Thermocouple circuit

Details Thermocouple circuit Thermocouple circuit

1973-12-26

1976-07-13

Goldberg, Gerald

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, H05B 102

Patent

active

039696111

ABSTRACT:
A thermocouple circuit has dissimilar conductors joined to form a conventional temperature transducer located in a zone to be monitored or controlled. The opposite ends of these conductors are connected to similar metal leads in a capsule located in a stable oven to form a reference junction. The oven also houses an inexpensive integrated circuit operational amplifier which is electrically connected to the similar metal leads to yield a high gain output signal proportional to the weak thermal e.m.f. in the dissimilar conductors. This signal is compared to a preset reference voltage level and the difference signal converted to a temperature correction signal which is in binary form. The oven, the operational amplifier, and the binary signal producing circuitry are all driven by a power source which has as its reference or common potential an isolated voltage level tapped off the shielded secondary winding of an otherwise conventional transformer. The binary signal is de-isolated by providing an optical coupler to other non-isolated equipment for operation of a heater located in the zone.

REFERENCES:
patent: 3028473 (1962-04-01), Dyer et al.
patent: 3381212 (1968-04-01), Peltola et al.
patent: 3453450 (1969-07-01), Evalds

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