Connection diagram 7607/2 in cabinet filter plants A = Run-dry protection sensor „too low“ below normal water level C protects the filter plant against failure of the water refill plant B = Overflow sensor „too high“ in the aquarium protects against a clogged drain, for example C = Normal water level in the filter tank D = Connection of in-feed pump to aquarium, for example E = Second overflow sensor „too high“ in the filter tank provides protection, if the water refill plant is not switched off
