Testing And Fine Tuning; Fine Tuning The Flow Constant - Ppu - 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
fertiliser. 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 below formula can be used to "fine tune" the flow transducer PPU.
×
Original PPU Displayed Volume
NewPPU = ----------------------------------------------------------------------------------
Sprayed Volume
For example, the spray tank is filled with 2400 litres of spray liquid.
When sprayed out, the display showed a total of 2300 litres. (Original PPU = 120.0)
×
120PPU 2300Litres
NewPPU
= --------------------------------------------------- -
2400Litres
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 Box
2 Positive
3 Sig.
1 Negative
115 0 PPU ,
=
Color coding
Brown
Blue
Black
13 - Testing and fine tuning
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