DirectCommand® ISOBUS Liquid Flow Meter Calibration
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In this tutorial, we will enter the manual
calibration for a flow meter and learn how to calibrate it using the nozzle catch test
in the DirectCommand® ISOBUS Liquid Control Module. Calibrating the flow meter based on the factory
tag is a good start, but performing a nozzle catch test calibration will ensure that products
are applied with the correct rates. The actual flow meter calibration accounts
for worn nozzles or leaks in the system that affect the flow rate.First, make sure the
DirectCommand ISOBUS Liquid sprayer profile is active in Universal Terminal. Access the calibrations menu by tapping the
gear icon. The Red “X” indicates that the flow sensor
is not calibrated so we’ll tap the flow sensor to see the calibration options. There are four methods of calibrating the
flow sensor: Manual, Nozzle Catch Test, Static Dispense Volume, and Field Dispense Volume
and we will cover the first two methods in this tutorial. Manual calibration, requires the flow meter
calibration value printed on the side of the flow meter. With manual calibration selected, tap the
next arrow. Here we will enter the value found on the
flow meter tag. It is important to recognize that the DirectCommand®
ISOBUS Liquid Module requires a value entered in pulses per gallon, but some manufacturers
supply their calibration number in different units. For example, Raven flow meters have their
calibration value listed in pulses per 10 gallons, so we would divide that tag number
by 10 before entering it in the display. The Raven flow meter on our example sprayer
has 720 pulses per 10 gallons written on the tag. So after dividing by 10, we will enter a calibration
number of 72 pulses per gallon. Tap the next arrow. Verify that the displayed value is correct
and is properly converted to pulses per one gallon. Tap the green check. Notice that the Red “X” on the flow sensor
has changed to a Green Check, indicating that it is now calibrated. Now we will perform the nozzle catch test
calibration to verify the actual flow rate matches the display readings. In this method, we will catch the liquid from
a single nozzle in a container and measure the total volume dispensed. To begin, tap the flow sensor button and then
select Nozzle Catch Test from the drop down. Tap the next arrow. To dispense liquid while the sprayer is not
moving, a simulated ground speed and a target rate will need to be entered. We recommend using a ground speed and target
rate that the applicator will actually be applying product in the field. For our example, we will enter 8 miles per
hour and 12 gallons per acre. Make sure a container is positioned to collect
product from a single nozzle and tap the start button. Product will begin dispensing and the display
shows the running time and accumulated pulses. You could tap Stop at any time, but to simplify
the math we suggest collecting product for one minute. When the running time reaches 60 seconds,
tap the stop button. We need to measure the volume of product dispensed
into the container. In this scenario, the machine dispensed 0.30
gallons. Since we collected product for one minute,
we will enter the observed flow rate of 0.30 gallons per minute. Product should be dispensed for a minimum
of one minute but can be dispensed for a longer period. When using a longer time, the total volume
must be divided by the total time to get a value in gallons per minute. Tap the next arrow. The new, adjusted calibration value is displayed. To save and complete the calibration, tap
the green check. You can repeat the calibration by tapping
the flow sensor button if you like to use a different nozzle to verify multiple nozzles
across the boom. Now you will be able to calibrate a flow meter
using the Manual and Nozzle Catch Test methods. For more information on the DirectCommand®
ISOBUS Liquid Rate Module, please refer to the DirectCommand® ISOBUS Liquid Feature
User Guide. If you’d like to see more short tutorials
from Ag Leader, please subscribe to our YouTube channel.

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