Temporal precision of manometers in agricultural ground bar sprayer

The use of manometers in measuring fluid pressure in agricultural bar sprayers is fundamental as the spray pressure affects several characteristics such as the working range of the tip, the spraying volume, the size of the drop, the coverage on the target, the angle of the jet, the life of the drop and the risk of drift. The objective of this work was to measure the temporal accuracy of manometers in ground bar agricultural sprayer. Therefore, nine manometers were coupled to the bar of a ground sprayer. Every five hours of spraying the manometers were drawn from the spray bar and their accuracy was checked through a sealing gauge bench with a standard digital manometer. The digital standard manometer and manometer tested should indicate similar pressure. When the pressure difference exceeded 10%, in the range between 25 and 75% of the scale of the manometer in use in the bar, it was considered imprecise. After 15 hours of work, there began to be inaccurate gauges in the bar of the ground sprayer. With 30 hours of activity, all of the manometers tested were inaccurate.