Smithco Envizio Pro Installation & Operation Manual - Manual (Page 190)

Appendix A
180 Envizio Pro and Envizio Pro II Installation and Operation Manual
Dead Band Digit
The Dead Band digit is the allowable difference between the target rate and the actual application rate. The
values range from 1 to 9, where 1 equals 1% difference and 9 equals 9% of the difference.
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 = =