Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-05-13
1998-08-11
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340511, 340512, 340514, 340516, G08B 1706
Patent
active
057932930
ABSTRACT:
A temperature sensing system for over-heat detection includes a temperature sensing cable, interface unit and termination unit. The interface unit is configured to issue interrogation, communication and power signals to the termination unit through the temperature sensing cable. During normal operation issuance of the interrogation signal results in no reflection pulses, as the signal is dissipated through the termination resistance in the termination unit. When an over-heat, short circuit or open circuit condition exists, a reflected pulse is detected by the interface unit and this information is used to determine the type and location of the condition. The interface unit is also configured to supply power to the termination unit which in turn is stored in the termination unit to power its operations, including setting of the resistor values. The termination unit is used as an instrument of calibration in the subject system.
REFERENCES:
patent: 3774184 (1973-11-01), Scarelli
patent: 5185594 (1993-02-01), De Church
Heggs Richard P.
Melamud Lucy
O'Loughlin Mark E.
Furon Company
Swann Glen
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