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Fluid detecting alarm system

  • US 4,939,504 A
  • Filed: 09/27/1989
  • Issued: 07/03/1990
  • Est. Priority Date: 09/27/1989
  • Status: Expired due to Fees
First Claim
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1. A self-contained liquid water detection alarm system comprising a case having a well with a mouth opening through a lower wall of said case, electrically operated alarm means carried by said case, and an electric circuit inside said case, said circuit comprising a battery, electrically connected on one side to said alarm means and on the other side to one of two electrodes projecting into said well, the other of said electrodes being electrically connected to the said alarm means, said electrodes being spaced from one another a distance to ensure that no current will pass between them in the absence of a conducting medium, a dry medium bridging the space between said electrodes, said medium being a pulverulent salt, substantially non-conductive when dry and conductive when wet, and water pervious closure means over said open mouth to retain said salt and to permit ingress of water.

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