Miscalibrated equipment is one of the most common causes of poor results and phytotoxicity claims in the chemical application industry. Over-application wastes product and can burn lawns; under-application fails to deliver the promised results. A rigorous calibration protocol protects both your clients and your margins.
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Calibration Frequency and When to Check Mid-Season
All spray equipment should be calibrated at the start of each season and after any repairs, nozzle replacements, or pump service. Mid-season calibration checks are warranted if technicians report inconsistent coverage patterns, if flow rates seem off, or after equipment is involved in an incident. Scheduling calibration as a recurring task in your software ensures it does not get skipped during busy periods when errors are most costly.
The Output Test Every Technician Should Know
The catch-and-measure output test is the most reliable field calibration method for sprayers. Mark off a known area, spray it at normal walking speed, catch the output in a calibrated container, and compare the collected volume to the target label rate per thousand square feet. Repeat three times and average the results. Any variance greater than 10 percent from the label target rate requires a nozzle adjustment or pressure correction before the technician goes back to work.
Documenting Calibration Records for Compliance
Some states require or strongly recommend maintaining equipment calibration records as part of your overall pesticide application documentation. Even where not required, calibration logs demonstrate professional practice during regulatory inspections and can be critical evidence if a client claims damage caused by over-application. Log the date, equipment ID, calibration results, and the technician who performed the check in your software so records are searchable and permanent.
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