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17.8.2 Flow Calibration for Balanced (Hardi) valves
Because the Balanced valve system used on Hardi Sprayers, the normal calibration procedure
cannot be used. The following procedure is required for a Balanced valve systems, but can
also be used on ‘normal’ valve systems.
1. Select Manual on the Sprayer switchbox, turn the pump on and all boom sections on.
2. Turn the Master ON, the sprayer should start spraying. Adjust the pressure to the
normal spraying pressure around the middle of the nozzle range.
3. Ensure ‘Display Volume/Nozzle’ is selected on the FLOW window, see Section 17.4. The
Flow Readout units will be ‘volume (L or Gal)/noz’. The value displayed in the Flow
readout window will be volume/nozzle/minute.
4. For this test to be accurate all nozzles on the boom spray must be the same type and
the nozzles must be in good condition (not worn). The flow meter should also be in
good condition for this test to be accurate.
5. Place a jug under a nozzle and time for 1 minute.
Measure the volume of liquid coming out of the nozzle, this is the ‘Actual’ amount.
Write the ‘Actual’ value down.
6. Compare this volume with the value shown in the Flow readout,
volume/nozzle/minute directly under the Manual button, this is the ‘Calculated’
amount, write this value down.
7. Select the Tank icon, the Tank Setup window will be displayed, see Figure 60. Write
down the current ‘Cal. Factor’ for the Flow meter as displayed.
8. Using the formula below this will calculate the new ‘Cal Factor’.
Current Cal. Factor X ‘Calculated’ Amount
= New Cal. Factor
‘Actual’ Amount
‘Calculated’ = value in Flow readout window
‘Actual’= amount measured in the jug for 1 nozzle for 1 minute.
9. To calculate the New Cal.Factor: Divide the ‘Calculated’ amount by the ‘Actual’
amount; then multiply by the Current Cal.Factor.
This value will be the New Cal. Factor.
10. Enter this New Cal. Factor using the Manual Entry method as explained in Section 9.0
(OPTIONS/Sensors/Flow).
Note: Jug tests are not as accurate as the total volume measurement as some errors will exist
due to misting, over spray, nozzle tolerances, and variations in flow rates through boom
hoses.
Setting Up- Calibrate the Flow Meter
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V1.98 21/06/06