What aspect of ULV sprayers is not guaranteed for life by the manufacturer?

The flow rate of a single insecticide in ULV (Ultra Low Volume) sprayers is subject to variability based on several factors, including the specific formulation of the insecticide, the conditions under which the sprayer is operated, and the maintenance of the equipment itself. Unlike more stable components, such as cylinder pressure control or voltage stability, which are tightly monitored and controlled by the manufacturer, flow rates can change over time due to wear, clogs, or inconsistencies in agent viscosity. Therefore, manufacturers typically do not guarantee a fixed flow rate for the duration of the sprayer's life.

In contrast, cylinder pressure control ensures a consistent pressure delivery which is crucial for the proper functioning of the system and is therefore assured by the manufacturer. Droplet size consistency is also typically guaranteed as it is essential for effective pesticide application, ensuring that droplets stay within a specified range to maximize efficacy while minimizing drift. Likewise, voltage stability is a critical factor for the operation of many electric sprayers, and manufacturers pledge reliability in this area as well. These aspects are more easily controlled and maintained, while the flow rate can be influenced by external conditions and usage patterns, leading to its variability.