standardized thermocouple ? The hot electrode diameters and tolerances of
standardized thermocouples should meet the requirements of Table 5-20.
What is the supervisory verification of standard thermocouples? The calibration procedures for
standard thermocouples require that for frequently used standard thermocouples, in order to ensure the accuracy and reliability of the values, necessary supervisory verification should be carried out according to the usage conditions.
The supervisory verification method is to use a thermocouple of a higher grade or an infrequently used thermocouple of the same grade as a standard to compare and calibrate the thermoelectromotive force of one of the inspection points (such as the copper graduation point).
What standards and instruments are used for calibration of standard thermocouples?
The standards and instruments and equipment that should be possessed when calibrating standard thermocouples are shown in Table 5-21.
What standards and instruments are used when calibrating working thermocouples?
The standards and instruments and equipment that should be used when calibrating the working thermocouple are shown in Table 5-22.
What is the standard instrument used to calibrate each temperature of the working thermocouple?
The temperature range of working thermocouples is very wide, up to -200~3200℃, but generally working thermocouples are suitable for a certain temperature measurement section. The correct selection and use of temperature standards is an important factor in ensuring the quality of calibration. Therefore, when calibrating thermocouples at different temperatures, different standard instruments should be used. For details, see Table 5-23
