Hydrogen is sampled to the hydrogen gas analysis system via sampling tube, in which the mini-lye drop is separated from it by the gas-moisture separator, then it goes into the online analyzer to check the O₂ content in hydrogen after its pressure will be reduced. Before the product H₂ is transmitted into the corresponding storage tank, it will be sampled into the separated moisture meter to measure their dew-point, the corresponding signal will be sent into programmable logic controller for display and monitoring. The control program will decide the product H₂ and product H₂ to be sent into their corresponding storage system or not, depending a certain conditions.