Thermocouple temperature measurement conditions

Thermocouple is a temperature sensing element, is a kind of an instrument, he can directly measure the temperature. Composed of two different composition material of the conductor closed loop, because material is different, different electron diffusion of electron density, stable equilibrium is produced after electric potential. When temperature gradient is at both ends, the loop will be current, produce thermoelectric emfs, the bigger the temperature difference, the greater the current will be. To know the temperature after the measured thermoelectric emfs. Thermocouple in practice is a kind of energy converter, convert heat energy into electricity.

so where is the technical advantage of thermocouple performance: the first is wide thermocouple temperature measurement range and stable performance compare; High measurement accuracy, thermocouple direct contact with the object being measured, not affected by the intermediate medium; Second is its thermal response time is fast, flexible thermocouple response to temperature changes; Wide measurement range, the thermocouple 40 ~ + 1600 ℃ can be continuous temperature measurement; Thermocouple performance is stable, good mechanical strength. Long use life, device for lunch.

thermocouples must be composed of two different nature but fit a certain request of conductor ( Or a semiconductor) Data constitute a loop. Thermocouple measurement must have a temperature difference between side and reference.

he needs to be two different materials of the conductor or semiconductor welding, A and B constitute A closed loop. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, therefore constitute the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermocouple is using this effect to work.