Ultra-low temperature freezers utilize a refrigeration cycle system consisting of a compressor, condenser, expansion valve, and evaporator. Cooling is achieved by compressing the refrigerant and reducing its pressure, allowing the evaporator to absorb heat from the interior. When evaluating the performance of an ultra-low temperature freezer, a comprehensive consideration should be given to factors such as the minimum cooling temperature, refrigeration technology, cooling speed, size, temperature uniformity and stability within the freezer, compressor noise level, and after-sales service capabilities, taking into account specific usage requirements and laboratory space layout. Furthermore, preventative cleaning and maintenance of ultra-low temperature freezers are crucial:
1. Inspection Items: Refrigerator surface, cooling fan, filter, etc.
Cleaning and Maintenance Requirements: Clean the exterior dust, cooling fan, and filter of the ultra-low temperature freezer according to the surrounding environment. Use clean water or a neutral detergent, then rinse thoroughly with clean water.
Precautions: Avoid corrosion of the freezer's surface components.
2. Inspection Items: Refrigerator surface, cooling fan, filter, etc., including the condenser, circuit control compartment, refrigeration system component compartment, etc.
Cleaning and Maintenance Contents and Requirements: Regularly use a soft-bristled brush and a powerful vacuum cleaner to clean and maintain the internal circuitry components, refrigeration system components, and the surfaces of parts such as the compressor, cooling fan, condenser, oil separator, and dryer filter.
Precautions: Do not use water during cleaning. Avoid damaging the condenser fins and internal circuitry components.
3. Inspection Contents: Sealing rings and sealing performance.
Cleaning and Maintenance Contents and Requirements: Inspect and maintain the sealing rings, ensuring good sealing performance, appropriate magnetic suction force, and no ice buildup at the refrigerator door seams.
Precautions: Avoid frequent opening and closing of the refrigerator door to ensure a good seal.
4. Inspection Contents: Cabinet and battery.
Cleaning and Maintenance Contents and Requirements: Remove ice and frost from the interior of the ultra-low temperature refrigerator and ensure the alarm battery's charging and discharging functions are normal.
Precautions: Replace the battery promptly if it cannot charge and discharge normally.