(1) Speed:

Centrifuges are divided into low-speed centrifuges (<10000rpm/min) and high-speed centrifuges (10000rpm/min-30,00000rpm/min) depending on the maximum speed.

Ultra-high speed centrifuge (>30000rpm/min), each centrifuge has a rated maximum speed, and the maximum speed refers to the speed under no-load conditions.

However, the maximum speed varies depending on the type of rotor and the quality of the sample.

For example, the rated speed of a centrifuge is 16000 rpm/min, which means that the rotor rotates 16,000 times per minute at no load. After adding the sample, the speed will definitely be less than 16000 rpm/min.

The rotor is different, the maximum speed is different (one imported centrifuge can be equipped with multiple rotors), the horizontal rotor can reach 5000rpm/min, but the angle rotor can reach 14000rpm/min.

The specific difference should be consulted in detail about the product sales personnel and the relevant technical personnel of the production plant, so the choice of the speed should be cautious, the maximum speed of the selected centrifuge should be higher than the target speed.

For example, the target speed is 16000 rpm/mIn, and the maximum speed of the selected centrifuge must be higher than 16000 rpm/min.

(2) Temperature:

Some samples (such as proteins, cells, etc.) will be destroyed in high temperature environment, which is to choose a refrigerated centrifuge, which has a rated temperature range.

The heat generated by the centrifuge at high speed is balanced with the refrigeration system of the centrifuge at a certain temperature (the sample for general freeze centrifugation needs to be kept at 3 ° C ~ 8 ° C).

The specific amount can be related to the rotor. For example, a centrifuge can be rated at -10 °C to 60 °C, and the horizontal rotor can be rotated to about 3 °C.

If it is an angular rotor, it may only be around 7 °C. This should also be consulted in detail about the product sales staff and the relevant technical personnel of the production plant.

(3) Capacity:

How many sample tubes need to be centrifuged each time, and how much capacity each sample tube requires. These factors determine the total capacity of a centrifuge.

Simply speaking, the total capacity of the centrifuge = the capacity of each centrifuge tube × the number of centrifuge tubes, the total capacity and the amount of work are matched.

(4) Rotor:

The rotor of the centrifuge is mainly divided into two types.

Horizontal rotor: The running blue is in a horizontal state during operation, at right angles to the rotating shaft, and the sample concentrates the sediment on the bottom of the centrifuge tube;

Angular rotor: The centrifuge vessel is at a fixed angle to the shaft, and the sample concentrates the sediment on the bottom of the centrifuge tube and the side wall near the bottom.

If you want the separated sample to be concentrated at the bottom of the centrifuge tube, select the horizontal rotor. If you want the sample to concentrate on the bottom of the centrifuge tube and the side wall near the bottom, select the angle rotor.

There are also special tests or special samples that require special rotors such as large-capacity baskets (used for blood stations), ELISA plate rotors, slide rotors, PCR rotors, test tube rotors, and capillary rotors.

The rotor has a fixed size, which is combined with the capacity of the centrifuge, such as the 36 × 5ml angle rotor, which determines the type of rotor and determines the capacity of the centrifuge, so the choice of the rotor is very important.

(5) Control system:

High-end centrifuges use a microcomputer control system that not only ensures safe operation of the centrifuge but also automates tasks.

Now many centrifuges have a better humanized control system. For example: rotor identification function, safety lock function, fault prompt function, acceleration and deceleration curves, and so on.

In addition to the above points, pay attention to some details and necessary accessories.

The main component of the centrifuge is the motor. The motor is divided into a carbon brush motor and a carbonless brush motor. The former has been eliminated. Most of the current centrifuges are brushless motors, and some motors also have a brake function. Refrigerated centrifuges also differ in terms of refrigeration, and now environmentally friendly technologies are of course fluorine-free refrigeration.

In addition to this, consider the noise problem and try to choose a quieter centrifuge to maintain a comfortable experimental environment.

Care should be taken in the accessories. In some experiments, special centrifuge tubes (centrifugal toxic samples or samples requiring ultra-high-speed centrifugation) should be used. Such centrifuge tubes must be equipped with corresponding sleeves for safety.

There are also some special sample containers (irregular vials, blood bags, etc.). These details and accessories must be carefully considered when selecting a centrifuge, otherwise normal operation will not be possible.

The second is the price of the centrifuge. The domestic centrifuge and the imported centrifuge are very different. The centrifuge of the same function is about 3 times domestically produced.

There are also differences in the price of domestically-grade centrifuges, which are mainly distinguished by product performance and material selection. Also related to the manufacturer's research and development strength.

In terms of performance, centrifuges with refrigeration are much more expensive than normal, and the more control programs and functions, the higher the price of the centrifuge.

The difference is the configuration aspect, sometimes the price of the attachment will be higher than the price of the host.

When purchasing, be careful to select the rotor (quantity and type) in addition to the main unit, plus the necessary centrifuge tubes, sleeves, special centrifuge bottles or blood bags. For more information, please visit

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