Thermocouple temperature measuring effective place is where _ instrument1

Thermocouple temperature measurement is mainly use node temperature measurement, is the place where two thermocouple wire combination to measuring temperature. Thermocouple is when the thermocouple wire under the environment of temperature measurement may be limited by corrosion, and use other material to protect the silk, the thermocouple is called thermocouple as a whole. Two kinds of different ingredients of conductor ( Called the thermocouple wire or hot electrode) Two ends synthesis loop, when two junction temperature is not at the same time, in the circuit will generate electromotive force, this kind of phenomenon called the thermoelectric effect, and the electromotive force called thermoelectric potential. Thermocouple is the use of the principle of temperature measurement, which directly used for measuring the medium temperature is called at the end of the working side ( Also known as the measuring end) , on the other side called cold end ( Also known as compensation) ； The cold end connected to the display instrument or meter, display instrument will point out the thermocouple thermoelectric potential. Thermocouple is actually a kind of energy converter, it converts heat into electricity, using thermoelectric potential generated by the measuring temperature, the thermocouple thermoelectric potential, we should pay attention to the following questions: 1: thermocouple thermoelectric potential is thermocouple temperature on both ends of the work on the function of the poor, rather than the thermocouple cold end with the job, temperature difference on both ends of the function; 2: the size of the thermocouple thermoelectric potential produced by, when material is uniform thermocouple, has nothing to do with the length and diameter of thermocouple, only with the thermocouple at the ends of the material composition and temperature difference 3: when the two thermocouple wire thermocouple material component is determined, the size of the thermocouple thermoelectric potential, only related with the thermocouple temperature difference; If the thermocouple cold end temperature keeping, this into the thermocouple thermoelectric potential is only the end of the single value function of temperature. Two different welding material A conductor or semi-conductor A and B, form A closed loop. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, thus forming the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermocouple is in using this effect to work. The structure of thermocouple in order to keep the thermocouple is reliable, steady work, the structure of its requirement is as follows: (1) of the two thermocouple hot electrode welding must be strong; (2) two hot electrode should be well insulated between each other, in case of short circuit; (3) compensation conductor should be connected to the free cod of a thermocouple to be convenient and reliable; (4) protect casing thermal electrodes should be able to make sufficient isolation and harmful medium. Platinum rhodium thermocouple are suitable for all kinds of high temperature circumstance in the process of production, are widely used in powder metallurgy, bright sintering furnace, vacuum furnace, melting furnace, glass, ceramic and industrial salt bath furnaces and furnace temperature!