There are various types of refrigerated centrifuges; you should choose the one that best suits your specific needs.

　　 Frozen centrifuge Freezing is achieved through a temperature-control system. Typically, a frozen temperature-control system is used when the centrifuge operates at high speeds or when required by the user.

　　When the rotational speed is high, the rotor generates heat due to friction with the air during high-speed operation, making it difficult to maintain a stable temperature of the machine body. Excessively high temperatures can shorten the service life of the internal components of the centrifuge. This is precisely the key difference between a refrigerated centrifuge and a conventional centrifuge: a refrigerated centrifuge is equipped with a cooling system that allows precise temperature control and protects the machine’s components, whereas a conventional centrifuge does not have a cooling system.

　　In addition, according to the user’s experimental requirements, a low-temperature control system must be provided. For example, when separating certain organic active substances—such as enzymes or volatile organic compounds—a constant temperature or a temperature difference no greater than ±10℃ is required to ensure that the experimental conditions meet the design specifications and guarantee the smooth execution of the experiment.

　　The working principle of a refrigerated centrifuge consists of two main parts: the centrifugation section and the refrigeration section. It primarily comprises components such as a drive motor, drive circuit, display screen, compressor unit, steel frame, electronic door lock, and alloy rotor body. Through program settings, it can adjust the centrifugal speed, set the centrifugation time, and control the centrifugation temperature—these three fundamental parameters.

　　A refrigerated centrifuge, also known as a low-temperature centrifuge, comes in many types available on the market. Common classifications include low-speed refrigerated centrifuges, high-speed refrigerated centrifuges, and dual-purpose ultracentrifugal analytical and preparative refrigerated centrifuges, among others.

　　Taking low-speed refrigerated centrifuges and high-speed refrigerated centrifuges as examples, let’s discuss the differences between the two:

　　Low-speed refrigerated centrifuge

　　The rotational speed generally does not exceed 10,000 rpm. This type of centrifuge is most commonly used in laboratories for the large-scale primary separation and extraction of biomacromolecules, precipitates, and other substances. The rotor heads are typically made of aluminum alloy and come in two main types: swinging-bucket and angle-type. Centrifuge tubes are available in various models, including hard glass, rigid polyethylene plastic, and stainless steel. The centrifuge is equipped with a drive motor, timer, adjuster (for speed indication), and a refrigeration system (with an adjustable temperature range from -20°C to +40°C). Depending on the requirements of the centrifuged material, rotors of different capacities and speeds can be easily exchanged.

　　High-speed refrigerated centrifuge

　　The rotational speed can reach over 20,000 rpm. In addition to possessing the performance and structure of low-speed refrigerated centrifuges, the angle rotors used in high-speed centrifuges are all made from titanium alloy and aluminum alloy. The centrifuge tubes are rigid polyethylene plastic products with caps. These centrifuges are commonly used for collecting microorganisms, cell debris, cells, large organelles, sulfate precipitates, and immunoprecipitates, among other materials.

　　In summary, the rotational speed determines the differences in the rotor, and thus the substances being separated also differ.

　　So, if you’re looking to buy a refrigerated centrifuge that’s right for you, you’ll still need to do plenty of research and thoroughly understand your own requirements for separating substances in order to find the right refrigerated centrifuge for your needs.