COT surface cracking furnace dedicated thermocouple industrial development in the ethylene pyrolysis furnace outlet temperature (the temperature COT), COT controlled temperature with an accuracy related to ethylene cracking severity and recovery efficiency, is an important control parameter. Since the cracking furnace outlet temperature, flow speed, multi-sheathed thermocouple principle, the general temperature sensor life can only be 12-18 months. In recent years manufacturers not be eroded to the temperature sensor, multi-sheathed thermocouple, the choice of surface temperature in the furnace tube, this temperature measurement method solves the erosion problem, but delays and by the temperature difference between the outside temperature effects are can not really accurately reflect the temperature of the furnace tube, to reduce energy consumption to bring potential problems. I founded the company since the beginning of the COT thermocouple Improvement, imported special materials, changing the original pipe structure according to the fluid theory, the use of sophisticated process, has several improvements. Last successfully applied to the cracking furnace means close to the process requirements, how much money multipoint sheathed thermocouple temperature uniformity ± 3 ℃, accuracy of 0.4%, the service life of up to four years. Tungsten rhenium thermocouple temperature tolerance: 1300 ~ 1700 ℃ temperature tolerance of 0.5% |t| 0 ~ 2300 ℃ tolerance of 1% |t| temperature insulation resistance: tungsten-rhenium thermocouples in the ambient air temperature of 20 persons 15 ℃ relative humidity less than 85%, the insulation resistance between the electrode and the outer protective tube heat should be greater than 100MΩ.m. Four, WRe 3 / WRe25 external thermocouple protection tube: (l) silicon carbide tube (Sic) 1600 ℃ or less can be used in an oxidizing atmosphere (2) molybdenum disilicide tube (Mosi2) air and some of the following 1600 ℃ These corrosive atmosphere in use (supply agreement) (3) molybdenum tube (Mo) use (supply agreement) or less in 2300 C in vacuum (4) Tantalum tube (Ta) use (supply agreement) at 2300C or less vacuum more Point sheathed thermocouple sales, Anhui Electric Group, multi-sheathed thermocouple provided by the Anhui Electric Group Company Limited. Anhui Electric Group Co., Ltd. (www.ahecable.com) is Chuzhou, bare wires and bare conductor products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Anhui Electric Group leadership with the staff warmly welcome all inquiries negotiations to create Anhui Electric Group, a better future.