Also consider that there is a LOT of redundancy in the current goals; are they all needed?
If pump fails then temperature would rise. System could be shut down by this rise and therefore no need to monitor for flow.
The REAL goal is peace of mind while running a big beefy peltier based system. How to get there most elegantly and effectively?
For example, KnightElite operates simply using a surge protector that I wired a 12V relay into. The pump and pelt psu are plugged into that and so they turn on and off with the PC. Is this enough? Not especially elegant for sure. The other end of the spectrum is the setup that Asetek (or even Corsair) use as controllers for their systems. I was thinking that a homebrew reproduction of those might be of interest and value.
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