How should a low-temperature refrigerator be maintained on a daily basis?

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The maintenance of low-temperature refrigerators is crucial for extending their lifespan and ensuring proper operation. Inaccurate temperature control often leads to damage to the items stored, which has a significant impact on experimental results and thus hinders the smooth progress of research work. 1. Clean it once a month to maintain its cleanliness. Use a dry cloth to remove any minor dust from the inside and outside of the refrigerator as well as its accessories; if the refrigerator is very dirty, use a neutral detergent for cleaning, and then rinse thoroughly with pure water. However, do not flush water inside or above the refrigerator, as this will damage the insulation material and cause malfunctions. Compressors and other mechanical components do not require lubricating oil. Be sure to be careful when cleaning the fan at the back of the compressor. After cleaning, conduct a safety check to ensure that the refrigerator plug is properly inserted and not loosely connected ； Ensure the plug is not abnormally hot ； Ensure that the power cord and distribution cables at the back of the refrigerator are free of breaks and scratches. 2. Alarm activation – When an alarm is triggered, it can usually be checked through the following methods. 　　 First, check if there is a problem with the power supply or if the plug has been pulled out of the socket ； 　　 Second, check whether the internal thermometer is outside the appropriate range; in such a case, placing items inside will raise the temperature of the refrigerator and trigger the alarm ； 　　 Third, check whether too many items are placed at once. 3. The refrigerator does not cool properly. Check whether there is frost on the surface of the evaporator ； Has the refrigerator door been opened and closed too frequently? ； Is the back of the refrigerator in contact with the wall? ； Are too many items being included? 4. Excessive noise from the refrigerator: Check whether the bottom plate is secure ； Is the refrigerator stable ； If it is not stable, adjust the adjustment screws so that the four corners are firmly supported on the base plate ； Is there anything touching the back of the refrigerator? 　　 If the cooling effect is poor, the refrigerator does not shut down, the heat dissipation tubes are not hot, and there is a faint airflow sound from the evaporator, this is due to a severe shortage of refrigerant caused by a slow leak. In actual use, many other problems will also arise; solving such problems requires the continuous accumulation of experience in order to overcome obstacles and ensure that the ultra-low temperature refrigerator operates at its optimal level.