Discuss Continuity Relay in the UK Electrical Forum area at ElectriciansForums.net

Another approach to the problem of clean switching is to have two sensors for hysterisis:
  1. water low sensor to turn off
  2. water high to turn on
So with the level below (1) the relay is latched off, then on exceeding (2) it is set on until it drops below (1) again. Another thing is if your float switches are change-over, you can sense if the circuit has gone open by a lack of both NC and NO showing continuity.

A timer that runs for X seconds after 'off' might be simpler!
 

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