An ultra-low temperature refrigerator is a refrigerator that can provide an extremely low temperature storage environment. It can usually provide an extremely low temperature environment such as -40°C and -80°C, and is used to store biological samples, medicines, food and other items that require low temperature storage.
Ultra-low temperature refrigerators are usually composed of compressors, refrigeration systems, control systems, working chambers, and feeding and discharging devices. The compressor and refrigeration system cool the air to a set ultra-low temperature, thereby keeping the temperature inside the refrigerator below the set temperature. The control system can precisely control parameters such as temperature, humidity, and time to meet the storage needs of different items. The design and construction of the working room and the feeding and discharging device will also vary according to different usage scenarios and item requirements.
common problem
The temperature reading is inaccurate.
The temperature is unstable.
The cooling effect of the device is not good.
Frost or ice is too thick inside the refrigerator.
An error occurred in program operation.
Solution
Temperature Calibration: Place the thermometer in the ULT freezer and set the freezer to a known temperature. After waiting a while, compare the thermometer reading with the temperature reading displayed by the refrigerator. If there is a difference, a calibration adjustment is required. Calibration can be performed by adjusting the temperature calibration parameters in the controller.
Equipment Stability Calibration: Place thermometers at several locations inside the refrigerator and set the refrigerator to a known temperature. After waiting for a period of time, compare whether the readings of each metering point are consistent. If there is a difference, a stability calibration adjustment is required. This can be achieved by adjusting how and where heating, cooling and fans work, as well as adjusting condenser and refrigerant usage.
Equipment cooling effect calibration: set the ultra-low temperature refrigerator to the lowest temperature, wait for a period of time, and check whether the temperature inside the refrigerator reaches the preset temperature. If not, cooling effect calibration adjustment is required. The cause of the problem can be determined by checking the use of components such as condensers, refrigerants, and compressors, and checking whether the insulating materials and sealing performance are good.
Frosting inside or too thick ice layer: Frosting inside the ultra-low temperature refrigerator or too thick ice layer will affect the cooling effect of the refrigerator. The treatment methods include regular defrosting, checking the sealing performance, and ensuring that the door is tightly closed, etc.
Error handling in program operation: If an error occurs in program operation, it is necessary to reset the program or adjust the parameters in the controller.
North and South Chao reminds you: Ultra-low temperature refrigerators need to be calibrated and maintained regularly. At the same time, it is necessary to regularly clean the interior of the equipment, check the performance and condition of heating, cooling, control, sensors and other equipment, and replace or repair problematic parts in time. In addition, it is recommended to carry out maintenance according to the operation manual of the equipment and the maintenance to ensure the long-term stable operation of the equipment.
Precautions
In the process of using ultra-low temperature refrigerators, you also need to pay attention to the following points:
Reasonably arrange the placement of the samples to ensure that the samples can be cooled and kept at a uniform temperature.
Do not accumulate too many sundries or samples inside the refrigerator, so as not to affect the operation of the equipment and the accuracy of the data.
According to actual needs, the temperature range and accuracy of the refrigerator should be reasonably selected to avoid poor sample preservation due to mismatching equipment parameters.
During the use of equipment, record temperature changes and test data in time, and analyze and process them as needed.
In conclusion, the ultra-low temperature refrigerator is a commonly used biological and medical storage device, but it is necessary to pay attention to the use and maintenance of the device during use to ensure the stability of the device and the quality of the preserved samples.
