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Water detector

  1. May 31, 2012 #1
    I'm new to the forum, and will much appreciate your advice.
    Looking to build a cheap water detector, that will not change the chemistry of the water.
    It should simply indicate if water is touching it (if water reach a certain level in a tank made of plastic).
    Many thanks
    Al
     
  2. jcsd
  3. May 31, 2012 #2

    Danger

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    Hi, AR.
    Although I don't know the scale of your project, a simple float switch should suffice. As long as there is no turbulence in the water, you can pre-tune it to the point that a mm or so of additional water will trigger it.
     
  4. May 31, 2012 #3
    Any reference or direction for a "simple float switch"?
    My limited experience with floats was that they sometimes remain stuck; any insight will help.
    Many thanks,
    Al
     
  5. May 31, 2012 #4

    Danger

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    Well, I'm no expert on this by any means. Something like a ping-pong ball glued to the end of a mini-lever switch (waterproofed with latex or silicon) would work quite well.

    edit: The waterproofing isn't necessary if you can be sure that the switch will remain dry.
     
  6. May 31, 2012 #5

    Bobbywhy

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    In some experimental submersible sonar units we used two metal strips glued very close together in paralell on a non-conductive surface. Each was connected by a wire to a detector circuit. To one we applied +5 Volts and the other became the input to a comparator. If water intruded (leaked in) it conducted enough of that +5 Volts to switch the comparator to "true= leak".
     
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