One of the easiest ways to increase efficiency and yield outcomes is to learn how to perform spray tip calibration on your spray system. Researchers estimate that inaccurate sprayer settings cost farmers on average $2 per acre of application, and are a leading cause of profit losses that can be easily avoided. By calibrating the spray tip before the first application, farmers can save costs on pesticides, herbicides, and fertilizers, and increase crop viability. 

Factors Impacting Spray Tip Accuracy

Several factors impact the accuracy of spray tip delivery, and may require recalibration. Any time you change the nozzle type, speed, pressure, or application device, the application rate will change, and the tip will need to be recalibrated. Temperature and frequency of tip use may also impact tip accuracy. Spray tips and nozzles wear out over time which may result in overapplication of chemicals, or plugged nozzle tips. Always clean all nozzle tips and assess their quality before calibrating. 

Spray Tip Calibration One thing is that the orifice size is based on GPM(gallons per minute) at 40psi i find the easiest way to calibrate a nozzle is by using a calibration jug or by using the Spot On Tip Calibrator and a stopwatch. 

for example a tip would be a XR11006 which means that it would have 0.6 GPM at 40psi at the individual tip, most spray controllers have a manual mode, so set the pressure to 40psi on the controller and time for one minute with the jug or Spot On Tip Calibrator under the nozzle, then if it is within 5% you have a good nozzle.

Spray tips can be calibrated in several simple ways, based on recorded measurements of travel speeds, nozzle output, and distance between nozzles. Follow the instructions below for a simple seven-step method to calibrate your spray tips:

1. Clean your spray tank and nozzle. Fill your clean spray tank at least half-full with water. 

2. Measure the distance between spray nozzles and calculate the appropriate driving distance to time your travel speed. The appropriate distances for different nozzle spacings are 408 ft for a 10-inch spacing, 291 ft for a 14-inch spacing, 204 ft for 20-inch spacing, 136 feet for a 30-inch spacing, and 102 feet for a 40-inch spacing.

3. Use a stopwatch to track the time it takes to travel this distance in the field. 

4. Collect a sample from each output nozzle tip while the sprayer is stationary. Collect the sample for the same number of seconds that it took to drive the given distance. Allow the foam to settle and measure the volume in order to determine the gallon-per-acre rate.

5. Compare the output measurements of each nozzle. If there are any inconsistencies, address that nozzle to ensure that it is not plugged or damaged. Repeat step five until nozzle outputs are consistent. 

6. The average nozzle output in ounces is equal to the application rate in gallons per acre. Calculate the average nozzle output in ounces.To do so, add the volume collected by the individual nozzles, and divide by the number of nozzles tested. The final figure will be your application rate in gallons per acre. 

7. Compare your test results with the manufacturer’s recommended rate. You will need to make adjustments to spray pressure or travel speed and repeat steps 2-6 if the actual rate is greater than 5% higher or lower than the recommended rate.

8. When you are content with your outcomes, set the boom to the appropriate target height, and continue spraying.

After calibrating your spray tips, you will notice a profound difference in spray system performance. Successful calibration ensures the efficiency of product application, increased profits, and an overall more enjoyable spraying experience!