Liquid Nitrogen Tank Of Use Maintenance
           1) liquid nitrogen tank only used to hold liquid nitrogen, does not allow the cost of other liquids;
           2) check the inside of the container before the use of clean and dry;
           3) before filling liquid nitrogen with a small amount of liquid nitrogen pre-cooling;
           4) for long-term storage, you need to regularly add liquid nitrogen, the timing of the general should be in the remaining amount of liquid nitrogen for the total capacity of one-third is appropriate;
           5) is strictly prohibited in the container cover to place objects and sealed neck;
           6) into or remove the frozen items, try to make the mouth open time is short, in order to reduce the consumption of liquid nitrogen, do not put the barrel completely raised;
           7) to prevent the impact and collision;
           8) is strictly prohibited with a hard object to remove the frozen cream within the neck, so as not to damage the neck.