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A2677 Rev 1.5
X20 Sprayer Reference Manual
Problem 24
Incorrect volumes
Information
The volume used, and the rate both require the FCAL to be accurate.
If the FCAL is incorrect, the volume used shown in the console will
not be correct, and the rate control will not be operating at the correct
rate. The console will not show any problem as it will be working
with the data received, but when a comparison with the activity on
the ground is made, there could be spray left over or run out before
the expected area was covered. When an FCAL is performed
correctly, the accuracy of the FCAL is only limited by the accuracy of
the measurement of the liquid drawn off. Typically this could be less
than 0.1% for a system in good order. Most volume errors come from
the expectation that the tank markings are accurate. At the best, tank
markings are only a guide, and if there is less than 10% error between
the real volume and tank markings, it is luck. Most tanks these days
are plastic or breglass. Take a 2000 litre plastic tank, put 2 tonne of
water in it, and it has got to change shape/volume etc. Make it 2 years
old, the plastic characteristics will change, and the change will be
different with the same 2 tonne load.