Application characteristics of the armored thermocouple2

Armoured thermocouple temperature measurement is the most widely used in the temperature of the device, its main characteristic is the wide temperature range, stable performance, simple structure and good dynamic response at the same time, more can far eastone - 4 20 ma electrical signals to facilitate automatic control and centralized control.

the next project will tell you about the application characteristics of armored thermocouple.

the international application of thermocouple with a standard specification, the provisions on international thermocouple is divided into eight different degree, respectively B, R, S, K, N, E, J and T, its measuring temperature of minus 270 degrees Celsius, the minimum detectable as high as 1800 degrees Celsius, including B, R, S belong to platinum series thermocouple, because platinum are precious metals, so they are also known as precious metal thermocouple and the remaining few called cheap metal thermocouple.

there are two kinds of structure of the thermocouple, regular and armor type. Ordinary thermocouples generally by the hot electrode, insulation tube, to protect casing and junction box parts, such as type and armoured thermocouple is the thermocouple wire, insulation material and metal protective casing combination after assembly, after stretching processing from a combination of a solid.

but it takes a special electrical signal of thermocouple wires to pass, this kind of wire we called compensation conductor. Different thermocouples require different compensation conductor, its main function is connected to the thermocouple, away from the power of the reference junction of the thermocouple, so that the reference temperature stability.

compensation wire is divided into compensation type and extended type two kinds, extend the chemical composition of the wire and the compensation of thermocouple is the same, but in practice, to extend the type of wire is not used is the same as the thermocouple material of metal, usually use and thermocouple wires to replace with the same electron density.

the compensating conductor and thermocouple wires are generally not very clear, the positive connection of the thermocouple compensating conductor of the red line, while the cathode connecting the rest of the color. Most of the material compensating lead wires are commonly used copper nickel alloy.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor