Sensor for detecting the presence and location of a water leak

• US 4,677,371 A
• Filed: 09/06/1985
• Issued: 06/30/1987
• Est. Priority Date: 10/09/1984
• Status: Expired due to Fees

• Current Assignee: Junkosha Company Limited
• Original Assignee: Junkosha Company Limited
• Inventors: Imaizumi, Haruo
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Harvey, Jack B.
• Application Number:
  US06/773,210
• Time in Patent Office: 662 Days
• Field of Search: 324/52, 324/54, 324/51, 174/11 R, 174/115, 73/40.5 R, 73/40, 73/49.1, 340/605, 340/604, 200/61.04, 200/61.05
• US Class Current: 324/544
• CPC Class Codes: G01M 3/165 by means of cables or similar elongated devices, e.g. tapes

Abstract

A coaxial cable and a bare wire are aligned in parallel relationship and affixed within insulation covers which have openings therein so as to partly expose both the bare wire and the outer conductor of the coaxial cable at the atmosphere, forming a leak detecting sensor. By the use of resistance meters, the core wire of the coaxial cable is utilized to detect both the presence and the location of a leak.

Claims

1. A leak detecting sensor for detecting leaks of water comprising a coaxial cable having a central conductor and an external conductor separated by an electrically insulating material, and a bare conductor juxtaposed in substantially parallel relation to said coaxial cable, said coaxial cable and bare conductor held between insulating coverings at a desired spacing, said insulating coverings having openings therein adjacent the coaxial cable and the bare conductor.

2. The sensor of claim 1 wherein said external conductor of said coaxial cable is of a braided construction comprising conductor wires braided together with hydrophilic yarn filaments.

3. The sensor of claim 1 wherein said insulating coverings are made of a hydrophobic resin material.

4. The sensor of claim 3 wherein said hydrophobic resin material is a fluoroplastic resin.