Popular science that you don't knowLittle knowledge of liquid nitrogen machine

The liquid nitrogen machine must master the following points when using and maintaining the liquid nitrogen tank: Before using the liquid nitrogen tank in Sichuan, a small amount of liquid nitrogen should be injected into it to pre-cool it, and when the temperature in the tank reaches the liquid nitrogen temperature, fill it with liquid nitrogen until the tank is full. The liquid nitrogen machine should be handled gently to prevent collision and extrusion. When moving, it should not be dragged on the ground, but should be lifted. Usually stored in a dry, well-ventilated room to prevent moisture. When storing frozen semen, a certain volume of liquid nitrogen should always be kept in the tank, and it is advisable to completely immerse the frozen semen in liquid nitrogen.

There are two ways to measure the amount of liquid nitrogen: the wooden ruler measurement method is to take a wooden stick with a diameter of 5cm and a length of 80cm, paint it black after peeling it, and then set a scale every 5cm from one end. With the scale facing down, insert it from the liquid nitrogen tank mouth to the bottom of the tank, and take it out after 5-10 seconds. The length of the frosting is the liquid nitrogen capacity in the tank. nitrogen. It is necessary to check the neck plug and the small groove of the neck plug at any time, remove the ice on the neck plug in time, and do not place plastic cloth and other substances on the neck plug to increase the sealing and the performance of the liquid nitrogen machine .

When it is found that the liquid nitrogen consumption rate is too fast or there are water droplets around the neck of the liquid nitrogen tank, and white frost appears, it means that the insulation performance of the tank is out of balance and the liquid nitrogen cannot be stored. The specimens placed in the liquid nitrogen tank should be marked well, and the handling should be stable, accurate and fast. The inner cavity of the liquid nitrogen machine should be cleaned once a year to prevent corrosion of the tank wall. Before cleaning, the liquid nitrogen in the tank should be dried, and parked indoors for 2-3 days. After preheating to room temperature, brush with neutral washing powder, and then Rinse it with clean water and control it to dry. The temperature of the cleaning solution and water should not exceed 40 °C to prevent overheating from affecting the performance of the tank. Liquid nitrogen tanks should be transported and opened as little as possible. If you need to transport it, you must use a rope to fix it on the car box, keep it upright, prevent falling, overturning, lying down, and try to prevent violent vibration.