, the advantages and disadvantages of platinum-rhodium thermocouple and working principle

Platinum-rhodium thermocouple advantages: in the whole series of thermocouple should be stability and accuracy, and the temperature measuring temperature range is very wide, so the service life of platinum-rhodium thermocouple is also very long, the upper limit of temperature measurement is relatively high, is suitable for use in a inert and oxidizing atmosphere, of course, also can be used in the short term in a vacuum, but is not suitable for use in contain metal, nonmetal, or a reducing atmosphere.

platinum-rhodium thermocouple drawback: platinum rhodium thermocouple disadvantage is its thermoelectric potential, because of its frequency of thermoelectric potential is small, and the sensitivity is low, if high temperature mechanical strength will appear obvious drop, the pollution of the environment is also very sensitive, and the manufacturing of precious metal materials on the price is very expensive, so the one-time investment will be very big. Platinum rhodium thermocouple is mainly composed of two completely different composition of conductor connected together, mainly is connected to the circuit, when two junction temperature is different, so will appear different thermal current inside loop, and platinum rhodium thermocouple and reference at the end of work when the temperature difference is maintained between the display of instrument will be caused by the direct instructions of the thermocouple thermoelectric potential value.