Thermocouple temperature measurement principle and the advantages of the thermocouple1

Basic principle of thermocouple temperature measurement: the two kinds of different welding material A conductor or semi-conductor A or B, form A closed loop. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, thus forming the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermocouple is in using this effect to work.

thermocouple types: a, standard thermocouple; B, the thermocouple

the so-called standard thermocouple is refers to the national standard specifies its thermoelectric potential and the relationship between temperature, permissible error, and a unified standard score table of thermocouple, it has with matching display instrument to use, not standardized thermocouple or on the order of magnitude less than the range to use standardized thermocouple, generally no unified indexing table, the measurement is mainly used in some special occasions.

standardized thermocouple: since January 1, 1988 in our country, the thermocouple and thermal resistance were manufactured according to IEC international standard, and specify the S, B, E, K, R, J, T seven standardization thermocouple type thermocouple for our country unified design.

thermocouple its advantages:

thermocouple is one of the most commonly used temperature detecting element of industry.

a, high measurement precision. Because of thermocouple direct contact with the object being measured, not affected by intermediate medium.

b, wide measuring range. The commonly used thermocouple from - 50°C - - + 1600 ° C can renew edge measurement, some special thermocouple minimum measurable to - 269°C（ Such as: gold, iron, nickel, chromium) , up to + 2800 ° C ( Such as: tungsten rhenium) 。

c, simple structure, easy to use. Thermocouple is usually composed of two different kinds of metal wire, but is not limited by the size and the beginning of, outside has protective casing, which are very convenient.

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