Protect casing will affect end thermocouple accuracy release time: 2019 - 06 - 04 viewed: zero

End of thermocouple is made of special material is made and be become, it is better than general thermocouple can rapidly and accurately reflects the actual temperature of the measured medium, therefore more suitable for measuring the bearing shell or other parts of the end surface temperature. But if it is installed in a protective sleeve tube thermocouple, so may cause errors in the process of temperature measurement, the error is mainly derived from end face thermocouple itself and the error due to protect casing. The error due to the protective casing mainly comes from three aspects: the hot spot of the thermocouple no into the protective sleeve tube department and closely contact with the end. Then by thermocouple temperature measurement is actually protective sleeve tube department of air inside the cavity temperature. Protect casing improperly installed, failed to ensure the hot spot of the thermocouple is located in the measured temperature range. The reason for this is to protect casing through long or inadequate, protect casing, improper installation Angle, etc. When measuring high temperature, protect insulation casing is exposed to the air in some wrong, due to its conduction measurement error. Generally speaking, the pipe center, the highest temperature and deviating from the pipe center after the temperature will decrease rapidly. So when installing a protective casing, demanding to slightly more than the end of casing pipe center to ensure the hot spot of end surface thermocouple located at high temperature, it makes the protection tube inserted into the pipe length is bigger. For the above problem, we as long as during the installation process in strict accordance with the rules for installation and then pay attention can be avoided, but for the protection of casing can't always change after installation, in the design process must be after careful consideration, to ensure the normal use of thermocouple.