A brief introduction to the construction of common industrial thermocouples

Ordinary industrial thermocouples usually consist of several main parts, such as thermode, insulating tube, protective sleeve and junction box. A brief introduction to the construction of each part is now provided, the thermode The thermode, also known as the filament, is the basic component of the thermocouple. Ordinary metal wires are usually 0.5-3.2mm; wires made of precious metals are usually 0.3-0.6mm in diameter. The length of the filament depends on the depth at which the working end is inserted into the medium to be measured, usually 300 to 2000mm, and the commonly used length is 350mm. Insulation tube Insulation tube, also known as insulator, is used to protect between the hot electrodes and between the hot electrodes The insulating parts with the protective cover to prevent short circuit between the insulating layers. They are usually round or oval in shape, with 2, 4 or 6 holes in the middle, and the thermocouple wire is perforated. Depending on the thermocouple used, the material is clay, high alumina, corundum, etc. A protective sleeve A protective sleeve is a device used to protect a thermocouple sensing element from chemical and mechanical damage to the medium being measured. The protective cover should have the characteristics of high temperature resistance, corrosion resistance and good thermal conductivity. Materials that can be used as protective covers are metals, non-metals and cermets. The metal materials are aluminum, brass, carbon steel, stainless steel, etc. Among them, lCrl8Ni9Ti stainless steel is a typical material used in the current thermocouple protection sleeve. Non-metallic materials are high aluminum (Al2O3 mass fraction of 85%-90%), corundum (Al2O3 mass fraction of 99%), and the operating temperature is higher than 1300 ° C. The cermet material is magnesium oxide plus metal molybdenum.

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