I have a SJE Rhombus 3 float system for my septic grey water tank. Twice I've had an issue where the pump stop float failed and the pump just ran and ran. The pump is 240v and the float is 120v. Any ideas on a timer that would count down when the pump is running and then alarm if it ran longer than a set time, like 5 or so minutes? The timer would then need to reset each time the pump turned off.