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| You'll need a heat exchanger (aka cooler) of some sort to be able to use a flowmeter. That does not separate the liquid from the vapor, but cools the NH3 to liquid form so that it can accurately be measured by a flowmeter. By adding a heat exchanger, you can use any sort of automatic sprayer rate controller to regulate your application -- of course you need components that can handle the NH3.
Most sprayer controller companies make some NH3 controllers. My suggestion is that you buy the NH3 components for your favorite brand of controller. I use Raven and Micro-trak controllers and am happy with both. My NH3 bar has Hiniker heat exchangers and a raven control system.
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