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What is the method for checking the liquid nitrogen in the liquid nitrogen tank

Edit: Henan Tianchi Instrument Equipment Co., Ltd    Date:2019-02-11
The amount of liquid nitrogen in the liquid nitrogen tank should be recorded and inspected from time to time. Under normal circumstances, when the liquid nitrogen amount is reduced to 1/3 of the total capacity, liquid nitrogen should be replenished.
There are three methods for checking the amount of liquid nitrogen:
1. Weighing method: Weigh the weight of the liquid nitrogen tank in time, then take the total weight minus the net weight of the container
2. Wood stick method: insert the solid plastic stick or the solid small stick into the bottom of the liquid nitrogen tank, and take it out after 5-10s. The length of the frost is the liquid level.
3. Observation method: When it is found that there is sweating around the neck of the liquid nitrogen tank or the adhesion of hoarfrost, it proves that the vacuum degree of the liquid nitrogen tank has deteriorated and can no longer be used, and should be replaced immediately.