determine GPA at other nominal speeds.
CALIBRAtIoN
sPRAYER CALIBRAtIoN PRoCEDuREs