Thermocouples have the advantages of high precision and high price. Because they are widely used in people's normal production and career, they are familiar to large users. As a loyal user of thermocouples, they should properly learn some methods to accurately apply thermocouples. .
1. The index number of the thermocouple must be different from the thermocouple requested by the temperature measurement and control instrument taken;
2, the position of the device thermocouple should be separated from the strong electromagnetic field as much as possible, avoiding the power line of the power , so as to avoid the introduction of additional interference signals.
3, the fair choice of thermocouple outer tube material and outer diameter is small, to ensure sufficient strength, and to comply with the atmosphere of the situation. The name of the outer tube should be kept clean, the nominal stain will increase the thermal resistance, and the measured temperature will be lower than the actual temperature;
4, the thermocouple can not be long-term task at the highest agreed temperature, otherwise it will form a change in the amount of thermocouple material, resulting in increased measurement bias. In order to reduce the thermal inertia of the thermocouple when measuring high temperature, a bottom-type or out-of-head type thermocouple may be adopted;
5. It should be often reviewed whether the electrode and the outer tube can be prepared. If the diameter of the invention is thinner or the name of the outer tube is severely corroded, the application should be terminated and the new thermocouple replaced. After the thermocouple is destroyed, the damaged end can be lost. Perhaps the measuring end is replaced with the reference end, and the new welding can be applied continuously after verification.
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