Calibrated probe for temperature measuring

Details Calibrated probe for temperature measuring Calibrated probe for temperature measuring

G - Physics

01

K

73/0.5

G01K 15/00 (2006.01) G01K 7/02 (2006.01)

Patent

CA 1207163

ABSTRACT OF THE DISCLOSURE A temperature probe using a first thermocouple junction at the end of a metal tip for measuring the temperature of an object is also provided with a second thermocouple junction on the metal tip at a predetermined distance from the first thermocouple for detecting heat flow in the tip from the first thermocouple toward the second thermocouple. Electronics responsive to both thermo- couples drive a heater which maintains the second thermocouple at substantially the same temperature as the first thermocouple, thereby to eliminate heat loading by the probe on the object being measured. A single adjustable resistance temperature detector electronically connected in series with the metal tip is used to calibrate the probe and compensate for errors in the tem- perature readings of the first and second thermocouples. The resistance temperature detector is made up of a wire located in the handle of the probe and is adjusted by stretching the wire to reduce its diameter and bulk resistance.

425749

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