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 fibreglass. 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.
A2677 Rev 1.5 |
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