I never got any replies from Abit, (sent it a few times). Didn't really expect a reply I suppose. It does seem to work fine with shutdown now though, I test it a few times each week by shutting the pump off to make sure it works ok.
The flow switch after all is just that, a simple make or break set of contacts so you could switch anything with it. It's rated for mains voltage, but I'd rather switch a 12v relay to swich the mains remoltly if I wated to do that. You could of course run the ATX "power up" wire through the flow switch that would be an instant shut down, but the delay on flow start up might cause this to be problamatic. The other option is to use the flow switch to control an adjustable time delay relay, they are pretty easy to make.
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