Thermoelectric couple

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A thermocouple is a temperature element commonly used in temperature gauges that measures temperature directly and converts the temperature signal into a thermoelectric actuator signal, which is then passed through an electrical gauge (secondary gauge) to convert the temperature of the substance being measured. The basic structure of thermocouples is similar, and usually consists of thermoelectrodes, insulation tubes, wiring boxes and other main parts. They are usually equipped with indicators, recorders and electronic regulators. The features of thermoelectric generators include wide programmability, high accuracy, easy operation, strong durability and fast response. These features make thermal equipment widely applicable in the industrial field.

1. There are many types of thermocouples. The most common are standard thermocouples and non-standard thermocouples. Among them, the K-type thermocouple is a metal thermocouple with strong aerosol resistance, the median temperature of which can be measured from 0 to 1300°C, and it is suitable for continuous use in aerosol and inert gases. However, K-type thermocouples are not suitable for use in vacuum, sulfur-containing, carbon-containing atmospheres and in bare earth atmospheres with aerobic replacement. In addition, the advantages of thermoelectric couplings include high measurement accuracy, wide measurement range, simple construction and ease of use.

2.Thermoelectric couple is based on the principle of a plug effect. When two different material conductors are combined into a closed circuit, current flows through the circuit when the two ends have a certain temperature difference. Electricity--thermoelectricity. The magnitude of this electricity depends on the properties of the material itself and the temperature at which it is generated. It can be divided into two parts: contact electricity and temperature difference electricity. Contact potential is the potential difference caused by electron diffusion at the terminals due to the difference in the free electron densities of two conductors; temperature difference potential is caused by the difference in the free electron densities at the two ends of a metal conductor due to the difference in temperature.
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