K type thermocouple temperature measurement principle

K type thermocouple temperature measurement must by thermocouple, connecting wires and display instrument of three parts. Thermocouple and temperature measuring thermocouple wire 1, if the hot end of K type thermocouple to heat, cold, hot on both ends of the temperature difference, in the thermocouple loop will produce thermoelectric potential, a physical phenomenon is called thermoelectric phenomena ( The thermoelectric effect) 。 The potential in the K type thermocouple loop consists of two parts, the temperature difference between potential and contact potential. Contact potential: it is two kinds of electron density difference between conductor touch each other during a thermoelectric potential. When the two different conductor A and B in contact, the electronic density hypothesis conductor A and B respectively Na and Nb and Na> Nb, the contact surface in two conductors, electrons in two direction dispersion rate is not the same, the number of the electrons by A dispersed to conductor B conductor than the number of the electrons from B to A. Conductor lose electrons and positive, A conductor B for electronic and negatively charged. So, in A, B two conductors of the contact surface and form A static electric field from A to B, the scattered electric field will hinder movement continued, accelerate electrons from moving in the opposite direction at the same time, multiply the number of the electrons from B to A, * after reach dynamic equilibrium. At this time also form A potential difference between A and B, the potential difference is called contact potential. This potential is only with the nature of the two kinds of conductor temperature contact point, when two conductor material, contact potential is only related to its junction temperature. The higher the temperature, the more active the electrons in A conductor, by A conductor to B the more electronic conductor, contact space of the greater the electromotive force, the contact potential. Dear customer: hello, our company is a strong technical force of the development of high quality, for the majority of users with high-quality products and complete solutions and the best technical services company. The main products are platinum rhodium thermocouple S type thermocouple sheathed thermocouples tungsten-rhenium thermocouples, etc. This enterprise uphold sincerity, with the purpose of the implementation of quality and with enterprising societe generale, with a firmer step climb the new peak unceasingly, contribute to national automation industry, welcome new and old customers to rest assured the choose and buy the desired products. We will serve you wholeheartedly!