The product characteristics of armored thermocouple1

Armored thermocouple is a kind of common temperature measuring instrument, usually with temperature transmitter, controller and display instrument, is widely used in industry, petroleum, chemical industry, metallurgy, machinery, etc. Product features all know what the user specific? The following project is to introduce specific.

product characteristics of armored thermocouple

armoured thermocouple temperature measurement is the most widely used in the temperature of the device, his main characteristic is the wide temperature range, stable performance, at the same time, simple structure, good dynamic response, more can far eastone - 4 20 ma electrical signals to facilitate automatic control and centralized control. Thermocouple temperature measurement principle is based on thermoelectric effect. Connect the two different conductor or semiconductor into closed loops, when the two contacts in temperature is not at the same time, the circuit will produce thermoelectric potential, this kind of phenomenon called the thermoelectric effect, also known as the seebeck effect. There are two kinds of closed loop of thermoelectric potential of electric potential; The thermoelectric potential and contact potential. Thermoelectric potential means the same at both ends of the conductor potential because of the different temperature, different conductors with different electron density, so they produced by electric potential is not the same, the contact potential as its name implies is refers to the two different conductor in contact, because of their different electron density so produce certain electronic diffusion, when they reach a certain potential, which is formed by the balance after the contact potential depends on the size of the two different conductor material properties and their temperature contact point.

the international application of thermocouple with a standard specification, the regulations 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.

armoured thermocouple galvanic couple, 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. Compensation and thermocouple wires of the wire are generally not very clear, the positive connection of the thermocouple compensating lead 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