Arable
Water/chemical is still being fed to the boom end from the constant feed but is returned back to the sprayer tank via the induction hopper. The spray line pressure is kept at the approximate spray pressure as the water passes through the orifice in the hopper venturi.
When the spray is turned back on, instant spray pressure is achievable.
Filling the sprayer, the clean water takes the same path as when the spray is off. Therefore, the spray lines are flushed with clean water.
Possible problems
• The operator may incorrectly select certain programmes/controls. • There may be air or electrical system problems. • There may be no liquid in the spray tank. • The valves may be faulty. • The pump drive may not be engaged.
Boom height sensor
What are its uses?
• A stable boom reduces wear and tear on both the sprayer and its operator. The sprayer will have a longer lifespan and, because the automatic system reduces the need for constantly monitoring boom height, it means the operator will experience less fatigue and stress. • Headland control: – This raises the boom to a pre-set height when the sprayer is switched off. – It lowers the boom to spraying height when the sprayer is switched on. • It assists when lower boom heights are required. • It may increase spray days. • It aids better coverage. • When turning on headlands, it will counteract the boom pendulum effect, preventing the inner side from dipping.
How does it work?
• Ultrasonic sensors work by sending out a soundwave at a frequency above the range of human hearing. • The sensor determines the distance to a target by measuring the time lapses between the sending and receiving of an ultrasonic pulse. • The sensor usually has four wires: – 1 = 12v supply – 2 = earth – 3 = trigger – 4 = eco, and works in a specific height range.
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