1, Liquid nitrogen is ultra low temperature products (-196 ℃), in use process to prevent frostbite.
       2, In the use and storage of liquid nitrogen in the room, to maintain good ventilation, to avoid the lack of space, causing suffocation.
       3, Transportation using transport containers, banning use of the storage containers.
       4, Liquid nitrogen container vacuum nozzle valve seals seals,can not damage.
       5, Liquid nitrogen container storage items for long-term preservation, should pay attention to the timely supplement of liquid nitrogen, liquid nitrogen level is not lower than refrigerated goods.
       6, Check the liquid nitrogen storage, can use weighing method, can also be fine wood, bamboo poles into the liquid nitrogen tank in the frost height (equal to the height of liquid level) method. But do not use a hollow tube insertion, in order to avoid the liquid nitrogen from the tube out of spatter wounding.