Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1985-09-24
1986-11-18
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
136230, G01K 712
Patent
active
046232664
ABSTRACT:
A cold junction compensation bridge for a thermocouple circuit includes a temperature compensation resistor encased in a heat conductive material and is directly connected to the same terminal block or strip to which the thermocouple leads are attached. The compensation resistor is in the same chamber of a housing as the cold junction of the thermocouple so it is subjected to the same temperature as the thermocouple junction. This is of particular importance in two wire current transmitters wherein the housings are multi compartment, with the electronics in one compartment (that may be sealed and not normally opened) and the terminal blocks for connecting the thermocouple and the like, as well as the calibrating screws, in a separate compartment. In such arrangements the thermocouple cold junction can be at a different temperature than the rest of the electronics. In the present invention, the cold junction compensation resistor is in the same location as the junctions of the thermocouple to insure that any changes in temperature of the cold junction are sensed by the resistor.
REFERENCES:
patent: 3680384 (1972-08-01), Grindheim
patent: 3916691 (1975-11-01), Hollander et al.
patent: 3935744 (1976-02-01), Beckman
patent: 4130019 (1978-12-01), Nitschke
patent: 4133700 (1979-01-01), Hollander et al.
patent: 4157663 (1979-06-01), Ihlenfeldt et al.
patent: 4482261 (1984-11-01), Dewey et al.
Publication--"Model 444 Alphaline.RTM.Temperature Transmitters and Assemblies", Rosemont, Inc. 1977--(5 pages)--brochure.
Rosemount Inc.
Yasich Daniel M.
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