Five aspects teach you how to use thermocouples correctly

The thermocouple is a product with high accuracy and good economic efficiency in the development of measuring sensors. Therefore, it has become a very wide type of temperature measuring elements that we currently use. It directly measures the temperature and converts the temperature signal into The thermoelectromotive force signal is converted into the temperature of the measured medium through an electrical instrument (secondary instrument). In order to improve the accuracy of the measurement, reduce the error in the measurement, and prolong the service life, the user must not only have the instrument operation skills, but also have knowledge of physics, chemistry and materials. Based on years of field practical experience, Beijing Haohaiyuntian will introduce the measurement errors of thermocouples and their precautions in more detail here, so that everyone can use thermocouples better. In the process of using thermocouples, the following 5 issues should be paid attention to: 　　 1. The graduation number of the thermocouple must be consistent with the thermocouple required by the temperature measurement and control instrument used; 　 2. Reasonably choose the material of the thermocouple outer sheath, The size of the outer diameter, to ensure that there is sufficient strength, and to adapt to the ambient gas under test. The surface of the outer casing should be kept clean. If there is dirt on the surface, the thermal resistance will increase, and the measured temperature will be lower than the actual temperature; 　　3. Power cord, so as not to introduce additional interference signals to the temperature measuring instrument; 　　4. The thermocouple cannot be operated at a high allowable temperature for a long time, otherwise the material of the thermocouple will change, which will increase the measurement error and damage the thermocouple. When measuring low temperature, in order to reduce the thermal inertia of the thermocouple, you can use the bottom-touch type or the outcrop type thermocouple; 　　 5. Always check whether the electrode and the outer tube are intact, if the local diameter is thinned or the outer tube surface is severely corroded, etc. Phenomenon, stop using it immediately and replace with a new thermocouple. After the thermocouple is damaged, the damaged end can be removed, or the measuring end and the reference end can be swapped and re-soldered, and it can be used after verification.

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