The storage of biological samples is mainly in the liquid phase after the appearance of liquid nitrogen tanks.
With the increase of storage capacity and the expansion of application range, the liquid phase is no longer a single storage method, and the gas phase begins to appear!
This form of separation of liquid nitrogen and samples is applied to stainless steel cryogenic freezers for centralized and large-scale storage of biological samples, such as stem cells, blood, animal and plant tissues, etc., which often appear in large scientific research laboratories and preservation institutions.
The models from small to large are 350, 450, 550 liters; 750, 850, 1000 liters; 1300, 1600, 1800 liters. The number of stored samples increases with the increase of the model. The large model of 1800 liters can store nearly 100,000 biological samples . Most of the other small-capacity samples can store more than 10,000 pieces.
The reason why the model is so different from conventional liquid nitrogen tanks is that the standard for the manufacture of stainless steel cryogenic refrigerators – large-diameter liquid nitrogen biological containers GB/T 14774-2012 “, the standard stipulates that the effective volume shall not exceed 1830 liters, and the diameter shall not It is less than 315mm, and it is austenitic stainless steel, that is, 304 stainless steel material, which has the characteristics of normal pressure, pressure resistance, explosion-proof, and insulation to ensure the cooling effect.
Under these conditions, the model of KGSQ stainless steel cryogenic freezer is between 350-1800 liters and the diameter is 326-635mm. It supports gas-liquid dual mode, mainly in gas phase storage. Liquid nitrogen is under the sample to provide refrigerated nitrogen for the upper sample. , separated by trays in the middle, to avoid cross-contamination caused by a problem with a certain sample in bulk storage. At the same time, it has intelligent management and automatic rehydration system!