You don't need If pH < 8.39 then on. It'll run continuously until it 8.4, but 8.4 is a fail-safe not a target.
Apex will continuously check to see if each line is satisfied. When your pH drops to 8.39, the Apex will turn on the doser itself. No need to tell it.
Question is if ph hits 8.4 and pump automatically shuts off how do I write code to turn doser back on once ph drops back down?
Apex will continuously check to see if each line is satisfied. When your pH drops to 8.39, the Apex will turn on the doser itself. No need to tell it.