Seems like one of the big hurdles in system automation is how to determine how transfer X gallons from the HLT to the MLT, and other volume specific processes.
Flow meters are expensive
ultrasonic level sensors are expensive.
I found this:
assuming you could find one for lower pressures, you could use this to regulate the flow out of the pump....
therefore volume would essentially be a function of time.
Just a thought i wanted to throw out there for you guys to mull around.
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