The thermocouple can be divided into ordinary, armor -type, high -performance solid and special types according to its structural design form. The general thermocouple is widely used, so the general thermocouple is usually selected. The selection of materials for protective pipes mainly consider the atmosphere, temperature, flow rate, corrosion and friction of the measured media, and the chemical adaptability, pressure resistance, resistance, response speed and cost performance of the chemical adaptability, pressure resistance, resistance stress, response speed and cost -effectiveness of the material.

You can then determine the diameter, wall thickness, length, gas tightness, and fixed working method of the protective cover according to the structure of the target structure and installation of a position. Here we must pay attention to the wall thickness (determine wear resistance), as well as the heat capacity (determine the reaction time). In order to improve the dynamic characteristics of the protective pipe, the wall thickness of the protector should be reduced as much as possible.

If it is a high temperature environment, the chemical injury is serious, and the double protection tube can also be considered. The armor thermocouple is widely researched and applied for its flexibility, small diameter, wide adaptability, small thermal capacity, fast response analysis, long life, and arbitrarily intercepting a length. (Such as some working temperature points on the top of the boiler) or bending.

When choosing, the material, diameter, length, and length of the protective tube are mainly considered. High -performance and solids can have the advantages of ordinary and armor -type through thermocouple, high temperature resistance, fast response, and long life. The working temperature of the thermocouple is 100 ° C higher than that of the same type of ordinary thermocouple, and the response speed is 6-8 times faster than that of ordinary thermocouple. The selection must be considered comprehensive analysis, especially for cost -effectiveness.