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LEAKAGE INDICATOR FOR A FIRE EXTINGUISHER

  • US 3,735,376 A
  • Filed: 03/05/1971
  • Issued: 05/22/1973
  • Est. Priority Date: 03/05/1971
  • Status: Expired due to Term
First Claim
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1. The combination of a fire extinguisher having a first container filled with fire extinguishing fluid, a second container filled with fluid of substantially the same composition and proportion of fire extinguishing fluid as in the first container, a protective housing having a diaphragm for coupling the two containers to each other, said diaphragm sealing the second container so that one side of the diaphragm is subjected to the pressure of the fluid of the second container, the other side of said diaphragm being exposed to the pressure of the fluid of the first container, and means responsive to a predetermined differential pressure between the fluids of the two containers to render a signal substantially independently of the ambient temperature.

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