Manual No. 016-0171-122 Rev. I 241
Flow Meter Recalibration
The calibration value for the specific flow meter is printed on the tag attached to the flow meter and will typically
provide accurate metering of product application. The following procedure may be used to check the meter
calibration or recalibrate the flow meter.
Note: Performing routine maintenance is recommended to help extend the service life and accuracy of
the flow meter. Review the Flow Meter Service and Maintenance section on page 240 to service
the flow meter as necessary.
Before calibrating the flow meter:
1. It is recommended to perform the flow meter calibration with clean water only. Clean out the supply tank
and flush the product lines with clean water. Refill the tank with clean water.
2. On the field computer, verify any active jobs are closed.
3. Toggle all boom section switches and the master section switch to the off position.
4. Disconnect one of the section product lines near the spray tips.
5. Set up a calibrated catch container (i.e. 5 gallon [19 L] bucket and place the disconnected end of the
product line in the container.
To recalibrate the flow meter:
1. On the field computer Home screen, touch the Tools Menu icon.
2. Select the Product Control icon from the System menu.
3. On the Product Control Configuration screen, touch the Calibration Settings button.
4. Select the Meter Cal value and use the on-screen keypad to enter a value of 10 [38].
5. Touch the Accept icon until the Product Control Configuration screen is displayed.
6. Touch the Volume/Area Settings button.
7. Touch the Total Volume button and use the on-screen keypad to enter a value of 0.
8. Touch the Accept icon to return to the Volume/Area Settings screen.
9. While monitoring the Total Volume on the screen and the container, toggle the master switch and the
appropriate section switch to the on position.
10. Dispense exactly 10 gallons [38 L] through the flow meter as measured by the calibrated catch container.
Important:Do not rely on graduation markings/numbers molded into the applicator tank.
11. Toggle the section or master switch off.
12. Read the value displayed on the field computer Total Volume button. This value should be within ± 3% of
the meter cal value printed on the flow meter tag.
13. To confirm accuracy, reset the Total Volume to 0 and repeat the above process several times. Always ‘zero
out’ the Total Volume display before toggling the section switch on.
Note: The above process is usually sufficient to check the flow meter calibration. For best results, set the
Meter Cal value to 100 [378] and repeat the above procedure to dispense exactly 100 gallons [378
L] through the flow meter.
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