1. During the use of the jar, the use of the jar should be checked at any time every day. Under the premise of liquid nitrogen in the jar, if water drops or frost is found on the lid and the upper part of the jar, it indicates that there is a problem with the quality of the jar. Stop using it immediately;
2. When there are no drops of water or frost on the bottle cap and the upper part, touch the outer shell with your hands, and feel the upper part is cold and the lower part is hot, indicating that there are some problems with the quality of the jar, that is, the daily increase of liquid nitrogen is greater. You should pay attention to observation To prevent the stored material from being damaged after the liquid nitrogen is consumed, it is best to stop using it if necessary; if the upper and lower temperatures are consistent, it means that there is no problem with the quality of the jar.
3. After opening the stopper, the mist in the mouth of the bottle does not overflow, but sinks, indicating that the jar is good.
4. Use your ears to listen to the jar for bubbles from the mouth of the bottle. If it is more frequent, there is a problem with the quality of the jar, otherwise there is no problem.
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