13.1
13 - Testing and fine tuning
Testing and fine tuning
Fine tuning the flow constant - PPU
Calibration of the flow transducer is carried out with clean water, but small changes may occur when adding pesticides or
fertilizer. This will effect the final readings. This is typically noted when the volume displayed on the display does not equal
the actual known volume that was sprayed out. The formula below can be used to “fine tune” the flow transducer PPU.
New PPU = (Original PPU x Displayed Volume) / Sprayed Volume
For example, the spray tank is filled with 1000 gallons of spray liquid. When sprayed out, the display showed a total of 900
gallons. (Original PPU = 485.0)
New PPU = (485.0 (Original PPU) x 900 (Displayed Volume)) / 1000 (Sprayed Volume) = 436.5
Note the relation is inverse:
÷
To raise the displayed volume, the PPU is lowered.
÷
To lower the displayed volume, the PPU is raised.
Pin & Wire connection
Testing flow transducer
BROWN wire to positive of 12 volt battery.
BLACK wire to negative.
BLUE wire to multimeter positive.
1. Check the rotor turns freely.
2. Each vane in the rotor has a magnet in it with the pole facing out.
Check that the 4 magnets are present.
3. Use a magnet to check that every second magnet in the rotor has
the same pole orientation. The rotor magnets must be N - S - N - S.
4. Connect negative from multimeter to negative of battery.
5. Set multimeter to DC volt.
6. By turning the mill wheel slowly, this will register approx. 8.0 +/ 1
volt with the diode on and 0.3 +/- 0.1 volt with the diode off with
every second magnet.
AMP Super Seal Box Color coding
2+Brown
3Sig.Blue
1-Black
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