TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The system further comprises hydrogen supply line to supply hydrogen from the temporary storage tank to the reformer; a combustor mounted on the reformer to heat hydrogen fed into in the reformer, where the hydrogen heated by the reformer is passed through a hydrogen conversion reactor for preheating and the natural gas separated from hydrogen can not be passed through carbon monoxide analyzer along with hydrogen and is reused as fuel for combustor; a first temperature sensor arranged between reformer and hydrogen conversion reactor for measuring temperature range (160-180 degrees C) at the entrance of hydrogen conversion reactor to provide reference value for control unit to block first valve to control outflow of high purity hydrogen from temporary storage tank when system restarts after shutdown; a first valve arranged on the hydrogen supply line arranged between temporary storage tank and reformer to control the circulation of high-purity hydrogen gas to the reformer by blocking the inflow according to the measured value provided by first temperature sensor using control unit; a second temperature sensor arranged between hydrogen conversion reactor and pressure swing adsorption device for measuring temperature range (140-160 degrees C) at the outlet of hydrogen conversion reactor to provide reference value for control unit to block second valve to control outflow of high purity hydrogen from temporary storage tank; and a second valve arranged between hydrogen conversion reactor and temporary storage tank to control the circulation of high-purity hydrogen gas by blocking the inflow according to the measured value provided by second temperature sensor using control unit to stop circulation of the high purity hydrogen when the system achieves normal operation. Preferred Method: The method further comprises restarting the system after shutdown, comprising introducing hydrogen to reformer from the temporary storage tank through hydrogen supply line, heating hydrogen using the combustor, warming hydrogen in hydrogen conversion reactor. The method further comprises analyzing carbon monoxide concentration in the hydrogen gas and ensuring carbon monoxide concentration is less than 1ppm between steps of compressing hydrogen to high pressure and storing hydrogen in the hydrogen container.