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5. CALCULATING "RATE CAL" (LIQUID APPLICATIONS)
Determine the application rate at which chemical is to be sprayed. Consult with a dealer to ensure
these spray nozzles are capable of applying at this rate. In determining which spray nozzles to use
with the sprayer the following must be known:
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 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 60P 1-60 GPM [3.8-210 lit/min]
RFM 100 3-100 GPM [11.4-380 lit/min]
RFM 200/200 Poly 15-200 GPM [56.8-760 lit/min]
RFM 400 25-400 GPM [94.6-1515 lit/min]
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