Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The standard thermocouple that is called refers to the thermocouple that the national standard specifies the relationship between the thermoelectric potential and the temperature, the allowable error, and the uniform standard index table. It has a display instrument that is compatible with it. Non-standardized thermocouples are not as good as standardized thermocouples in terms of use or order of magnitude. Generally, there is no uniform indexing table, which is mainly used for measurement in some special occasions. Standardized Thermocouples Since January 1, 1988, thermocouples and thermal resistors have all been produced in accordance with IEC international standards, and seven standardized thermocouples, S, B, E, K, R, J, and T, have been designated as China's unified design. Thermocouple.
Commonly used thermocouple indexing numbers are S, B, K, E, T, J, etc. These are standardized thermocouples. Among them, the K type is a nickel-chromium-nickel silicon thermocouple, which is a cheap thermocouple capable of measuring higher temperatures. Since this alloy has good high temperature oxidation resistance, it can be applied to oxidizing or neutral media. It can measure high temperatures of 1000 degrees for a long time and 1200 degrees in the short term. It cannot be used in reducing media, otherwise it will corrode quickly, in this case it can only be used for measurements below 500 degrees. It is much cheaper than the S-type thermocouple, it has good repeatability, produces a large thermoelectric potential, and is therefore highly sensitive, and its linearity is very good. Although its measurement accuracy is slightly lower, it can fully meet the industrial temperature measurement requirements, so it is the most commonly used thermocouple in the industry.
Common thermocouple indexing table
Thermocouple indexing number
Hot electrode material
Operating temperature range (°C)
positive electrode
negative electrode
S platinum rhodium alloy
Platinum rhodium alloy (é“‘ content 10%)
Pure platinum
0-1400
R platinum rhodium alloy
Platinum rhodium alloy (é“‘ content 13%)
Pure platinum
0-1400
B platinum rhodium alloy
Platinum-rhodium alloy (é“‘ content 30%)
Platinum rhodium alloy (é“‘ content 6%)
0-1400
K
Nickel chrome
Nickel silicon
-200-+1000
T
Pure copper
Copper nickel
-200-+300
J
iron
Copper nickel
N
Nickel chromium silicon
Nickel silicon
E
Nickel chrome
Copper nickel
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