When calibrating liquid hand sprayers, which practice is recommended?

When calibrating liquid hand sprayers, which practice is recommended?

• A. Hold nozzle at consistent height while spraying
• B. Spray back and forth in swaths, walking at even pace
• C. Increase spray speed when turning corners
• D. Keep the nozzle close to the ground

Answer: (A)

Maintaining a constant nozzle height during calibration is critical because how much liquid lands on the test surface and the spray pattern depend on the distance from the nozzle. If you move the nozzle up or down, the swath width and the amount deposited per unit area change, making the measured output unreliable. Calibration measures volume delivered over a known area, so a fixed height keeps the results repeatable and accurate. While steady movement and even pacing help with applying, they are not the core requirement for calibration; varying height is what most directly disrupts accurate measurement. Keeping the nozzle very close to the ground would distort the pattern and introduce inconsistency into the calibration.

Maintaining a constant nozzle height during calibration is critical because how much liquid lands on the test surface and the spray pattern depend on the distance from the nozzle. If you move the nozzle up or down, the swath width and the amount deposited per unit area change, making the measured output unreliable. Calibration measures volume delivered over a known area, so a fixed height keeps the results repeatable and accurate. While steady movement and even pacing help with applying, they are not the core requirement for calibration; varying height is what most directly disrupts accurate measurement. Keeping the nozzle very close to the ground would distort the pattern and introduce inconsistency into the calibration.