What does the 'graduation number' mean for thermocouples and temperature measuring instruments?

The graduation number represents the temperature range, and represents how many volts or millivolts of voltage the thermocouple of each type of graduation number outputs. The thermal resistance indexing table refers to the indexing characteristics of the thermal resistance in the form of a table, that is, the resistance-temperature comparison table. The code name of the thermal resistance indexing table is referred to as the indexing number. The thermal resistance with the same indexing number shall comply with the regulations of the corresponding indexing table. The thermocouple indexing number is only available for standardized thermocouples, so the letter mark of the thermocouple type also becomes the indexing number, which is also the code name of the thermocouple indexing table. The thermocouple indexing table refers to the relationship between the thermoelectromotive force and the measured temperature in the form of a list under the condition that the reference end of the thermocouple is 0 ℃. Thermocouples with the same indexing number can share the same indexing table. Extended information: The basic principle of thermocouple measuring temperature is thermoelectric effect. The secondary meter is a voltmeter or an electronic potentiometer is used to improve accuracy. The indexing numbers of thermocouples are mainly S, R, B, N, K, E, J, T and so on. Among them, S, R, and B belong to precious metal thermocouples, and N, K, E, J, and T belong to low-cost metal thermocouples. Thermal resistance is a kind of temperature detector very commonly used in the medium and low temperature area. Its main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistance is very high. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermal resistors are mostly made of pure metal materials. At present, platinum and copper are widely used. In addition, materials such as nickel, manganese, and rhodium have been used to make thermal resistors.

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