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With the continuous development of hydrogen energy and the gradual improvement of the hydrogen industry chain, countries are paying more attention to the quality of fuel hydrogen. The quality of hydrogen has a significant impact on the performance and lifespan of fuel cell engines. During the use of hydrogen, sampling and testing must be carried out to ensure that the fuel hydrogen used meets the standards for fuel cell engines. 70Mpa portable gas hydrogen sampling system, directly sampling from the hydrogenation port of the hydrogenation machine, ensures safe and reliable sampling, and the sampling is representative.