1. Application: Cracking Furnace Thermocouple thermocouple protection tube with a special structure, so close to cracking tube inside without affecting the material flow. Suitable for ethylene cracking furnace production process temperature measurement and control. 2, the main technical parameters: Electrical outlet: M20x1.5, NPT1 / 2 connection Size: M27x2, NPT3 / 4 Protection: IP65 Explosion-proof grade: D‖CT6 Accuracy class: I grade platinum and rhodium 30 - 6 platinum and rhodium thermocouple ( B-type platinum-rhodium thermocouple) of precious metal thermocouples. Thermocouple wire diameter is defined as 0.5mm, tolerance -0.015mm, its positive (BP) in the name of the chemical composition of platinum and rhodium alloy, which contains 30% rhodium, platinum 70%, negative (BN) as a platinum-rhodium alloy, containing rhodium 6%, so-called double platinum and rhodium thermocouple. The long-term maximum temperature of thermocouple 1600 ℃, short-term maximum temperature of 1800 ℃. B-type thermocouple has the highest accuracy thermocouple series, best stability, temperature of wide-temperature, long life, the market price of tungsten-rhenium thermocouples, temperature upper limit advantages. Suitable for oxidizing and inert atmosphere, tungsten-rhenium thermocouples manufacturers, can also be used in a vacuum in the short term, but not for reducing atmosphere or containing metal or non-metal vapor atmosphere. B-type thermocouple an obvious advantage is no need to compensate with compensation wire, tungsten-rhenium thermocouples parameters, because in the range of 0 ~ 50 ℃ thermal EMF of less than 3μV. B-type thermocouple deficiency is that thermoelectric power, thermoelectric power is small, low sensitivity, reduction in mechanical strength at high temperature, tungsten rhenium thermocouples, very sensitive to contamination, precious metal expensive, so a one-time investment is large. Tungsten-rhenium thermocouples Model | Anhui Electric Group (certified) | tungsten-rhenium thermocouples 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.