The use of the platinum-rhodium thermocouple main environment what

When it comes to the working principle of the platinum rhodium thermocouple believes that many friends are all know, the first platinum rhodium thermocouple conductor is mainly composed of two different components, will be combined into loop at both ends, when the two junction temperature in different time, so will appear thermal current in the circuit. But when the thermocouple in the end, there is difference in temperature, as well as reference end display instrument will comment the thermocouple, produced by the thermoelectric potential value of the corresponding temperature. If measuring the temperature of the normal remain at 1000 ℃ Before 1300 ℃, small make up recommend is you can use a single platinum-rhodium thermocouple, and the measurement of the temperature is at 1200 ℃ Is between 1600 ℃, can choose double platinum rhodium thermocouple, in this case, to ensure that the use of temperature in the range, and ensure the platinum-rhodium thermocouples throughout life. Platinum rhodium thermocouple in the entire series, with the accuracy, and stability performance is very good also, the main or wide temperature range of temperature measurement of parity, so go on using life is long, and is the temperature limit is higher, these are the main factors of platinum-rhodium thermocouple. Platinum rhodium thermocouple is suitable for use in a inert and oxidizing atmosphere, but also can use in a vacuum atmosphere in the short term, but is not suitable for use in containing metal, reducing and nonmetal steam atmosphere. And the advantages of platinum-rhodium thermocouple is, do not need to use the compensation of wire for compensation, because in the thermoelectric potential within the specified range will be smaller. And the disadvantage of platinum-rhodium thermocouple is, thermoelectric potential rate is small, so the sensitivity will be low, if it is at high temperature, the mechanical strength will decline, the pollution is very sensitive, because of the precious metal materials are expensive, so a one-time investment is larger.