12 - Testing And Fine Tuning; Fine Tuning The Flow Constant - Ppu; Pin & Wire Connection; Testing Flow Transducer - Hardi HC5500 Instruction Book

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
AMP Super Seal
2
3
1

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. Check every second magnet has the same pole orientation so
the rotor magnets are 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.
Box Color coding
+ Brown
Sig. Blue
- Black

12 - Testing and fine tuning

12.1