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How to use frozen liquid in liquid nitrogen tank

Edit: Henan Tianchi Instrument Equipment Co., Ltd    Date:2019-02-18
In the operation, the staff usually refers to the frozen essence to the neck of the liquid nitrogen tank. After a short time, it is put back into the tank. After 15 to 20 seconds, it is lifted up and then operated. Why do you want to put the frozen essence back and bring it up again? The reasons are as follows:
The frozen essence is returned to the container in order to return the frozen essence to a low temperature state, but in actual operation, sometimes the expected effect is not achieved. Some researchers have tested the effect of this method on liquid nitrogen tanks filled with liquid nitrogen and low liquid nitrogen. The results show that the effect of this method is very low in the tank with low liquid nitrogen position, and the temperature gradually rises above -120 °C after the frozen essence is lifted back many times.
Summary: It is necessary to check the liquid nitrogen level in the liquid nitrogen tank at any time and add liquid nitrogen in time. If the liquid nitrogen level is too low or uncertain, and the lifting and lowering operations must be repeated, the operating time should be minimized and the re-cooling time in the tank should be extended.
How to use frozen liquid in liquid nitrogen tank