Sprayer Calibration Guide

For 1 Gallon Spray Solution.

1. Select the proper equipment to get the job done.

2. Do not use pesticide during calibration. A spray colorant is recommended to aid in determining spray pattern, droplet size, coverage and pressure.

3. Calibrate properly and check calibration periodically. Calibration of Backpack, Hand Can Sprays and Shower Head Type “Guns” (Broadcast Application) Flat fan nozzles and shower head guns are generally used in broadcast applications.

A. Measure a 20′ by 50′ area or 1,000 sq. ft.

B. Fill the sprayer with water (and optional spray colorant) to a known mark.

C. Spray the 1,000 sq. ft. area.

1. Keep walking speed and pressure constant. Use of the colorant will show light, heavy or skipped areas of application.

D. Measure the amount of water required to refill the sprayer to the known mark. This is the spray volume per 1,000 sq. ft.

E. The amount of pesticide to be added to 1 gallon of water can now be determined using the following formula:

Example 1:
The pesticide label rate is 1.2 ounces/1,000 sq. ft. The spray volume is 0.5 gallons/1,000 sq. ft.

Example 2:
The pesticide label rate of 1.5 ounces/1,000 sq. ft. The spray volume is 2 gallons/1,000 sq. ft.