What are the standard thermocouple?

What are the standard thermocouple? Using thermocouple in the world has a standard, the international rules on the thermocouple is divided into eight different degree, armoured thermocouple discern for S, K, B, R, E, N, J and T, the measurement of the measurable temperature of minus 270 degrees Celsius, can reach 1800 degrees c, B, R, S belong to platinum series thermocouple, because platinum belongs to rare metals, so they are also known as precious metal thermocouple and the remaining few called cheap metal thermocouple.

there are two kinds of the structure of the thermocouple, regular and armor type. Normal sexual thermocouple normal by hot electrode, insulation pipe, casing and the junction box and other local maintenance, and armoured thermocouple type is the thermocouple wire, insulation materials and metal casing after removal of the three coordinate maintenance experience stretch processing and become a solid ligand. But it needs a special electrical signal of thermocouple wires to pass, this wire is compensation conductor. Regular compensation conductor material big local adopts copper nickel alloy.

different thermocouple needs different compensation conductor, its important role is to interface with thermocouple, thermocouple reference end away from the power supply, so that the reference temperature stable. Compensation wire is divided into compensation type and expanded, the chemical composition of extension wire and the compensation of thermocouple on the contrary, but in practice, extension type wire is not used and thermocouple material instead of metal, ordinary and thermocouple wire instead of electron density in alternative. Compensation conductor and thermocouple wires is very clear, the positive cohesion of the thermocouple compensation wire, white wire, while negative join the rest of the color.