What material filled inside the temperature-sensitive sleeve yields the best results?
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The integrated temperature variation at the site was due to the sleeve not being inserted into the pipe during construction, which resulted in lower measured temperatures; would filling the sleeve with engine oil improve the situation?
Try using heat transfer oil, or replace it with a probe that is longer
Filling anything doesn’t seem to work very well; if it’s not possible to replace the components, it is recommended to thicken the insulation around the pipe to reduce errors and get a value closer to the actual temperature
If this measurement point is crucial, it is recommended to drill a new hole nearby to install the instrument; if it’s not that important, just use it as is. As mentioned on the third floor, ensure that the insulation is of good quality
Just go back to work steadily; why bother?