The most commonly used standards for armored thermocouples

Commonly used thermocouples can be divided into two categories: standard and non-standard thermocouples. The called standard thermocouple refers to a thermocouple with a unified standard graduation table that specifies the relationship between its thermoelectric potential and temperature, the allowable error, and its matching display instrument is available for selection. Non-standardized thermocouples are inferior to standardized thermocouples in the scope or order of magnitude, and there is generally no unified indexing table, which is mainly used for measurement in some special occasions. Standardized armored thermocouples. Since January 1, 1988, armored thermocouples and all of them have been produced in accordance with IEC international standards, and designated S, B, E, K, R, J, T seven standardized thermocouples are unified in my country Design thermocouple. In order to ensure the reliable and stable operation of the thermocouple, the structure of the armored thermocouple is required to be as follows: ①The welding of the two thermocouples composing the thermocouple must be firm; ②The two thermocouples should be in good contact with each other Insulate to prevent short circuit; ③The connection between the compensation wire and the free end of the thermocouple should be convenient and reliable; ④The protective sleeve should be able to ensure that the hot electrode is fully isolated from the harmful medium. The temperature compensation of the cold junction of the armored thermocouple is generally more expensive (especially when precious metals are used), and the distance between the temperature measurement point and the instrument is very long. In order to save thermocouple materials and reduce costs, it is usually used The compensation wire extends the cold end (free end) of the thermocouple into the control room where the temperature is relatively stable and connects to the terminal of the instrument. It must be pointed out that the function of the thermocouple compensation wire is only to extend the hot electrode and move the cold end of the thermocouple to the instrument terminal of the control room. By itself, it cannot eliminate the influence of the temperature change of the cold end on the temperature measurement and cannot compensate. Therefore, other correction methods are needed to compensate for the influence of the cold junction temperature t0≠0°C on the temperature measurement. When using the thermocouple compensation wire, you must pay attention to the matching of the model, the polarity can not be wrong, and the temperature of the compensation wire and the thermocouple connection end can not exceed 100 ℃

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