For platinum rhodium thermocouple in working principle, how much you know

If two junction temperature is different, so will appear when circuit electromotive force, we call this phenomenon the thermoelectric effect, in which electromotive force is called thermoelectric potential, and platinum rhodium thermocouple is using the principle of temperature measurement, which directly used to measure temperature of medium we call the work end or at the end of the measurement, and the other side, we call it the cold end compensation or end of the cold end and display instrument as well as the matching between the instrument is connected, display instrument will directly to point out that the thermoelectric potential of platinum-rhodium thermocouple.

platinum-rhodium thermocouple is actually a kind of energy converter, and primarily converts thermal energy into electric energy, its produce thermoelectric potential is used for temperature measurement, platinum, rhodium thermocouple of thermoelectric potential in the following points need to note: a, platinum rhodium thermocouple thermoelectric potential is actually ends its work in the end a function of temperature difference, not platinum-rhodium thermocouple end and cold end temperature function of poor; Second, platinum rhodium thermocouple of the size of the thermoelectric potential, if platinum rhodium thermocouple used material is relatively uniform, so and platinum rhodium thermocouple diameter and length of the basic it doesn't matter, just and platinum rhodium thermocouple on both ends of material composition and the error between the relations; Three, platinum rhodium thermocouple after the main component of wire materials were determined, platinum, rhodium thermocouple thermoelectric potential size, actually only with difference in temperature, if the platinum-rhodium thermocouple cold end temperature keeps consistent, then the thermoelectric potential will only at work and functions related to the temperature, and the two different conductor material and connect, can form a closed loop.