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US 4,878,226 AGranted
Multiple point remote temperature sensing
AssigneesCombustion Engineering, Inc., The Curators of the University of Missouri
InventorsBryan K. McQuoid, Earl J. Charlson, Huber Graham
Life of this patent
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Abstract
A multiple point remote temperature sensing system includes a cable having temperature responsive segments as spaced along the length of the cable and being integral therewith. Each of the temperature responsive segments includes a temperature measuring device and a circuit which establishes a unique address for the segment whereby the local ambient temperature at each segment may be interrogated from a remote location.
Claims29
Apparatus for sensing the temperature at a plurality of remotely located points in a predetermined sequence comprising:
- elongated cable means, said cable means having a pair of opposite ends and at least a pair of access terminals at a first of the said ends thereof, said cable means including a conductor extending from each of said access terminals to the second end thereof, said cable means further including plural spatially separated inactive segments positioned along the length thereof, said inactive segments being comprised of material which is an electrical and thermal insulator;
- a plurality of spatially separated temperature responsive electrical circuit components carried by said cable means, said components being located along said cable means in regions between said inactive segments thereof, each of said components providing a signal which varies as a function of local ambient temperature;
- a plurality of sensor circuits, each of said sensor circuits being juxtapositioned to and electrically connected to an associated one of said temperature responsive components, said sensor circuits each having a unique address and being responsive to an interrogating signal which includes the unique address;
- means connecting each of said sensor circuits to at least a first of said cable means conductors whereby information commensurate with the signal provided by said temperature responsive components may be sampled via the sensor circuit associated therewith in response to an interrogating signal which includes the sensor circuit address;
- and
- address signal generator means connected to said first cable means conductor via a cable means access terminal for generating interrogating signals for said sensor circuits in a predetermined sequence, each of said interrogating signals including the address of a sensor circuit whereby the information commensurate with the signals provided by said temperature responsive components will be individually available on said first cable means conductor.
3 more elements
Dependencies are inferred from the claim text.