Resistive sensor for position detection of manifold failures

Details Resistive sensor for position detection of manifold failures Resistive sensor for position detection of manifold failures

1993-01-07

1994-03-15

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Ambient temperature

338214, 374114, H01C 304, H01C 306

Patent

active

052949095

ABSTRACT:
An elongate resistive sensor useful as an element of a pneumatic manifold failure detecting and locating system. A sensing loop is based on a coaxial cable having a core of known resistance per unit length. A eutectic salt impregnated insulant separates the core and sheath but has a temperature breakdown characteristic which provides the sensing function. Upon a pneumatic manifold failure, the sensing cable is heated, the eutectic salt insulator breaks down, a core-to-sheath short occurs, and currents in the sensing cable are substantially altered as a result. The cable is connected as a loop, and differential currents into the ends of the loop are detected and processed to determine the position of the short. Terminating resistors are associated with connectors which connect multiple cable sections into a single loop, and the terminating impedance is further sensed to determine an open circuit condition at any connector.

REFERENCES:
patent: 3406389 (1968-10-01), Nailen
patent: 3540041 (1970-11-01), Payne
"Continuous Fire & Overheat Detection System", Fenwal Incorporated Jan. 1989 publication No. 4.110.B IM.
"The Fenwal Discrete, Continuous Fire and Overheat Detection System", Fenwal Incorporated May 1985 pulbication No. MC 385.
"Continuous Fire and Overheat Detection Systems for Industry", Fenwal Incorporated Mar. 1991 publication No. 4.11.7 R1.
"The Kidde Connection", Walter Kidde Feb. 1989 publication No. A-802-R2-2.

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