Spray system is best charged one yet – firm

7 March 1997




Spray system is best charged one yet – firm

By Andrew Faulkner

OPPOSITES attract – a system Melroe is employing in the latest development for its Spra-Coupe range of self-propelled sprayers.

The company concedes that electrically charging pesticide, to boost its attraction to a neutral crop, is not new.

But it claims that its Energised Spray Process (ESP) is more reliable than any similar technology tried in the past.

"The secret is the way in which the liquid is charged – and hanging onto that charge," says Melroes Wim Vervoort.

Key to the system is a second mini spray tank, mounted above the sprayers centre boom section.

This mini tank incorporates a shower head which, when fed with chemical from the main tank, creates enlarged spray droplets. These larger droplets, Mr Vervoort claims, are better suited to accepting an electrical charge and, once taken up, hanging onto that charge. Final droplet size is unaffected by the process, he says.

Source of the electrical charge is the sprayers 12V battery, which is connected up to a mini-transformer to pump out 40,000V. This then passes through the mini tank and shower head, and charges the spray. All other machine parts are isolated and only minimal current used to make the complete system safe.

"In effect, the process creates an electrical field between the spray nozzles and the plant. It accelerates the droplets by up to 50%, reducing chemical drift and increasing penetration – without altering droplet size."

Melroe hopes to have an 18m (60ft) boom, complete with ESP option, at this summers Sprays & Sprayers demo. Option price, when ESP eventually goes on sale, should be about the same as a sprayer equipped with air assistance.

Melroes ESPsystem electric -ally charges pesticide to boost crop coverage and reduce drift.


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