The measuring junction is the critical point in a thermocouple where two dissimilar metal wires are fused to generate a temperature-dependent voltage signal.
The measuring junction, also known as the hot junction or sensing junction, is the fundamental component of a thermocouple where two dissimilar metal or alloy conductors are permanently joined, typically by welding, brazing, or twisting. This junction produces a Seebeck voltage proportional to the temperature difference between the measuring junction and the reference junction, enabling precise temperature measurement in industrial applications.
诱因 → 失效模式 → 工程缓解
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Grounded junctions have the thermocouple wires welded to the sheath, providing faster response but risk electrical noise. Ungrounded junctions are insulated from the sheath, offering electrical isolation but slower response.
Smaller junctions have faster response times but lower mechanical strength. Larger junctions are more durable but respond slower and may not accurately measure small or rapidly changing temperature points.
Typically not—damaged junctions usually require complete thermocouple replacement. Junction integrity is critical for accurate Seebeck voltage generation.
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