Self-validating thermocouple

Details Self-validating thermocouple Self-validating thermocouple

2007-07-13

2010-11-30

Caputo, Lisa M (Department: 2855)

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

C374S183000, C374S170000, C374S181000

Reexamination Certificate

active

07841771

ABSTRACT:
Self-Validating Thermocouple (SVT) Systems capable of detecting sensor probe open circuits, short circuits, and unnoticeable faults such as a probe debonding and probe degradation are useful in the measurement of temperatures. SVT Systems provide such capabilities by incorporating a heating or excitation element into the measuring junction of the thermocouple. By heating the measuring junction and observing the decay time for the detected DC voltage signal, it is possible to indicate whether the thermocouple is bonded or debonded. A change in the thermal transfer function of the thermocouple system causes a change in the rise and decay times of the thermocouple output. Incorporation of the excitation element does not interfere with normal thermocouple operation, thus further allowing traditional validation procedures as well.

REFERENCES:
patent: 5709470 (1998-01-01), Finley
patent: 5887978 (1999-03-01), Lunghofer et al.
patent: 5929438 (1999-07-01), Suzuki et al.
patent: 6692145 (2004-02-01), Gianchandani et al.
patent: 2007/0209977 (2007-09-01), Wilf et al.
Thermocouples—A Quick Guide, AZoM.

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