Thermocouple temperature indication issue
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Our company uses a thermocouple to maintain the temperature at around 162°C under normal conditions; however, when the temperature rises, especially at noon, the temperature increases by a few degrees. What could be the reason for this? Is it related to temperature compensation? But there’s a problem with this single temperature point, and the instrument technicians have yet to resolve it. Please offer some guidance!
As the ambient temperature rises, the temperature of the medium being measured also rises
The temperature of the medium being tested does not change; the reading is on the high side, and it becomes higher around noon or 1 or 2 o’clock in the afternoon
Based on what is shown, I personally think it’s a problem with the cold-end compensation; check the cold-end compensation...
Check whether the compensation wire of this thermocouple is broken or the connection has come loose~~
Are you at the site or in the control room for this temperature change?
The detection position of the thermocouple is not insulated from the environment; it is in a state of equilibrium between being heated by the material and cooled by the environment. At noon, the ambient temperature rises and the cooling effect weakens, so the displayed temperature increases. Try to improve the insulation of this temperature probe from the environment and see
It’s only this one thermocouple that has a problem; the others are fine. It’s better to replace it with a new one to avoid hassle. It’s likely an issue with the cold-junction compensation wire, and that can’t be fixed either!
Gradually, there are issues related to the cold end – that is, deviations caused by the unstable temperature at the cold end. I recommend monitoring the temperature at the cold end when there are abnormalities in temperature. Add more air conditioners to maintain a constant temperature at the cold end.
The story of temperature change and compensation wires. . . Obviously, Wenchang is more beautiful