Near Intersection of I-35 & I-90 Southern Mn. | I suspect the flow meter may be dragging. Thus it is not turning as rapidly as it should. The system "thinks" that it is applying less than it really is so it opens the control valve a bit wider to get the turbine to turn faster. Then the applied rate will agree with the target rate you have set but more is being applied than you desire.
Disassemble the flow meter and observe the turbine and its housing. Wear can occur if you run your NH3 tanks "empty" since the last bit is not liquid and causes the turbine to spin at tremendous speeds which accelerates the wear on the turbine shaft and housing. Observe the inside of the housing. There may be scratch marks where the turbine has been rubbing against the side of the housing. There may be other obvious debris.
On flat land I would always swap tanks at about the 10% level. Sooner on hilly ground. Since the cost of repair is considerable, many users now follow my practice.
Edited by tedbear 11/8/2025 08:25
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Farmer owned NH3 bar
