... of high temperature resisting material for thermowell, so they can work stably and chronically from 1800 oC ... the indicator of pressure raising rate. We can make sure the pressure raising rate of vacuum furnace is ... the wiring method w/strong seal performance, to make sure the pressure raising of thermocouple is less than ... 0.1 Pa/h, and this can make sure never destroy the vacuum in furnace. So, this ...