Cold junction thermocouple compensator

Details Cold junction thermocouple compensator Cold junction thermocouple compensator

1977-12-21

1979-01-09

Sebastian, Leland A.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73341, 136242, 136222, 340515, H01L 3528

Patent

active

041337000

ABSTRACT:
0.degree.COLD JUNCTION COMPENSATOR PROVIDES THE ELECTRICAL EQUIVALENT OF AN ICE-BATH REFERENCE THERMOCOUPLE, AT A SELECTED TEMPERATURE, FOR EXAMPLE O.degree. C. Input connectors, for engagement with conventional thermocouple units, form thermocouple junctions with conductors connected to a battery-operated Wheatstone bridge circuit adapted to supply an equal and opposite voltage output compensating for variations in the thermocouple junction output at different ambient temperatures. The compensator may be included in a module having input sockets or input plugs to coact with plugs or sockets of conventional thermocouple units. The compensator and battery may be encapsulated, or an accessible switch may be included in the battery circuit.

REFERENCES:
patent: 1205325 (1916-11-01), Clark
patent: 1228678 (1917-06-01), Johnson
patent: 1411033 (1922-03-01), Jensen
patent: 3225597 (1965-12-01), Engelhard
patent: 3650154 (1972-03-01), Arnett et al.
patent: 3916691 (1975-11-01), Hollander et al.
Product Bulletin 803-A, Omega Engineering, Inc., 4 pages.
Catalog No. C021, Consolidated Omega Devices, Inc., 6 pages.
Avasthy, "Cold Junction Compensation for Thermocouple Sensors, Jul. 1973, pp. 211 to 212, Institution of Engineers (India), vol. 53, pt. 6.

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