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Water presence detector

Discussion in 'Electronic Design' started by Ignoramus24108, Jun 27, 2006.

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  1. I am redoing my basement sump pump. The current one is old and I got a
    decent deal on a Zoeller M137 sump pump, see

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6067283046

    I want to build some simple circuit that would turn on a switch when
    it detects water. I want to place the sensor in the top part of the
    sump in the basement, to warn us when sump pump is not working right.

    It would NOT be the job of the switch to turn the sump pump on and
    off. Its job will, instead, be to sound an alarm when the pump is not
    working AND the sump is overflowing.

    My question is, how to do it in a most failure proof manner
    possible. Somethin that would work after years of not working (since I
    expect the pump to last for a while so that this system would not get
    actuated). If there is something that I could simply buy, that is time
    tested, I would rather use that.

    i
     
  2. I made a water detector for my basement floor from a battery-operated
    smoke detector. I just replaced the smoke sensing element with two
    contacts that I melted into a piece of plastic located at the end of a
    bit of coax about 4 ft. long. It has worked for years. The advantages
    are that it's inexpensive (at the time, it was about $10 for a smoke
    detector), it operates on an ordinary 9 V battery, so it works even if
    there's a power failure, and it gives warning beeps when the battery
    starts to get weak. The disadvantages are that after the sensor gets
    wet, it has to thoroughly dry out before it'll stop beeping, so you
    have to remove the battery, or put an on-off switch on it as I did.
     
  3. Here is a commonly used device:
    http://www.kari-finn.fi/eng/e_index.html
     
  4. Gerald

    Gerald Guest

    I went to West Marine and got an inexpensive Bilge Pump float switch. I am a
    boater so that seemed like the logical way to go. Wire it with a 12V wall
    wart to power a buzzer / siren and you are ready to go. I eventually got
    the switches (I have 3 sumps) wired into the house security alarm system.
     
  5. Pubudu

    Pubudu Guest

  6. John Fields

    John Fields Guest

     
  7. Sounds good, I am a boater also and I will look for a float switch.

    i
     
  8. Al

    Al Guest

    The old toilet bowl float on the end of an arm that closes a
    microswitch. Build a moat around your sump hole. Place the float gadget
    in the moat. When the moat has water in it, the sump hole is overflowing
    and the pump is not running.

    Al
     
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