Thermocouple temperature measurement
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The temperature of K-type thermocouples fluctuates frequently, while the temperature of thermal resistance transmitters at the same location remains very stable. Could the experts explain the reasons for this phenomenon? Thank you
It might be a poor connection at the thermocouple terminals； Damage at the connection wire causes grounding ； Electromagnetic interference.....
1. Check whether the terminals are loose. 2. Is the mv value output by the thermocouple normal? 3. Is the thermocouple damaged? 4. Is water entered into the sleeve?
If poor contact is ruled out, it could be that there is a leak in the protective sleeve, or there is a problem with the thermal contacts.
1. Check the core. 2. Check the wiring terminals (skip the wiring terminals). 3. Check the safety gate compensation terminals. 4. Check for high-voltage interference on site
Do you have any extra wires? Try using a different temperature-sensitive module.
Specific data is needed – what is the range of fluctuations? You can try using a different thermocouple. Determine whether it is a problem with the thermocouple or the wiring.
It is caused by electromagnetic interference; millivolt signals are prone to interference, so pay attention to grounding as well.