Low temperature refrigerated containerIt is a key equipment used in laboratories, medical facilities, and industrial fields for storing biological samples, vaccines, drugs, and special materials. Correctly setting the temperature and storing items properly can not only ensure storage quality, but also extend equipment lifespan. The following is a standardized explanation from three aspects: temperature setting, item classification and storage, and operating precautions.
1、 Temperature Setting Specification
Set temperature based on the type of stored item
Biological samples/vaccines: Usually require an ultra-low temperature environment of -20 ° C to -80 ° C (such as -70 ° C for storing virus samples), and medical grade low-temperature refrigerators with independent temperature recorders should be selected.
Drugs/reagents: Most drugs require refrigeration at 2 ℃ to 8 ℃ (such as insulin and antibiotics), while some special drugs (such as freeze-dried powder) may require an environment below -20 ℃.
Food/industrial materials: Ordinary food refrigeration (0 ℃ to 4 ℃), special materials (such as electronic components) may require low temperatures below -40 ℃.
Reference standard: Follow the regulations on drug storage temperature in the Chinese Pharmacopoeia, or refer to the recommended temperature range in the equipment manual.
Temperature setting steps
First start-up: After connecting the power, adjust the temperature controller to the target value (such as -20 ℃) and wait for 24 hours to stabilize the temperature inside the box.
Dynamic adjustment: Adjust the temperature setting value (± 1 ℃ to ± 2 ℃) according to changes in environmental temperature (such as high temperatures in summer) or changes in storage capacity.
Avoid frequent adjustments: Daily temperature fluctuations should be ≤ ± 3 ℃, frequent opening and closing of the box door or temperature adjustments will accelerate compressor losses.
Temperature monitoring and recording
Built in sensor: Regularly check whether the temperature of the display screen is consistent with the actual storage area temperature (error should be ≤± 1 ℃).
External recorder: Use an independent temperature recorder for key samples (such as cell lines), record data every 30 minutes, and store it for at least 6 months.
Alarm setting: Enable the over/low temperature alarm function, with the alarm threshold usually set to ± 2 ℃ (e.g. target temperature -20 ℃, alarm range -18 ℃ to -22 ℃).
2、 Storage Techniques for Items
Classification storage principle
Partition according to temperature requirements: Store items that require -20 ℃ and -40 ℃ in different compartments to avoid cross contamination.
Sort by perishability: Place perishable items (such as enzyme preparations) near the air outlet to ensure rapid cooling.
Use specialized containers:
Biological samples: Use well sealed cryovials or cryovials, label the sample name, date, and operator information.
Drug: Store in its original packaging and avoid direct exposure to cold air after opening.
Food: Use food grade plastic bags or containers to prevent moisture evaporation and spoilage.
Storage quantity control
First loading: The first time the item is placed, it should not exceed 1/3 of the box capacity. After the temperature stabilizes (usually 4-6 hours), gradually add it.
Maximum load: The storage capacity should not exceed 80% of the box capacity, leaving space to ensure the circulation of cold air.
Avoid stacking: Keep items at least 5cm away from the box wall and air outlet to prevent obstruction and local temperature anomalies.
Special item handling
Glassware: Wrap with foam or sponge to prevent cracking at low temperature.
Liquid samples: stored in anti tipping brackets to avoid tilting and leakage.
Large volume items: Pre cool to the target temperature 24 hours in advance, then place in the refrigerator to reduce temperature fluctuations.
3、 Operation precautions
Standard for opening and closing doors
Single door opening time: ≤ 60 seconds. Frequent or prolonged opening can cause the temperature inside the box to rise by 5 ℃ to 10 ℃.
Door opening frequency: ≤ 5 times per day, plan the required items before picking them up to reduce ineffective operations.
Emergency door opening: If the box door freezes and cannot be opened, do not forcefully pry it. Use warm water to water the door gap (avoid direct contact with electronic components).
Temperature anomaly handling
Overtemperature alarm: Immediately check if the door is tightly closed and if the refrigeration system is blocked. If it is not restored within 3 hours, transfer the item and contact after-sales.
Low temperature alarm: Check if the temperature setting is too low or if the ambient temperature is too low (such as equipment not preheated in winter).
Continuous fluctuation: If the temperature fluctuates within the target range of ± 5 ℃ for more than 2 hours, the compressor or condenser needs to be stopped for inspection.
Long term suspension management
Empty the box: Before use, remove all items and wipe the inner walls with a neutral cleaner to keep them dry.
Power off treatment: Cut off the power, but keep the door gap slightly open (supported by wooden strips) to prevent mold growth.
Regular power on: Run for 12 hours every month to avoid compressor lubricating oil solidification causing malfunctions.
4、 Frequently Asked Questions and Answers
Q: What if the temperature display is normal, but the item freezes over?
A: Check if the item is in direct contact with the air outlet, adjust the storage position or add partitions.
Q: How to deal with severe frosting in refrigerated containers?
A: Manually defrost once a month (naturally melt after cutting off the power), avoid using hard objects to scrape the defrost layer.
Q: Can items outside the specified temperature range be stored?
A: Strictly prohibited! Storage beyond the designated range may result in item failure or equipment damage, therefore, it is necessary to choose a refrigerator with the corresponding temperature model.
Summary:Low temperature refrigerated containerThe temperature setting and storage of items must strictly follow the principles of "classification, quantification, and monitoring", and develop operating procedures based on equipment characteristics and storage requirements. Regular maintenance and standardized use can significantly improve storage efficiency and reduce the risk of failure.