When purchasing a centrifuge, it’s important to understand it from multiple perspectives.

　　 Centrifuge The unit of rotational speed—whether in minutes or seconds—depends on whether the measurement follows the International System of Units or China’s legal metrological units. If it follows the International System of Units, the unit is seconds; if it follows China’s legal metrological units, the unit is minutes. A centrifuge is a mechanical device that uses centrifugal force to separate the components of a mixture consisting of liquids and solid particles or of two immiscible liquids.

　　Currently, centrifuges on the market can generally be classified into the following types based on their rotational speed:

　　Ordinary centrifuge (Low speed) <8000 rpm;

　　High-speed centrifuge 8,000 to 30,000 r/rain;

　　Ultracentrifuge 30,000 to 80,000 rpm;

　　Ultra-high-speed centrifuge >80,000 rpm.

　　Typically, medical centrifuges are low-speed centrifuges, with rotational speeds generally not exceeding. At 5,000 rpm, a horizontal rotor will suffice and can meet the requirements for high-capacity applications. For centrifuges used in laboratories at schools, research institutions, and other similar settings, high-speed centrifuges (above 5,000 rpm) are typically required, equipped with small-capacity angle rotors.

　　When selecting a centrifuge, laboratories can choose models with different capacities, speeds, and temperature controls based on the experimental purpose and requirements.

　　Regardless of the centrifuge manufacturer, since the separation principle of centrifuges is the same, the differences in the products processed by centrifuges are not significant.

　　To judge the quality of a centrifuge, one must pay attention to whether its manufacturing is precise (which can be verified by various technical drawings), whether it operates stably (which can be demonstrated by its track record), whether it meets safety requirements for production (such as corrosion resistance and explosion-proof features), whether it avoids environmental pollution (through measures like enclosure and exhaust gas treatment), and whether it satisfies the requirements of qualification reviews (reviews that must be passed before a product can be launched on the market).

　　The first step in selecting a centrifuge is, of course, the price—making sure it fits within your budget—as well as the delivery time. The second step is to conduct trials to see which model of centrifuge works best for your product (e.g., product recovery rate). The third step involves assessing whether the centrifuge’s installation on the production line is reasonable—in terms of height, width, safety, and environmental impact. The fourth step is to check whether the manufacturer can provide the necessary documentation required for the audit (since production can only proceed after passing the audit). The fifth step is to evaluate the after-sales service—including routine maintenance, scheduled repairs, and troubleshooting of any malfunctions.

　　For centrifuge maintenance, pay close attention on a daily basis. Before a failure occurs, check whether the machine shows any abnormalities and whether there are any unusual odors emanating from inside the machine. (such as the smell of burnt wires), whether similar phenomena have occurred in the past, the last time the failure happened, and whether any violations of operating procedures took place during machine operation. Check whether the equipment’s exterior is intact, whether there are signs of burning or water damage on the casing, and whether the machine’s casing has been subjected to violent impact. Also verify that the power cord is undamaged and that the grounding connection is sound. Open the equipment’s casing and carefully inspect the interior of the machine. Conduct a comprehensive, systematic examination of the machine, following a sequence that starts with the easier components before moving on to the more complex ones, first checking external parts before delving into internal components, and employing a process of elimination—gradually ruling out good components one by one to progressively isolate the faulty parts.

　　The factors influencing centrifugal force include the inner cavity diameter, rotor size and weight, and capacity. Therefore, centrifugal forces vary among different centrifuges; if the centrifugal forces are the same, there won't be much difference.

　　Finally, it’s worth noting the centrifugal efficiency. During procurement, testing should be conducted strictly according to the requirements specified at the time of purchase. If the supplier provides specific parameters when you’re purchasing the centrifuge, you can directly assess the machine’s performance by examining these operational parameters. If your goal is to achieve a particular product outcome, after running the centrifuge, evaluate the results and then adjust various parameters—such as rotational speed and centrifugation time—to determine which settings yield results that closely meet your requirements.