You’re looking to buy a laboratory centrifuge. How do you know which one is right for you?

1 Type of centrifuge

There are different types of centrifuges depending on the design, capacity, and speed of the rotor. The most common ones are microcentrifuges, benchtop centrifuges, and floor-standing centrifuges. Microcentrifuges are small and compact, and can hold up to 24 tubes of 1.5 or 2 ml. Benchtop centrifuges are larger and more versatile, and can accommodate various sizes and shapes of tubes, plates, or bottles. Floor-standing centrifuges are the most powerful and expensive, and can handle high volumes and speeds of up to 100,000 rpm. You should choose the type of centrifuge that suits your sample size, throughput, and space requirements.

2 Speed and g-force

The speed of a centrifuge is measured in revolutions per minute (rpm), which indicates how fast the rotor spins. The g-force or relative centrifugal force (RCF) is the force exerted on the sample by the spinning motion. The RCF depends on both the speed and the radius of the rotor, and is usually expressed in multiples of the earth's gravity (g). The higher the RCF, the faster and more efficient the separation process. You should look for a centrifuge that can achieve the desired RCF for your application, and that has a variable speed control and a digital display.

3 Temperature and noise

The temperature and noise of a centrifuge are important factors for the quality and safety of your samples and your work environment. The temperature of a centrifuge can affect the stability and integrity of some sensitive samples, such as biological or chemical substances. Some centrifuges have a refrigeration system that can maintain a constant temperature or cool down the samples before or during the run. The noise of a centrifuge can be annoying and distracting, especially if you work in a small or shared space. Some centrifuges have a noise reduction feature that can lower the sound level or dampen the vibrations. You should check the temperature and noise specifications of the centrifuge and compare them with your sample and laboratory conditions.

4 Safety and maintenance

The safety and maintenance of a centrifuge are essential for preventing accidents and prolonging the lifespan of the device. A centrifuge can be hazardous if not used properly, as it can generate high forces, heat, and noise that can damage the samples, the rotor, or the user. Some centrifuges have safety features that can prevent or minimize the risks, such as a lid lock, an imbalance detection, a rotor recognition, or an emergency stop. The maintenance of a centrifuge involves regular cleaning, lubrication, inspection, and calibration of the parts, especially the rotor and the tubes. Some centrifuges have maintenance indicators that can alert you when a service is due. You should follow the manufacturer's instructions and recommendations for the safe and proper use and care of the centrifuge.

5 Cost and warranty

The cost and warranty of a centrifuge are the final factors to consider before you buy. The cost of a centrifuge depends on the type, size, speed, features, and quality of the device. You should compare the prices and benefits of different models and brands, and look for discounts or deals that can save you money. The warranty of a centrifuge is the guarantee that the manufacturer offers for the repair or replacement of the device in case of defects or malfunctions. You should check the warranty terms and conditions, and the availability and accessibility of the customer service and support. You should choose a centrifuge that fits your budget and offers a reliable and satisfactory warranty.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?