Open thermocouple tester system

Details Open thermocouple tester system Open thermocouple tester system

1979-10-24

1981-12-22

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 73R, 340514, 340652, G01R 3102, G08B 2900

Patent

active

043073352

ABSTRACT:
A system for testing open thermocouples in a data acquisition system in which each of a plurality of thermocouples is sequentially read. Each thermocouple has an associated filter capacitor and resistance network and each has a different common-mode voltage with respect to a reference potential. Charging means is effective to charge each filter capacitor in sequence after a reading has been taken. For a normal thermocouple, the filter capacitor discharges through the associated resistance and thermocouple prior to the next sequential reading of that thermocouple. For an open thermocouple the filter capacitor remains charged indicating that the thermocouple is open at the time of the next sequential reading of that thermocouple.

REFERENCES:
patent: 2937369 (1960-05-01), Newbold et al.
patent: 3582926 (1971-06-01), Hassan
patent: 3590370 (1971-06-01), Fleischer
patent: 3760265 (1973-09-01), Hutch
patent: 3973184 (1976-08-01), Raber
patent: 4155080 (1979-05-01), Kovacs
patent: 4166243 (1979-08-01), West et al.

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