The Subtronic Type D is a hydrogen purifier from Sertronic. It is capable of removing O2, CO, CO2, H2O impurities at a level of 1 ppb. The feed gas passes through its catalyst that converts oxygen into H2O. CO, It removes CO, CO2 and H2O using an adsorbent layer. It is generally used in the semi conductor industry, welding gases, metallurgical industry, as well as the glass industry