The Construction and Application of Thermocouple
The construction of the type of galvanic and its use?
Thermocouple K type (nickel-chromium-nickel-silicon) WRN series, N-type (nickel-chromium-nickel-silicon-magnesium) WRM series, E-type (nickel-chromium-copper nickel) WRE series, J type (iron - copper nickel) WRF Series, T-type (copper-copper-nickel) WRC series, S-type (platinum and rhodium 10-platinum) WRP series, R type (platinum and rhodium 13-platinum) WRQ series, B type (platinum rhodium 30-platinum rhodium 6) WRR series Wait.
① high precision measurement: thermocouple and the measured object indirect contact, not affected by the two media.
③ measurement range: thermocouple from -40 ~ +600 ℃ can continue to temperature.
1, the advantages of thermocouple:
④ strong function, good mechanical strength.
② hot response time: thermocouple on the temperature changes are flexible.
⑤ long life, easy to install.
2, thermocouple varieties and structure:
K-type thermocouple is a temperature sensing element, which converts the temperature signal into a thermoelectromotive force signal, through the electrical instrument into the measured medium temperature. The fundamental principle of thermocouple temperature measurement is the homogeneous conductor of two different components to form a closed loop, when the temperature gradient at both ends, the circuit will have a current through, then both ends with Seebeck electromotive force - thermoelectromotive force , Which is the so called Sebeck effect. Two different components of the homogeneous conductor for the hot electrode, the higher the temperature of the end of the task side, the lower end of the temperature is the free end, free end is generally at a constant temperature. According to the thermoelectromotive force and temperature as a function of contact, made thermocouple indexing table; indexing table is the free temperature at 0 ℃ under the conditions of the loss of different thermocouples with different indexing table. In the thermocouple circuit access to the third metal data, only the two contacts of the temperature of the opposite, the thermocouple occurs thermoelectric power will remain unchanged, that is not the third metal access circuit in the impact The Therefore, the thermocouple temperature measurement, access to measuring instruments, measured thermoelectromotive force, you can know the temperature of the measured medium.
