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WMI Failsafe activation delay


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Attached is my WMI setup, the "Failsafe" is a pressure sensor in the line after the pump set to turn the WMI Relay off outside set min/max's. The problem is because the pressure sensor is obviously reading "zero" with system off it will not activate the relay. So, how can I build a delay into the failsafe activation to allow the WMI pressure to build above the min. without compromising  safety  eg: engine still operating under WMI conditions while there is no water/meth flow due to a leak or blockage. Sorry for the story, any help will be appreciated.

https://www.dropbox.com/s/yvx0n0bok36qwvu/WMI Setup.PNG?dl=0



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