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7. CALCULATING "RATE 1 AND RATE 2 CAL"
LIQUID APPLICATIONS
Determine the application rate at which your chemical should be sprayed. Consult with your Dealer
to ensure your spray nozzles are capable of applying at this rate. In determining which spray nozzles
to use with your sprayer, you must know:
1) Nominal Application Pressure ___ PSI [kpa]
2) Target Application Rate ___ GPA [lit/ha]
3) Target Speed ___ MPH [km/h]
4) Nozzle Spacing ___ inches [cm]
From this information, calculate the volume per minute, per nozzle as follows:
GPM [lit/min] =
GPA [lit/ha] x MPH [km/h] x inches [cm]
5,940 [60,000]
EXAMPLE: 1) Application Pressure =
30 PSI
2) Target Application Rate = 20 GPA
3) Target Speed = 5.2 MPH
4) Nozzle Spacing = 20 inches
GPM = 20 GPA x 5.2 MPH x 20 inches = .35
5,940
Using GPM .35 and pressure 30 you would select tip number XR8004 from the chart below, since it comes
closest to providing the desired output.
VERIFYING FLOW RATE LIMITS:
The flow rate of spraying must be within the range of that specified for the Flow Meter included.
FLOW METER MODEL FLOW RANGE
RFM 5 0.05-5 GPM [0.2-18.9 lit/min]
RFM 15 0.3-15 GPM [1.1-56.8 lit/min]
RFM 55/55A 1-55 GPM [3.8-208 lit/min]
RFM 100 3-100 GPM [11.4-379 lit/min]
RFM 200/200 Poly 15-200 GPM [56.8-757 lit/min]
RFM 400 25-400 GPM [94.6-1514 lit/min]
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