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A thermocouple is a temperature sensing element and an instrument. It directly measures the temperature, and converts the temperature signal into a thermoelectromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument (secondary instrument). The basic principle of thermocouple temperature measurement is that two different material conductors form a closed loop. When there is a temperature gradient at both ends, a current will flow through the loop. At this time, there is an electromotive force-thermoelectromotive force between the two ends, which is The so-called Seebeck effect consists of two homogeneous conductors with different components as the hot electrode, the end with a higher temperature is the working end, and the end with a lower temperature is the free end, and the free end is usually at a constant temperature.
Fusion machine XRF analysis equipment for sample preparation by glass fusing method, and can also be used to prepare solutions for AAS and ICP analysis: the sample is assisted by a flux (such as lithium borate) in a platinum yellow crucible (generally platinum/gold) The mass ratio is 95/5) as a heat-conducting container, which is heated and melted at high temperature (the melting temperature is generally between 1050°C and 1300°C), and finally directly cooled to the bottom of the pot or molded to form a glass melt sheet. It effectively reduces the particle effect, matrix effect, mineral effect and other adverse factors of the sample during XRF analysis, and improves the accuracy of XRF. According to different heating methods, it can be divided into electric heating (silicon carbon rod or silicon molybdenum rod), high frequency induction heating and combustible gas heating.
