Solve the thermocouple thermometer problem!
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There are two adjacent thermocouple thermometers; when one of them’s temperature rises, it is more than ten degrees higher than the other, while when their temperatures drop, they are roughly the same. The thermometer with abnormal temperature is the one on the front, and the one with normal temperature is the one on the back. The tests show no problems, but could experts help me figure out what’s going on? Thank you very much!
It means the upward movement earlier was relatively fast
Check the temperature sleeves; those with a rapid rise in temperature may have better heat transfer performance, or the sleeves may be worn thin.
Guessing if it’s the reactor inlet? Different thermodynamic fields of the fluid cause this inconsistency, and it becomes less noticeable as the temperature rises.
Being adjacent does not mean that the temperatures at the measurement points are close to each other; even the inside and outside of a kettle are adjacent, yet there is a big difference in temperature.
Check the insertion depth, the condition of the sleeve, and whether there are any differences in the installation positions at the front and back (corners, drainage channels, dead zones)