求翻译：水电解制得的氢气的纯度可达到99.7%以上，其中的杂质主要是O2和H2O，有时还有微量的N2、CH4、CO等。采用催化脱氧—吸附干燥法纯化后，纯氢中残氧量＜1ppm,露点可达-60℃～-80℃，已能满足许多工业部门的需要，所以这种方法应用广泛。至于微量的N2、CH4等杂质，主要来自设备、管道的污染，只要采取必要的措施后，即可将氢气中的N2、CH4含量进一步降低。是什么意思？

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Water and electricity to the purity of hydrogen, which can reach more than 99.7 % of impurities mainly O H 2 and 2, and sometimes there are traces of O N CH , 2 4 , CO etc. catalytic converters used after purification Deoxygenation - adsorption dry law, pure hydrogen in oxygen residues < 1ppm, de

The water electrolysis system results in the hydrogen purity may achieve above 99.7%, impurity mainly is O2 and H2O, sometimes also has micro N2, CH4, CO and so on.After uses the catalyzed deaeration - adsorption drying method purification, in the pure hydrogen the remnant oxygen measures <1ppm,

Water electrolysis hydrogen purity can reach over 99.7%, one of the main is O2 and H2O impurities, and sometimes the tiny amounts of N2, CH4, CO, and so on. After purification by catalytic deoxidation-adsorption drying, remaining oxygen in pure hydrogen <1ppm, up to-60 ¡æ ~-80 ¡æ dew point, has b