METHOD FOR CALIBRATION OF THERMOCOUPLES Russian patent published in 1994 - IPC

FIELD: calibration of thermocouples from noble metals with thermocouple wire length less than 800 mm. SUBSTANCE: welded to free ends of electrodes of calibrated thermocouple are additional electrodes identical to electrodes of standard thermocouple in calibration characteristic. Free ends of both thermocouples are thermostated at 0 C. Thermal and electric contact is effected of point of welding of opposite in sign electrodes: one of electrodes of graduated thermocouple and additional electrode with electrodes of standard thermocouple. At several temperatures of calibrating furnace the thermo-emf of calibrated thermocouple and standard thermocouple thermo-emf are measured and their difference is calculated. Measured values are used to determined the sought calibrating characteristic with consideration of correction introduced in readings of calibrated thermocouple with additional electrodes. EFFECT: higher efficiency. 2 dwg