Armoured platinum-rhodium thermocouple is mainly used to measure the temperature of gas, liquid or solid at 0~1300℃ in high temperature occasions, usually used with measurement and control instrument, recorder, etc. Mainly used in glass, ceramics, iron and steel metallurgy, salt bath furnace and other occasions of temperature measurement. Armoured platinum-rhodium thermocouple is composed of thermocouple wire, protective sleeve and lead or junction box, and the protective sleeve is made of high temperature resistant material GH3030 or GH3039. The difference between armoured platinum-rhodium thermocouple and armoured platinum-rhodium thermocouple is that armoured platinum-rhodium thermocouple outer protective sleeve is made of metal material, its length is unlimited, in the process of transportation, delivery, installation and use can be free to bend and not easy to deformation and fracture; And platinum-rhodium thermocouple usually outer protective sleeve for ceramic tube and corundum tube, which is easy to fracture in the process of transportation, delivery, installation and use. In the application of temperature measurement, armoured platinum-rhodium thermocouple measuring temperature of 0~1300℃, and platinum-rhodium thermocouple can be measured 0~1600℃. Therefore, suitable thermocouple products should be selected according to different temperature measurement requirements on site. 1, protection tube diameter: ф 4 ф 5 ф 6 ф 8 2, material: GH3030 GH3039 3, precision grade: ⅱ 4, applicable thermocouple grading number: S type B type 5, armored length: > 300mm 4, model and measuring temperature range