Thermocouple open circuit detection with tone frequency signal a

Details Thermocouple open circuit detection with tone frequency signal a Thermocouple open circuit detection with tone frequency signal a

1993-07-26

1995-05-23

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324549, 340652, G01R 3102

Patent

active

054184649

ABSTRACT:
An improved open circuit detector for testing a thermocouple for an open circuit condition. The detector includes a generator for providing and sourcing a tone signal to the thermocouple, wherein the tone signal has a known frequency and amplitude. A monitor analyzes the amplitude of a particular frequency component of a tone signal across the thermocouple. If the amplitude of the particular frequency component exceeds a predetermined threshold, an output is provided for indicating an open circuit condition for the thermocouple.

REFERENCES:
patent: 3590370 (1971-06-01), Fleischer
patent: 3760265 (1973-09-01), Hutch
patent: 4166243 (1979-08-01), West et al.
patent: 4307335 (1981-12-01), Paulson
patent: 4841286 (1989-06-01), Kummer
patent: 4965513 (1990-10-01), Haynes et al.

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