Thermocouple measurement junction where two dissimilar metal wires join to generate voltage proportional to temperature difference.
The measurement junction, also known as the hot junction, is the critical point in a thermocouple sensor where two dissimilar metal or alloy wires are fused together. This junction creates a Seebeck effect voltage when exposed to temperature gradients, serving as the primary temperature-sensing element. Its precise construction directly determines measurement accuracy, response time, and reliability in industrial applications.
诱因 → 失效模式 → 工程缓解
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Three primary types: Grounded junction (welded to sheath, fast response but electrically connected), Ungrounded junction (insulated from sheath, electrical isolation), and Exposed junction (direct contact with medium, fastest response but vulnerable).
Junction homogeneity, weld quality, and material purity directly impact EMF consistency. Imperfect junctions cause measurement drift, while proper fusion ensures stable Seebeck coefficient and calibration compliance.
Regular calibration checks, visual inspection for corrosion/deformation, and verification against reference standards. Contaminated junctions require cleaning or replacement to maintain accuracy.
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