Thermocouple compensating cable, usually by wire, insulation, sheath, shielding layer. But in everyday use, according to the different types of thermocouple compensating cable, with different types of classification. Extended type compensation cable extension type compensation cable, the wire in the name of the chemical components and the nominal value and thermoelectric emfs thermocouple, same with the letter 'x' attached to the thermocouple said after graduation, such as 'kx' said k type thermocouple with compensation conductor should be extended type thermocouple type compensation cable, compensation type compensation cable, the wire in the name of the chemical composition and thermocouple are different, but its thermoelectric emfs ( 0 a lo) ℃ or ( 0~zoo) ℃ with with the thermocouple thermoelectric emfs values are the same, with the letter 'c' attached to the thermocouple said after graduation, such as 'kc'. Different wire can be applied to the same degree of thermocouple, difference and additional letters, such as 'kca', 'KCB'. By using temperature thermocouple compensating cable can be divided into general use, Mark g) And the heat resistance ( H) Two kinds. Thermocouple compensating cable according to the permissible error can be divided into precision level ( Mark a) And regular grade ( B) Two kinds. Thermocouple compensating cable according to the wire core type can be divided into single strands of wire core and multi-strand wire core two kinds. A variety of different types of compensation cable, its thermal properties are not the same. At the same temperature compensating conductor only with matching type of thermocouples. If in the heart of the field use compensation conductor should be wrong, instrument can't reflect the real temperature.