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bihl und wiedemann electrical components are commonly used temperature-sensing elements in temperature measurement instruments. They directly measure temperature and convert the temperature signal into a thermoelectric EMF signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument). The external shapes of various thermocouples often differ significantly depending on requirements, but their basic structures are largely similar. They typically consist of main components such as hot electrodes, insulating protective tubes, and terminal blocks, and are usually used in conjunction with display instruments, recording instruments, and electronic regulators. In industrial production processes, temperature is a