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If you just have one, the easiest way is to simply use a Channel Event.  So, if you have a channel called "level" with your level reading, and a digital output channel called "pump" that controls the pump, and you want the pump to turn on at 3, and off at 4 (I'm assuming the pump is filling the tank), you would put this in the Event for the level channel:

if (level[0] < 3)
   pump = 1
endif
if (level[0] > 4)
   pump = 0
endif

Make sure it goes in the event for "level" and NOT pump.  The event is a tab in the channel view for the channel.  Expand CHANNELS: in the workspace, then click on the level channel.

 

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