Introduce the types and structures of thermocouples

Thermocouples can be divided into ordinary type, armored type, high-performance solid type and special type according to different structural forms. Ordinary thermocouple' target='_blank'>thermocouples are widely used. In general, this type of thermocouple should be selected. The selection of the protective tube material mainly considers the atmosphere, temperature, flow rate, corrosiveness, friction, and chemical adaptability of the material to be measured. Factors such as stress tolerance, stress tolerance, responsiveness, and cost-effectiveness. Afterwards, the diameter, wall thickness, length, air tightness and fixing method of the protective sleeve are determined according to the actual situation such as the structure and installation location of the measured object. Here, attention should be paid to the wall thickness (determining the wear resistance) and the heat capacity (determining the reflection time). In the case of meeting the wear resistance requirements, the wall thickness of the protection tube should be reduced as much as possible to improve the dynamic characteristics. If it is a high temperature environment with severe chemical damage, double protection tubes can also be considered. Armored thermocouples are widely used due to their advantages of flexibility, small diameter, wide adaptability, small heat capacity, fast response speed, long service life and arbitrary interception length, especially for deep temperature measurement points (such as boiler furnaces). some temperature points at the top) or places that need to be bent. The material, diameter and length of the protective tube are mainly considered when selecting the type. The high-performance solid thermocouple has the advantages of both the ordinary type and the armored type. It has high temperature resistance, fast response and long life. Its operating temperature is 100 °C higher than that of the same type of ordinary sheathed thermocouple, and its response speed is 6~8 faster than that of the ordinary type. times. The selection should be comprehensively considered, especially the price/performance ratio.

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