Most Agricultural Knapsack Sprayers Do Not Have A Pressure Gaug

  •   The agricultural knapsack sprayer (hand pump, portable tank, and backpack) is designed for on-site treatment and used for spraying in smaller areas (such as saplings, small lawns, or flower beds) that are not suitable for powered sprayers. Like all sprayers used for chemical spraying, the spray accuracy of backpack sprayers and hand-held sprayers will be affected by travel speed, nozzle type, and spray pressure. Even after training and regular calibration, it is difficult to distribute spray evenly. The three rules of spraying accuracy apply to all spraying equipment used, including manual spraying machines:

      Maintaining a consistent walking speed is critical to maintaining a relatively uniform application rate throughout the operation. A higher travel speed will result in a lower application rate.

      Maintaining a uniform spray pressure is also essential for maintaining the application rate and the uniformity of the droplet size during application. Lowering the spray pressure will result in a higher application rate and larger droplets.

      Maintain the best spraying distance between the nozzle and the target.

      When using a manual sprayer, it is more difficult to keep the moving speed, pressure, and spraying distance at the optimal level ratio than an electric sprayer that moves at a set speed and has a set boom width. When using a manual sprayer, the travel speed may vary depending on the walking speed and physical strength of the sprayer (at the beginning of the working day or at the end of the working day) and the terrain of the area. Spraying (gradient, surface condition, etc.). A metronome or buzzer can help keep walking speed constant.

      Most agricultural knapsack sprayers do not have pressure gauges or pressure controllers. The pressure continues to drop during spraying. If the sprayer is not pressurized during the intermittent stroke of the pump, the pressure will drop, thereby reducing the application rate. Conversely, if the pump is over-pressurized, the application rate will be increased while producing smaller droplets that tend to drift. Both can lead to the waste of pesticides or poor control of pests.

      Finally, it is difficult to maintain a uniform nozzle height throughout the application process with a manual sprayer. Due to arm fatigue, it is likely that the nozzle height at the beginning of spraying is closer to the target than at the end of spraying. In order to maintain the uniform deposition of chemical substances on the target, the nozzle can be stably maintained at a constant height and moved back and forth, or the nozzle can be swung in a stable, sweeping, and overlapping manner.

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