... IR Absorption Method, N for thermal conduction detection methodGas RequiredCarrier gas: Helium gas, purity 99.995%,(0.25± 0.01)Mpa,Combustion ... higher than 99.995%, 0.25±0.01 Mpa,Power gas: Compressed air or Nitrogen without water & oil.Furnace TypeDual Electric resistance ... control, there is a controllable closed system. So the air and residual gas of combustion could be purged by oxygen. The closed ...