Boom pressure and nozzle testing transcript
Generally we utilise a spray plan to test the sprayer. For example, we're going to drive an average of 20 kilometres per hour at three bar pressure. Within the plan we've picked up two bar at 16.2 kilometres per hour, and the nozzle's still working. We can go to the spray computer, key in a test speed in, and then go back and look at the testing gauge at the nozzle.
We reference back to the main gauge, knowing that's where two bar is, and mark it with a texta and you've tested the sprayer. Check that the nozzles are working properly by checking their pressure. This can be done using a standard jug but this method can have an error factor of up to six per cent.
You can do this more accurately by checking the pressure that the sprayer is registering at the nozzle. For example, for a sprayer that has 025 nozzles fitted, at three bar each nozzle is spraying one litre per minute, and there's 72 nozzles on the boom; so that at three bar the sprayer should be outputting 72 litres per minute in the rate controller.
Nozzles should be tested at both ends of the boom section; at the inlet and then at the extremities by using an accurate pressure gauge.
View the Boom pressure and nozzle testing video.