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3. Using a stopwatch or a watch with a sweep second hand, determine the
flowability time in seconds that it takes for the liquid level to fall from the top
line to the bottom line.
Once the flowability of the liquid has been measured, tables on next page can be
used as an approximate guide for setting the pump flow rate and nozzle boom
pressure for your spray application, taking into account the expected Droplet size.
NOTE:
Periodically calibrate the flowability meter using plain water. Water should
flow through the orifice such that the time between the top line and the bottom line is
32 + 2 seconds.
CAUTION
Follow all warnings and cautions on your formulation label. Do not attempt to apply
any formulation at a rate greater than what is specified on the formulation label. This
includes driving your vehicle at a rate slower than what is specified.
CAUTION
The rates on the next page are examples of typical application rates found on their
respective formulation labels. Refer to the label of your formulation to determine the
actual application rate before calibrating your machine to any of the above flow rates.
Once the flowability of the formulation to be sprayed has been determined and the
formulation pump has been calibrated select one of the tables (next page) that is
closest to the flowability of the formulation to be sprayed. Then match the closest
flow rate in the left hand column with the flow rate specified on the formulation label. A
boom pressure can then be selected that will produce a particle size in accordance
with the formulation label. Remember, with a constant flow rate supplied to the nozzle
system, increasing nozzle boom pressure will decrease particle size.
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