Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-02-08
1989-06-20
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
324537, G08B 2100
Patent
active
048412864
ABSTRACT:
In a process control network, apparatus and method for periodic testing of a thermocouple element includes a switching mechanism that inserts a circuit with known parameters in series with the thermocouple. Voltages levels with and without the inserted circuit are compared and used to identify a failed or failing thermocouple.
REFERENCES:
patent: 3468164 (1969-09-01), Sutherland
patent: 3590370 (1971-06-01), Fleischer
patent: 3973184 (1976-08-01), Raber
patent: 4571689 (1986-02-01), Hildebrand et al.
Hofsass Jeffery A.
Holloway William W.
Honeywell Inc.
Lenkszus Donald J.
Orsino Joseph A.
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