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Flow Meter ali ration
If the sprayed volume from the controller does not
match the tank volume that was sprayed out, then
the flow meter will need to be checked and a new
updated figure input into the ' eter Cal' in the Raven
controller.
On the flow meter on the sprayer, there will be
a calibration number attached to it on a white
sticker. The number that is applicable is the one
in square brackets, i.e. [185]. Note this number
down as this is the number that should be
entered as the 'Meter Cal' number.
The flow meter should be checked at the start of
every spraying season and periodically during the
season.
• The simplest way to check the accuracy of the
flow meter is to fill the tank to a previously
determined volume mark usually top fill marking .
while making sure the tank is level.
• On the Raven controller, make sure the 'Total
Volume' reads '0'.
• Perform a self test, choose a high speed and high
rate so that the tank will empty relatively quickly
but make sure the pressure does not exceed 60
PSI.
• When the tank is empty, on the Raven controller
press 'Total Volume' to read what the Raven
flow meter has output to the boom. Record the
reading.
• Check the volume of the tank to see what has
been sprayed out to the boom. Record the
reading.
• Compare the reading from the controller with
the known volume from the tank. If there is a
relatively large discrepancy (i.e. more than 50 litres
out of a 3
be removed from the sprayer, disassembled and
the condition of the turbine checked and cleaned.
It should be able to spin freely.
The flow meter should then be reassembled and
replaced on the sprayer. Perform the volume
check again and if there is still a discrepancy, the
'Meter Cal' value can be changed
i.e. If volume from the controller reads 3100 litres
instead of 3000 litres and the original Meter Cal
value is 185, then:
20 - Chapter 6 - Calibration
litre tank , the flow meter should
a en
New 'Meter Cal' value = (185 x 3100) / 3000 = 191
Every sprayer should be calibrated regularly to
ensure minimal error in the application rate. A nozzle
selection chart indicates what application rates
are to be expected. Variations due to nozzle wear,
ground speed error and pressure irregularities can all
add up to result in large application rate errors.
Prairie Pro Operator's Manual MY19 - REV 2
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