Appendix A
196 Envizio Pro™ and Envizio Pro II® Installation and Operation Manual
Rate Cal
The following information must be known in order to determine which spray nozzles to use with the sprayer.
• Nominal Application Pressure_________ PSI [kpa]
• Target Application Rate_________ GPA [lit/ha]
• Target Speed_________ MPH [km/h]
• Nozzle Spacing_________ inches [cm]
From this information, calculate the volume per minute per nozzle as follows:
where NVPM = Nozzle Volume per Minute (Gallons/Acre or [lit/ha]), Rate = Target Application Rate, Speed =
Target Speed of Application and NS = Nozzle Spacing.
For Example:
Application Pressure = 30 PSI, Target Application Rate = 20 GPA, Target Speed = 5.2 MPH and Nozzle
Spacing = 20 inches
Using the calculated Nozzle Volume per Minute of 0.35 at an Application Pressure of 30, select a tip that is
capable of these application specifications. Contact a local sprayer supply dealer for available nozzles or
spray tips.
Verifying Flow Rate Limits
The target rate for a field application also must be within the specified range of the flow meter measuring flow
rate for the control channel.
Flow Meter Model Flow Range
RFM 5 0.1 - 5 GPM [0.2 - 18.9 L/min]
RFM 15 0.3 - 15 GPM [1.1 - 56.8 L/min]
RFM 60P 1 - 60 GPM [3.8 - 210 L/min]
RFM 100 5 - 100 GPM [11.4 -380 L/min]
RFM 200/ 200 Poly 15 - 200 GPM [56.8 - 760 L/min]
RFM 400 25 - 400 GPM [94.6 - 1515 L/min]
NVPM
Rate Speed× NS×
5 940 60 000,[],
-----------------------------------------------
=
NVPM
20 5.2× 20×
5 940,
------------------------------- -
0.35==
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