Platinum rhodium thermocouple is also called high temperature thermocouple, precious metals platinum rhodium have single platinum rhodium (10 - platinum rhodium platinum rhodium) and double platinum rhodium (30 - platinum rhodium platinum rhodium 6), as temperature measurement sensor, usually with temperature transmitter, controller and display instrument, such as process control system, to directly measure or control in the production of a variety of fluid over a range of 0-1700 ℃, steam and gas medium and solid surface temperature.
WRP platinum-rhodium thermocouple, reliable quality, guaranteed, platinum, rhodium is a kind of traditional temperature measuring element, a thermoelectric performance stability, oxidation resistance is strong, the long-term use of temperature is 1600 ℃, short-term use temperature is 1800 ℃. The 99 corundum protective cover is applied outside, and the inner part is high-purity platinum rhodium alloy wire, which has high temperature resistance, accurate temperature measurement and high precision.
Use the temperature for - 200 ~ 1300 ℃. Platinum rhodium thermocouple has advantages of good linearity, thermoelectric emfs, high sensitivity, stability and good uniformity, oxidation resistance is strong, cheap, is not affected by short-range ordering etc, and its comprehensive performance is better than that of K type thermocouple, thermocouple is a kind of very promising. N type thermocouple cannot directly at high temperature for sulfur, reducing or restore, alternating oxidation atmosphere and vacuum.
Therefore, EN and TN cannot be replaced. Iron - constantan thermocouple measuring temperature area is - 200 ~ 1200 ℃, but usually use temperature range of 0 ~ 750 ℃ J type thermocouple has advantages of good linearity, thermoelectric emfs is larger, higher sensitivity, stability and uniformity is good, the advantages of cheap, widely used by users. The pt-rhodium thermocouple can be used in vacuum, oxidation, reduction and inert atmosphere, but the positive iron oxidizes quickly at high temperatures, so the use temperature is limited and cannot be directly used in the curing atmosphere at high temperatures without protection.
Platinum rhodium thermocouple is 10%, platinum is 90%, negative pole (SN) is pure platinum, so it is commonly known as single platinum rhodium thermocouple. The thermocouple long-term maximum temperature of 1300 ℃, the highest short-term using temperature is 1600 ℃. S-type thermocouple has the advantages of highest accuracy, best stability, wide temperature range and long service life in thermocouple series. It has good physical and chemical properties, thermoelectric potential stability and oxidation resistance at high temperature. Due to the excellent comprehensive performance of pt-rh thermocouple, the pt-rh thermocouple is in line with the internationally used temperature scale.
