The structure of thermocouple requirements and use the matters needing attention

In order to guarantee the thermocouple is reliable, steady work, must ensure that its structure is reasonable. Then, the structure of the thermocouple shall meet the requirement which? First of all, the two hot electrode welding must be strong; And two hot electrode should be well insulated between each other, in case of short circuit. In addition, the compensating conductor and the free end connection should be stable and reliable, and more convenient.

in addition, in the composition of thermocouple, the protection tube should be able to make hot electrode is separated from harmful medium to full effect. In fact, this product belongs to a kind of energy converter, it converts heat into electricity, using thermoelectric potential generated by the temperature measurement.

it is important to note that in order to satisfy the use requirement, thermocouple thermoelectric potential for his work on both ends of the temperature function of the poor, rather than the cold end and work side, the function of temperature difference on both ends. In addition to pay attention to the size of the thermoelectric potential. Under normal circumstances, when the material is uniform, the size and length and diameter of thermoelectric potential has nothing to do, and only depends on the composition of the material and at the ends of the temperature difference.

it is important to note that the two thermocouple wire material composition was determined, is the factors which influence the thermoelectric potential size of a temperature difference. If the cold end temperature keeping, the thermoelectric potential is just the end temperature of single value function. Now the products are mainly divided into two categories, one type is standard, the other is the standard.

the so-called standard thermocouple is mainly refers to, in accordance with relevant provisions of the relevant products, in this kind of product, the thermoelectric potential relationship with temperature, permissible error meet certain standards, but also has a unified standard score table of the thermocouple, and the matched the display instrument to choose from.