什么是热电偶？

热电偶是温度测量仪表中常用的测温元件，它直接测量温度，并把温度信号转换成热电动势信号，通过电气仪表（二次仪表）转换成被测介质的温度。各种热电偶的外形常因需要而极不相同，但是它们的基本结构却大致相同，通常由热电极、绝缘套保护管和接线盒等主要部分组成，通常和显示仪表、记录仪表及电子调节器配套使用。

Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It directly measures the temperature and converts the temperature signal into a thermoelectromotive force signal, which is converted into the temperature of the measured medium through an electrical instrument (secondary instrument). The appearance of various thermocouples is often very different due to needs, but their basic structure is roughly the same. They are usually composed of main parts such as thermoelectrodes, insulating sleeve protection tubes and junction boxes, usually with display instruments, recording instruments and electronic adjustments. Used in conjunction with the device.