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Wire-sensored fire extinguisher with fault-monitoring control system

  • US 5,207,276 A
  • Filed: 02/04/1992
  • Issued: 05/04/1993
  • Est. Priority Date: 04/25/1991
  • Status: Expired due to Fees
First Claim
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1. A system for protecting a predetermined region from a fire which may occur therein, the system comprising:

  • fire suppressant supply means for containing a quantity of pressurized fire suppressant material;

    actuatable discharge means for releasing said quantity of pressurized fire suppressant material upon actuation of said actuatable discharge means;

    sensor means arranged in the vicinity of the predetermined region, said sensor means having an electrical characteristic which changes in response to heat in the protected region, said sensor means having;

    first and second conductors;

    a supervisory electrical current flowing through said first and second conductors;

    conductor separation means having a predetermined heat response characteristic whereby said first and second conductors are maintained electrically insulated from one another below a predetermined temperature, and are brought into electrical communication with one another when said predetermined temperature is exceeded to produce a reduced electrical impedance characteristic across said first and second conductors and a corresponding increase in the magnitude of said supervisory electrical current;

    sensor monitor means for monitoring said supervisory electrical current, and for signalling an increase in the magnitude thereof; and

    trigger means responsive to said signalling of said sensor monitor means for actuating said actuatable discharge means.

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