PWM systems have been in operation since the early 1990’s and operators have come to understand the strengths and limitations of the system.  

The ability to maintain spray quality by controlling flow rate independent of pressure was a big step forward for spraying technology.  

Perhaps a greater impact of PWM on spraying is the ability to control flowrate at the nozzle, which allows for turn compensation, single nozzle section control and variable rate application by each nozzle.  

While newer PWFM systems have the potential to increase the level of precision and uniformity available, the operator can still impact the quality of each spray job through nozzle choice, operating pressure, boom and nozzle height and travelling speed.