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Precious metal sheathed thermocouple Problems and Solutions

Advanced temperature sensors. It is a precious metal hot electrode, insulator and metal packages hydroxide breakable protective tube, the composite drawing made of. Its performance with high accuracy and fast response, good thermal stability,[link widoczny dla zalogowanych], small size, not afraid of bending, rigid structure, high mechanical properties, seismic resistance,[link widoczny dla zalogowanych], high impact and so on. In the production and scientific research, the choice of display instruments and precious metal sheathed thermocouple connected to a continuous temperature measurement can be accurately realized, to facilitate the production and research conditions. At present, precious metal sheathed thermocouple the process more complicated, the price is also more expensive. Therefore, some manufacturers and individual users to create a number of non-precious metal sheathed thermocouple standard products; it is not only the accuracy of the low temperature, but also seriously affect the normal operation of industrial production. There are three kinds of market structure. The first form: the precious metal hot electrode, high-purity magnesium oxide insulation materials and precious metal jacket tube. Figure 1: Figure 1A sheathed thermocouple assembly drawing B sections that precious metal sheathed thermocouple, due to the elongation of 3 different materials, heat the electrode, between the insulation and the jacket tube, the compound La extension, they rub against each other to produce should be, made of thermocouple, it will affect the accuracy of thermocouple measurements. Therefore, during the design and development of the thermocouple types, we should pay special attention to these three kinds of materials, physical matching issues. The hot electrode and the outer armor materials are precious metals,[link widoczny dla zalogowanych], therefore, does not exist for this chemical is not relative to the thermocouple to learn. If the thermocouple in order to better improve the dynamic response speed, but also reduce the diameter of the thermocouple measuring end about 8% of the rolling method to be realized. The second form: the precious metal hot electrode, magnesium oxide insulation and inexpensive metal jacket tube. This type of thermocouple thermocouple While maintaining many of these characteristics, but there is a serious pollution problem in precious metal hot electrode. At high temperatures, due to cheap metal jacket tube material thermal diffusivity of molecules, resulting in the pollution hot electrode, thereby changing the potential value of the thermocouple, resulting in errors. The life of the thermocouple and the measurement accuracy. Solve the question of chemical incompatibility of materials approach are: ① the measurement end of the hot electrode coated with platinum foil. ② hot electrode measuring end use of plastic thermal insulation,[link widoczny dla zalogowanych], isolation package. Measuring end in order to prevent contamination. In order to avoid the physical matching between the thermocouple materials, caused by the error, should be considered a scientific mechanical properties of materials (ie, elongation and tensile strength) and other issues. The third form: the precious metal hot electrode, double and inexpensive high-aluminum tubes assembled metal stent. The thermocouple, sheathed thermocouple without any production of the package. Therefore, there are more problems, do not have the characteristics of armored thermocouple metals and performance. Such as: × × Co thermocouple belong to this type of product. In addition, in the assembly,[link widoczny dla zalogowanych], the hot electrode insertion depth of problems that still exist, tested, this difference between the thermocouple surpassed 4 ~ 6 ~ C. Therefore, can not reflect the true temperature of the measured medium. This is a real fabricated thermocouple. View of the precious metal armor on the market there are more problems thermocouple products, manufacturers should be sheathed in the manufacture of precious metal thermocouple, aware of the hot electrode, insulator, jacket tube matching between the physical and chemical compatibility issues; appropriate treatment and reasonable thermocouple structure, proper installation, accurate and timely calibration indexing, high-quality, high stability thermocouple. Identification of the user should increase the precious metal sheathed thermocouple product capabilities to better achieve corporate environment working temperature measurement. ~ 3O

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