Standard size for thermocouple wires?
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What are the standard dimensions for thermocouple tubes? What is the typical wall thickness?
For thermocouples, there are generally protection tubes and sheaths, and these depend on factors such as the voltage rating, installation threads, and any special requirements.
Agree with LS’s opinion! Thermocouples are generally referred to as “cases,” and they need to be selected and manufactured according to the pressure rating of the equipment and pipelines.